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Screw-in forces during instrumentation by various file systems
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Jung-Hong Ha, Sang Won Kwak, Sung-Kyo Kim, Hyeon-Cheol Kim
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Restor Dent Endod 2016;41(4):304-309. Published online November 8, 2016
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DOI: https://doi.org/10.5395/rde.2016.41.4.304
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Abstract
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- Objectives
The purpose of this study was to compare the maximum screw-in forces generated during the movement of various Nickel-Titanium (NiTi) file systems. Materials and MethodsForty simulated canals in resin blocks were randomly divided into 4 groups for the following instruments: Mtwo size 25/0.07 (MTW, VDW GmbH), Reciproc R25 (RPR, VDW GmbH), ProTaper Universal F2 (PTU, Dentsply Maillefer), and ProTaper Next X2 (PTN, Dentsply Maillefer, n = 10). All the artificial canals were prepared to obtain a standardized lumen by using ProTaper Universal F1. Screw-in forces were measured using a custom-made experimental device (AEndoS-k, DMJ system) during instrumentation with each NiTi file system using the designated movement. The rotation speed was set at 350 rpm with an automatic 4 mm pecking motion at a speed of 1 mm/sec. The pecking depth was increased by 1 mm for each pecking motion until the file reach the working length. Forces were recorded during file movement, and the maximum force was extracted from the data. Maximum screw-in forces were analyzed by one-way ANOVA and Tukey's post hoc comparison at a significance level of 95%. ResultsReciproc and ProTaper Universal files generated the highest maximum screw-in forces among all the instruments while M-two and ProTaper Next showed the lowest (p < 0.05). ConclusionsGeometrical differences rather than shaping motion and alloys may affect the screw-in force during canal instrumentation. To reduce screw-in forces, the use of NiTi files with smaller cross-sectional area for higher flexibility is recommended.
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Citations
Citations to this article as recorded by 
- Comparison of mechanical properties and shaping performance of ProGlider and ProTaper ultimate slider
Jeyi Song, Ji-Hyun Jang, Seok Woo Chang, Shin Hye Chung, Soram Oh BMC Oral Health.2025;[Epub] CrossRef - Screw-in force, torque generation, and performance of glide-path files with three rotation kinetics
Jee-Yeon Woo, Ji-Hyun Jang, Seok Woo Chang, Soram Oh Odontology.2024; 112(3): 761. CrossRef - Comparative evaluation of stress distribution against the root canal wall at three different levels using novel NiTi rotary files – A finite element analysis
Rimjhim Singh, Sandeep Dubey, Palak Singh, Praveen Singh Samant, Suparna Ganguly Saha Journal of Conservative Dentistry and Endodontics.2024; 27(1): 62. CrossRef - Restoration of teeth lacking complete ferrules using cast precious metal alloy post-and-cores and knife-edged crowns: A retrospective clinical study
Fangyue Xiang, Keying Shi, Haoyang Hua, Jing Zhao, Yuanna Zheng The Journal of Prosthetic Dentistry.2024;[Epub] CrossRef - Effect of Periodic Changes in Rotation Speed on Torsional Stress and Screw-in Force by Alternative Rotation Technique
Jung-Hong Ha, Hyo-Jin Jo, Sang Won Kwak, Asgeir Sigurdsson, Hyeon-Cheol Kim Journal of Endodontics.2023; 49(1): 77. CrossRef - A Comparative Evaluation of the Apically Extruded Debris from Root Canals Prepared by R-Motion NiTi File System
Farah B. Al-Saffar, Hikmet A. Al-Gharrawi, Luca Testarelli International Journal of Dentistry.2023; 2023: 1. CrossRef - Effect of Rotational Modes on Torque/Force Generation and Canal Centering Ability during Rotary Root Canal Instrumentation with Differently Heat-Treated Nickel–Titanium Instruments
Satoshi Omori, Arata Ebihara, Keiko Hirano, Yuka Kasuga, Hayate Unno, Taro Nakatsukasa, Shunsuke Kimura, Keiichiro Maki, Takao Hanawa, Takashi Okiji Materials.2022; 15(19): 6850. CrossRef - Effect of Core Mass and Alloy on Cyclic Fatigue Resistance of Different Nickel-Titanium Endodontic Instruments in Matching Artificial Canals
Sebastian Bürklein, Lennart Zupanc, David Donnermeyer, Karsten Tegtmeyer, Edgar Schäfer Materials.2021; 14(19): 5734. CrossRef - Comparison of Torque, Screw-in Force, and Shaping Ability of Glide Path Instruments in Continuous Rotation and Optimum Glide Path Motion
Pyae Hein Htun, Arata Ebihara, Keiichiro Maki, Shunsuke Kimura, Miki Nishijo, Moe Sandar Kyaw, Takashi Okiji Journal of Endodontics.2021; 47(1): 94. CrossRef - Analysis of Torque and Force Induced by Rotary Nickel-Titanium Instruments during Root Canal Preparation: A Systematic Review
Myint Thu, Arata Ebihara, Sherif Adel, Takashi Okiji Applied Sciences.2021; 11(7): 3079. CrossRef - Influence of rotational speed on torque/force generation and shaping ability during root canal instrumentation of extracted teeth with continuous rotation and optimum torque reverse motion
M. S. Kyaw, A. Ebihara, Y. Kasuga, K. Maki, S. Kimura, P. H. Htun, T. Nakatsukasa, T. Okiji International Endodontic Journal.2021; 54(9): 1614. CrossRef - Effect of Optimum Torque Reverse Motion on Torque and Force Generation during Root Canal Instrumentation with Crown-down and Single-length Techniques
Shunsuke Kimura, Arata Ebihara, Keiichiro Maki, Miki Nishijo, Daisuke Tokita, Takashi Okiji Journal of Endodontics.2020; 46(2): 232. CrossRef - Comparative analysis of torque and apical force to assess the cutting behaviour of ProTaper Next and ProTaper Universal endodontic instruments
Gustavo de Cristofaro Almeida, Diego Pinheiro Aun, Pedro Damas Resende, Isabella Faria da Cunha Peixoto, Ana Cecília Diniz Viana, Vicente Tadeu Lopes Buono, Maria Guiomar de Azevedo Bahia Australian Endodontic Journal.2020; 46(1): 52. CrossRef - Enhanced root canal-centering ability and reduced screw-in force generation of reciprocating nickel-titanium instruments with a post-machining thermal treatment
Keiichiro MAKI, Arata EBIHARA, Shunsuke KIMURA, Miki NISHIJO, Daisuke TOKITA, Kana MIYARA, Takashi OKIJI Dental Materials Journal.2020; 39(2): 251. CrossRef - Ex-Vivo Comparison of Torsional Stress on Nickel–Titanium Instruments Activated by Continuous Rotation or Adaptive Motion
Joo Yeong Lee, Sang Won Kwak, Jung-Hong Ha, Hyeon-Cheol Kim Materials.2020; 13(8): 1900. CrossRef - Evaluation of stress distribution in nickel-titanium rotary instruments with different geometrical designs subjected to bending and torsional load: a finite element study
Manar Galal, Tamer M. Hamdy Bulletin of the National Research Centre.2020;[Epub] CrossRef - Assessment of mechanical properties of WaveOne Gold Primary reciprocating instruments
Tong FANGLI, Keiichiro MAKI, Shunsuke KIMURA, Miki NISHIJO, Daisuke TOKITA, Arata EBIHARA, Takashi OKIJI Dental Materials Journal.2019; 38(3): 490. CrossRef - Comparison of Screw-In Forces during Movement of Endodontic Files with Different Geometries, Alloys, and Kinetics
Sang Won Kwak, Chan-Joo Lee, Sung Kyo Kim, Hyeon-Cheol Kim, Jung-Hong Ha Materials.2019; 12(9): 1506. CrossRef - Gripping the Gripped: Removal of Foreign Bodies from Root Canal System
Shweta Jain, Sachin Jain, Shikha Jain, Sophia Thakur Dental Research and Management.2019; : 13. CrossRef - Mechanical Properties of Orifice Preflaring Nickel-titanium Rotary Instrument Heat Treated Using T-Wire Technology
Maamoun Ataya, Jung-Hong Ha, Sang Won Kwak, Ibrahim H. Abu-Tahun, Rashid El Abed, Hyeon-Cheol Kim Journal of Endodontics.2018; 44(12): 1867. CrossRef - How biomechanics can affect the endodontic treated teeth and their restorative procedures?
Carlos José Soares, Monise de Paula Rodrigues, André Luis Faria-e-Silva, Paulo Cesar Freitas Santos-Filho, Crisnicaw Veríssimo, Hyeon-Cheol Kim, Antheunis Versluis Brazilian Oral Research.2018;[Epub] CrossRef - Evaluation of selected mechanical properties of NiTi rotary glide path files manufactured from controlled memory wires
Miki NISHIJO, Arata EBIHARA, Daisuke TOKITA, Hisashi DOI, Takao HANAWA, Takashi OKIJI Dental Materials Journal.2018; 37(4): 549. CrossRef - Nickel–titanium instruments in endodontics: a concise review of the state of the art
Giulio Gavini, Marcelo dos Santos, Celso Luis Caldeira, Manoel Eduardo de Lima Machado, Laila Gonzales Freire, Elaine Faga Iglecias, Ove Andrea Peters, George Táccio de Miranda Candeiro Brazilian Oral Research.2018;[Epub] CrossRef - Dynamic Torque and Vertical Force Analysis during Nickel-titanium Rotary Root Canal Preparation with Different Modes of Reciprocal Rotation
Daisuke Tokita, Arata Ebihara, Miki Nishijo, Kana Miyara, Takashi Okiji Journal of Endodontics.2017; 43(10): 1706. CrossRef
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Esthetic enhancement of a traumatized anterior tooth with a combination of forced eruption and tooth alignment: a case report
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So-Hee Kang, Jung-Hong Ha, Myoung-Uk Jin, Sung-Kyo Kim, Young-Kyung Kim
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Restor Dent Endod 2016;41(3):210-217. Published online June 1, 2016
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DOI: https://doi.org/10.5395/rde.2016.41.3.210
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Exposing sound structure of a subgingivally fractured tooth using orthodontic extrusion is considered to be a conservative way to re-establish biologic width without sacrificing esthetics or jeopardizing periodontal support of neighboring teeth. When a misaligned tooth is traumatically involved, a more comprehensive approach combining tooth extrusion and re-alignment may be necessary for a successful restorative outcome. This case report describes a successful esthetic management of a patient with complicated crown-root fracture on the maxillary right central incisor and pre-existing malocclusion in the maxillary anterior region. Forced eruption along with re-alignment of teeth by orthodontic movement seems to allow re-positioning of the fracture line to a favorable position and correction of crowding, providing a better esthetic result.
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Citations
Citations to this article as recorded by 
- Effects of systematic bisphosphonate use in patients under orthodontic treatment: a systematic review
Vasileios F Zymperdikas, Maria P Yavropoulou, Eleftherios G Kaklamanos, Moschos A Papadopoulos European Journal of Orthodontics.2020; 42(1): 60. CrossRef - In vitro retention efficiency of temporary type zinc oxide cement for orthodontic forced eruption
Renato Nieto-Aguilar, Deyanira Serrato-Ochoa, Rafael Medina-Navarro, Asdrúbal Aguilera-Méndez, Karina Denisse Morales-Soto, Juan Pablo Loyola-Rodriguez, Antonio Campos, Miguel Alaminos International Orthodontics.2019; 17(1): 96. CrossRef
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Effect of repetitive pecking at working length for glide path preparation using G-file
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Jung-Hong Ha, Hyo-Jin Jeon, Rashid El Abed, Seok-Woo Chang, Sung-Kyo Kim, Hyeon-Cheol Kim
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Restor Dent Endod 2015;40(2):123-127. Published online January 7, 2015
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DOI: https://doi.org/10.5395/rde.2015.40.2.123
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Abstract
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Glide path preparation is recommended to reduce torsional failure of nickel-titanium (NiTi) rotary instruments and to prevent root canal transportation. This study evaluated whether the repetitive insertions of G-files to the working length maintain the apical size as well as provide sufficient lumen as a glide path for subsequent instrumentation. Materials and MethodsThe G-file system (Micro-Mega) composed of G1 and G2 files for glide path preparation was used with the J-shaped, simulated resin canals. After inserting a G1 file twice, a G2 file was inserted to the working length 1, 4, 7, or 10 times for four each experimental group, respectively (n = 10). Then the canals were cleaned by copious irrigation, and lubricated with a separating gel medium. Canal replicas were made using silicone impression material, and the diameter of the replicas was measured at working length (D0) and 1 mm level (D1) under a scanning electron microscope. Data was analysed by one-way ANOVA and post-hoc tests (p = 0.05). ResultsThe diameter at D0 level did not show any significant difference between the 1, 2, 4, and 10 times of repetitive pecking insertions of G2 files at working length. However, 10 times of pecking motion with G2 file resulted in significantly larger canal diameter at D1 (p < 0.05). ConclusionsUnder the limitations of this study, the repetitive insertion of a G2 file up to 10 times at working length created an adequate lumen for subsequent apical shaping with other rotary files bigger than International Organization for Standardization (ISO) size 20, without apical transportation at D0 level.
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Citations
Citations to this article as recorded by 
- Glide Path – An Ineluctable Route for Successful Endodontic Mechanics: A Literature Review
Mahima Bharat Mehta, Anupam Sharma, Aniket Jadhav, Aishwarya Handa, Abhijit Bajirao Jadhav, Ashwini A. Narayanan Journal of the International Clinical Dental Research Organization.2024; 16(2): 101. CrossRef - Effect of repetitive up-and-down movements on torque/force generation, surface defects and shaping ability of nickel-titanium rotary instruments: an ex vivo study
Moe Sandar Kyaw, Arata Ebihara, Yoshiko Iino, Myint Thu, Keiichiro Maki, Shunsuke Kimura, Pyae Hein Htun, Takashi Okiji BMC Oral Health.2024;[Epub] CrossRef - Influence of the Number of Pecking Motions at Working Length on the Shaping Ability of Single-file Systems in Long Oval-shaped Curved Canals
Lixiao Wang, Ruitian Lin, Hui Chen, Zihan Li, Franklin R. Tay, Lisha Gu Journal of Endodontics.2022; 48(4): 548. CrossRef - Influence of pecking frequency at working length on the volume of apically extruded debris: A micro-computed tomography analysis
Li-Xiao Wang, Hui Chen, Rui-Tian Lin, Li-Sha Gu Journal of Dental Sciences.2022; 17(3): 1274. CrossRef - Comparison of the effects from coronal pre‐flaring and glide‐path preparation on torque generation during root canal shaping procedure
Sang Won Kwak, Jung‐Hong Ha, Ya Shen, Markus Haapasalo, Hyeon‐Cheol Kim Australian Endodontic Journal.2022; 48(1): 131. CrossRef - Effective Establishment of Glide-Path to Reduce Torsional Stress during Nickel-Titanium Rotary Instrumentation
Ibrahim H. Abu-Tahun, Sang Won Kwak, Jung-Hong Ha, Asgeir Sigurdsson, Mehmet Baybora Kayahan, Hyeon-Cheol Kim Materials.2019; 12(3): 493. CrossRef - Stress Generation during Pecking Motion of Rotary Nickel-titanium Instruments with Different Pecking Depth
Jung-Hong Ha, Sang Won Kwak, Asgeir Sigurdsson, Seok Woo Chang, Sung Kyo Kim, Hyeon-Cheol Kim Journal of Endodontics.2017; 43(10): 1688. CrossRef - Debris extrusion by glide-path establishing endodontic instruments with different geometries
Jung-Hong Ha, Sung Kyo Kim, Sang Won Kwak, Rashid El Abed, Yong Chul Bae, Hyeon-Cheol Kim Journal of Dental Sciences.2016; 11(2): 136. CrossRef - Effects of Pitch Length and Heat Treatment on the Mechanical Properties of the Glide Path Preparation Instruments
Sang Won Kwak, Jung-Hong Ha, Chan-Joo Lee, Rashid El Abed, Ibrahim H. Abu-Tahun, Hyeon-Cheol Kim Journal of Endodontics.2016; 42(5): 788. CrossRef
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Buckling resistance, bending stiffness, and torsional resistance of various instruments for canal exploration and glide path preparation
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Sang-Won Kwak, Jung-Hong Ha, WooCheol Lee, Sung-Kyo Kim, Hyeon-Cheol Kim
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Restor Dent Endod 2014;39(4):270-275. Published online July 16, 2014
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DOI: https://doi.org/10.5395/rde.2014.39.4.270
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Abstract
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This study compared the mechanical properties of various instruments for canal exploration and glide-path preparations. Materials and MethodsThe buckling resistance, bending stiffness, ultimate torsional strength, and fracture angle under torsional load were compared for C+ file (CP, Dentsply Maillefer), M access K-file (MA, Dentsply Maillefer), Mani K-file (MN, Mani), and NiTiFlex K-file (NT, Dentsply Maillefer). The files of ISO size #15 and a shaft length of 25 mm were selected. For measuring buckling resistance (n = 10), the files were loaded in the axial direction of the shaft, and the maximum load was measured during the files' deflection. The files (n = 10) were fixed at 3-mm from the tip and then bent 45° with respect to their long axis, while the bending force was recorded by a load cell. For measuring the torsional properties, the files (n = 10) were also fixed at 3-mm, and clockwise rotations (2-rpm) were applied to the files in a straight state. The torsional load and the distortion angle were recorded until the files succumbed to the torque. ResultsThe CP was shown to require the highest load to buckle and bend the files, and the NT showed the least. While MA and MN showed similar buckling resistances, MN showed higher bending stiffness than MA. The NT had the lowest bending stiffness and ultimate torsional strength (p < 0.05). ConclusionsThe tested instruments showed different mechanical properties depending on the evaluated parameters. CP and NT files were revealed to be the stiffest and the most flexible instruments, respectively.
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Citations
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- Comparison of torsional, bending, and buckling resistances of different nickel-titanium glide path files
Feyyaz Çeliker, İrem Çetinkaya Matéria (Rio de Janeiro).2024;[Epub] CrossRef - Comparative Analysis of Endodontic 0.15 Stainless-Steel K-Files: Exploring Design, Composition, and Mechanical Performance
Abayomi Omokeji Baruwa, Filipa Chasqueira, Sofia Arantes-Oliveira, João Caramês, Duarte Marques, Jaime Portugal, Jorge N. R. Martins Dentistry Journal.2024; 12(2): 29. CrossRef - Comparative Analysis of Endodontic ISO Size 06, 08, and 10 Stainless Steel K-Files Used for Glide Path Procedures
Abayomi Omokeji Baruwa, Filipa Chasqueira, Sofia Arantes-Oliveira, João Caramês, Duarte Marques, Jaime Portugal, Jorge N. R. Martins Dentistry Journal.2024; 12(4): 98. CrossRef - Glide Path in Endodontics: A Literature Review of Current Knowledge
Vlad Mircea Lup, Giulia Malvicini, Carlo Gaeta, Simone Grandini, Gabriela Ciavoi Dentistry Journal.2024; 12(8): 257. CrossRef - Shaping Ability and Buckling Resistance of TruNatomy, WaveOne gold, and XP-Endo Shaper Single-File Systems
Neveen Ali Shaheen, Nahla Gamal Eldin Elhelbawy Contemporary Clinical Dentistry.2022; 13(3): 261. CrossRef - A comparison of different hand and rotary endodontic glide path files for buckling resistance
Ruchika Gupta, Pramod Mohite, Suvarna Patil, Nandita Bansal Endodontology.2021; 33(2): 102. CrossRef - Buckling Resistance of Various Nickel-Titanium Glide Path Preparation Instruments in Dynamic or Static Mode
Jung-Hong Ha, Sang Won Kwak, Antheunis Versluis, Hyeon-Cheol Kim Journal of Endodontics.2020; 46(8): 1125. CrossRef - Influence of heat treatment on color and flexibility of nickel-titanium endodontic instruments
Bernardo Corrêa de ALMEIDA, Carlos Nelson ELIAS RGO - Revista Gaúcha de Odontologia.2020;[Epub] CrossRef - Influence of Negotiation, Glide Path, and Preflaring Procedures on Root Canal Shaping—Terminology, Basic Concepts, and a Systematic Review
Gianluca Plotino, Venkateshbabu Nagendrababu, Frederic Bukiet, Nicola M. Grande, Sajesh K. Veettil, Gustavo De-Deus, Hany Mohamed Aly Ahmed Journal of Endodontics.2020; 46(6): 707. CrossRef - Mechanical Properties of Various Heat-treated Nickel-titanium Rotary Instruments
Hye-Jin Goo, Sang Won Kwak, Jung-Hong Ha, Eugenio Pedullà, Hyeon-Cheol Kim Journal of Endodontics.2017; 43(11): 1872. CrossRef - Debris extrusion by glide-path establishing endodontic instruments with different geometries
Jung-Hong Ha, Sung Kyo Kim, Sang Won Kwak, Rashid El Abed, Yong Chul Bae, Hyeon-Cheol Kim Journal of Dental Sciences.2016; 11(2): 136. CrossRef
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Endodontic treatment of maxillary lateral incisors with anatomical variations
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Moon-Hwan Lee, Jung-Hong Ha, Myoung-Uk Jin, Young-Kyung Kim, Sung-Kyo Kim
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Restor Dent Endod 2013;38(4):253-257. Published online November 12, 2013
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DOI: https://doi.org/10.5395/rde.2013.38.4.253
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Maxillary lateral incisors usually exhibit a single root with a single canal. However, maxillary lateral incisor teeth with unusual morphology of root canal system are frequently reported. These cases of variable root canal anatomy can be treated well by nonsurgical endodontic methods. A detailed description of root canal morphology is fundamental for successful endodontic treatment. Treatment using an operating microscope, radiographs from different angles, and cone-beam computerized tomography (CBCT) can produce more predictable endodontic outcomes.
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- Endodnontic Management of a Maxillary Lateral Incisor with Two Roots
Pujan Kranti Kayastha, Merina Shakya, Laxman Poudel Journal of Interdisciplinary Dentistry.2022; 12(1): 32. CrossRef - Non-surgical management of dens invaginatus type IIIB in maxillary lateral incisor with three root canals and 6-year follow-up: A case report and review of literature
Suraj Arora, Gurdeep Singh Gill, Shahabe Abullais Saquib, Priyanka Saluja, Suheel M Baba, Shafait Ullah Khateeb, Anshad M Abdulla, Shashit Shetty Bavabeedu, Ahmed Babiker Mohamed Ali, Mohamed Fadul A Elagib World Journal of Clinical Cases.2022; 10(33): 12240. CrossRef - Endodontic management and follow-up of two rooted maxillary lateral incisor with open apex – A case report
R AnithaKumari, Sneha Jeetendra, Siddharth Rai, Sudhanva Eregowda IP Indian Journal of Conservative and Endodontics.2020; 5(4): 200. CrossRef - Geminated Maxillary Lateral Incisor with Two Root Canals
Nayara Romano, Luis Eduardo Souza-Flamini, Isabela Lima Mendonça, Ricardo Gariba Silva, Antonio Miranda Cruz-Filho Case Reports in Dentistry.2016; 2016: 1. CrossRef - Surgical management with intentional replantation on a tooth with palato-radicular groove
Jorge Forero-López, Luis Gamboa-Martínez, Laura Pico-Porras, Javier Laureano Niño-Barrera Restorative Dentistry & Endodontics.2015; 40(2): 166. CrossRef - Use of cone-beam computed tomography and three-dimensional modeling for assessment of anomalous pulp canal configuration: a case report
Alper Sinanoglu, Dilek Helvacioglu-Yigit, Ibrahim Mutlu Restorative Dentistry & Endodontics.2015; 40(2): 161. CrossRef - Endodontic management of a mandibular second molar with radix entomolaris: a case report
Rosaline Hannah, Deivanayagam Kandaswamy, Nachimuthu Jayaprakash Restorative Dentistry & Endodontics.2014; 39(2): 132. CrossRef
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Diastema closure using direct bonding restorations combined with orthodontic treatment: a case report
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Soon-Kong Hwang, Jung-Hong Ha, Myoung-Uk Jin, Sung-Kyo Kim, Young-Kyung Kim
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Restor Dent Endod 2012;37(3):165-169. Published online August 29, 2012
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DOI: https://doi.org/10.5395/rde.2012.37.3.165
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Closure of interdental spaces using proximal build-ups with resin composite is considered to be practical and conservative. However, a comprehensive approach combining two or more treatment modalities may be needed to improve esthetics. This case report describes the management of a patient with multiple diastemas, a peg-shaped lateral incisor and midline deviation in the maxillary anterior area. Direct resin bonding along with orthodontic movement of teeth allows space closure and midline correction, consequently, creating a better esthetic result.
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B Mueller, GB Rauber, LA Linhares, JK Bernardon, E Santini, LF Pottmaier Operative Dentistry.2023; 48(3): 237. CrossRef - Effectiveness, longevity, and color stability of in-office bleaching (6% H2O2 gel/Violet LED) and diastema closure with direct composite: 3-year follow-up
Ikejiri Larissa Luri Almeida Amorim, Álamo Larissa , Galli Mateus Zamora , Bombonatti Juliana Fraga Soares , de Amoêdo Campos Velo Marilia Mattar , Mondelli Rafael Francisco Lia Journal of Clinical Advances in Dentistry.2023; 7(1): 001. CrossRef - Ortodontik Tedavi Bitiminden Sonra Polidiastemanın Kompozit Rezin Ile Rehabilitasyonu: Olgu Sunumu
Rümeysa BATTAL, Hacer Deniz ARISU Selcuk Dental Journal.2022; 9(4): 127. CrossRef - Multidisciplinary Approach to Treatment of Midline Diastema With Edge-to-Edge Bite
Sumukh Nerurkar, Ranjit Kamble, Japneet Kaiser, Jeni Mathew Cureus.2022;[Epub] CrossRef - ÜST ANTERİOR DİŞLERDE BULUNAN ÇÜRÜKLERİN VE ESKİ RESTORASYONLARIN KOMPOZİT REZİNLER İLE ESTETİĞİNİN SAĞLANMASI: BİR VAKA SUNUMU
Abdulkadir HARMANKAYA, Hakan Yasin GÖNDER Selcuk Dental Journal.2022; 9(4): 86. CrossRef - ANTERİOR DİASTEMALARIN DİREKT KOMPOZİT REZİN RESTORASYONLARLA ESTETİK REHABİLİTASYONU: 5 OLGU SUNUMU
Handan YILDIRIM, Esra ÖZYURT Selcuk Dental Journal.2020; 7(2): 334. CrossRef - VAKUMLA ŞEKİLLENDİRİLEN ORTODONTİK PEKİŞTİRME APAREYLERİNİN KOMPOZİT RESTORASYONLARIN KLİNİK BAŞARISINA ETKİSİ
Serdar AKARSU, Sultan AKTUĞ KARADEMİR, Süleyman Kutalmış BÜYÜK Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi.2020; : 1. CrossRef - Aesthetic Smile Coming with Direct Composite Resin Laminate Restorations: Two Case Reports
Funda Demir, Elif Aybala Oktay, Numan Aydın, Fulya Toksoy Topçu, Ertürk Bilgeç Ankara Medical Journal.2018;[Epub] CrossRef - Effects of Different Demineralization‐Inhibiting Methods on the Shear Bond Strength of Glass‐Ceramics
Erhan Dilber, Mehmet Akın, Tevfik Yavuz, Ali Erdem Journal of Prosthodontics.2015; 24(5): 407. CrossRef - Correction of Mandibular Prognathism in Combination with Polydiastema Using Rectangular Body Ostectomy: Literature Review and Case Report
Metin Sencimen, Abdullah Tugrul Coskun, Gurkan Rasit Bayar, Handan Altug, Hasan Ayberk Altug, Tamer Zerener Case Reports in Clinical Medicine.2014; 03(11): 601. CrossRef - Predictable interproximal tissue removal with a surgical stent
Fausto Frizzera, Suzane Cristina Pigossi, Mateus Rodrigues Tonetto, William Kabbach, Elcio Marcantonio The Journal of Prosthetic Dentistry.2014; 112(4): 727. CrossRef
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Diagnostic challenges of nonodontogenic toothache
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Hyung-Ok Park, Jung-Hong Ha, Myoung-Uk Jin, Young-Kyung Kim, Sung-Kyo Kim
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Restor Dent Endod 2012;37(3):170-174. Published online August 29, 2012
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DOI: https://doi.org/10.5395/rde.2012.37.3.170
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The objective of this article was to present two nonodontogenic conditions that may mimic odontogenic toothache: trigeminal neuralgia and burning mouth syndrome. Two cases are presented in which one is related to the upper left second premolar and the other is related to the upper left first molar. Both showed pain when chewing. These two cases highlight the complexities involved in diagnosing nonodontogenic toothache. This article demonstrates the importance of having a thorough knowledge of both odontogenic and nonodontogenic toothache, as well as the need for careful evaluation of the nature of the pain and history, clinical and radiographic examinations.
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Jeong Yeop Chun, Young Joo Shim Journal of Oral Medicine and Pain.2024; 49(3): 57. CrossRef - Interactions of Acetyl-11-Keto-Beta-Boswellic Acid on Catechol-O-Methyltransferase in the Management of Masticatory Myofascial Pain Syndrome
Ramya Suresh, Pradeep Kumar Yadalam, Ramya Ramadoss, Karthikeyan Ramalingam, Arvind Muthukrishnan Cureus.2024;[Epub] CrossRef - Assessment of Concordance between Chairside Ultrasonography and Digital Palpation in Detecting Myofascial Trigger Points in Masticatory Myofascial Pain Syndrome
Mohamed Elbarbary, Michael Goldberg, Howard C. Tenenbaum, David K. Lam, Bruce V. Freeman, David J. Pustaka, David Mock, Joseph Beyene, Amir Azarpazhooh Journal of Endodontics.2023; 49(2): 129. CrossRef - Masticatory Myofascial Pain Syndrome: Implications for Endodontists
Mohamed Elbarbary, Ariel Oren, Michael Goldberg, Bruce V. Freeman, David Mock, Howard C. Tenenbaum, Amir Azarpazhooh Journal of Endodontics.2022; 48(1): 55. CrossRef - PRICE 2020 guidelines for reporting case reports in Endodontics: explanation and elaboration
V. Nagendrababu, B. S. Chong, P. McCabe, P. K. Shah, E. Priya, J. Jayaraman, S. J. Pulikkotil, P. M. H. Dummer International Endodontic Journal.2020; 53(7): 922. CrossRef - Clinical Outline of Oral Diseases
Arvind Babu Rajendra Santosh, Doryck Boyd, Kumaraswamy Kikeri Laxminarayana Dental Clinics of North America.2020; 64(1): 1. CrossRef - Nonodontogenic Sources of Dental Pain
Scott E. Schames, Michael Jordan, Hila Robbins, Lenard Katz, Kaitlyn Tarbert Journal of the California Dental Association.2016; 44(8): 507. CrossRef - Nonodontogenic toothaches
Edward F. Wright The Journal of the American Dental Association.2015; 146(6): 406. CrossRef - Síndrome de boca ardiente: claves diagnósticas y terapéuticas
Eduardo Chimenos-Küstner, Cristina Arcos-Guerra, Maria Sueli Marques-Soares Medicina Clínica.2014; 142(8): 370. CrossRef
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Influence of taper on the screw-in effect of nickel-titanium rotary files in simulated resin root canal
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Hye-Jin Sung, Jung-Hong Ha, Sung-Kyo Kim
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J Korean Acad Conserv Dent 2010;35(5):380-386. Published online September 30, 2010
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DOI: https://doi.org/10.5395/JKACD.2010.35.5.380
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Abstract
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Objectives
The introduction of nickel-titanium alloy endodontic instruments has greatly simplified shaping the root canal systems. However, these new instruments have several unexpected disadvantages. One of these is tendency to screw into the canal. In this study, the influence of taper on the screw-in effect of the Ni-Ti rotary instrument were evaluated.
Materials and Methods
A total of 20 simulated root canals with an S-shaped curvature in clear resin blocks were divided into two groups. ProFile .02, .04, .06 (Dentsply-Maillefer) and GT rotary files .08, .10, .12 (Dentsply) were used in Profile group, and K3 .04, .06, .08, .10, and .12 (SybronEndo, Glendora) were used in K3 group. Files were used with a single pecking motion at a constant speed of 300 rpm. A special device was made to measure the force of screw-in effect. A dynamometer of the device recorded the screw-in force during simulated canal preparation and the recorded data was stored in computer with designed software. The data were subjected to one-way ANOVA and Tukey's multiple range test for post-hoc test. p value of less than 0.05 was regarded significant.
Results
The more tapered instruments generated more screw-in forces in Profile group (p < 0.05). In K3 group, 0.08, 0.10. and 0.12 tapered instruments showed more screw-in force than 0.04 tapered one, and 0.08 and 0.12 tapered instruments showed more screw-in force than 0.06 tapered one (p < 0.05).
Conclusions
The more tapered instruments seems to produce more screw-in force. To avoid this screw-in force during instrumentation, more attention may be needed when using more tapered instruments.
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Citations
Citations to this article as recorded by 
- Analysis of Torque and Force Induced by Rotary Nickel-Titanium Instruments during Root Canal Preparation: A Systematic Review
Myint Thu, Arata Ebihara, Sherif Adel, Takashi Okiji Applied Sciences.2021; 11(7): 3079. CrossRef - Comparative analysis of mechanical properties of differently tapered nickeltitanium endodontic rotary instruments
Yohei FUKUMORI, Miki NISHIJYO, Daisuke TOKITA, Kana MIYARA, Arata EBIHARA, Takashi OKIJI Dental Materials Journal.2018; 37(4): 667. CrossRef - Influence of glide path on the screw-in effect and torque of nickel-titanium rotary files in simulated resin root canals
Jung-Hong Ha, Sang-Shin Park Restorative Dentistry & Endodontics.2012; 37(4): 215. CrossRef - Mechanical and geometric features of endodontic instruments and its clinical effect
Hyeon-Cheol Kim Journal of Korean Academy of Conservative Dentistry.2011; 36(1): 1. CrossRef
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Comparison of screw-in effect for several nickel-titanium rotary instruments in simulated resin root canal
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Jung-Hong Ha, Myoung-Uk Jin, Young-Kyung Kim, Sung-Kyo Kim
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J Korean Acad Conserv Dent 2010;35(4):267-272. Published online July 31, 2010
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DOI: https://doi.org/10.5395/JKACD.2010.35.4.267
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Abstract
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Screw-in effect is one of the unintended phenomena that occurs during the root canal preparation with nickel-titanium rotary files. The aim of this study was to compare the screw-in effect among various nickel-titanium rotary file systems.
Six different nickel-titanium rotary instruments (ISO 20/.06 taper) were used: K3™ (SybronEndo, Glendora, CA, USA), Mtwo (VDW GmbH, München, Germany), NRT with safe-tip and with active tip (Mani Inc., Shioya-gun, Japan), ProFile® (Dentsply-Maillefer, Ballaigues, Switzerland) and ProTaper® (Dentsply-Maillefer, Ballaigues, Switzerland). For ProTaper®, S2 was selected because it has size 20. Root canal instrumentations were done in sixty simulated single-curved resin root canals with a rotational speed of 300 rpm and single pecking motion. A special device was designed to measure the force of screw-in effect. A dynamometer of the device recorded the screw-in force during simulated canal preparation and the recorded data was stored in a computer with designed software (LCV-USE-VS, Lorenz Messtechnik GmbH, Alfdorf, Germany). The data were subjected to one-way ANOVA and Tukey's multiple range test for post-hoc test. P value of less than 0.05 was regarded significant.
ProTaper® produced significantly more screw-in effects than any other instruments in the study (p < 0.001). K3™ produced significantly more screw-in effects than Mtwo, and ProFile® (p < 0.001). There was no significant difference among Mtwo, NRT, and ProFile® (p > 0.05), and between NRT with active tip and NRT with safe one neither (p > 0.05).
From the result of the present study, it was concluded, therefore, that there seems significant differences of screw-in effect among the tested nickel-titanium rotary instruments. The radial lands and rake angle of nickel-titanium rotary instrument might be the cause of the difference.
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Citations
Citations to this article as recorded by 
- Impact of Radial Lands on the Reduction of Torque/Force Generation of a Heat-Treated Nickel-Titanium Rotary Instrument
Taro Nakatsukasa, Arata Ebihara, Moe Sandar Kyaw, Satoshi Omori, Hayate Unno, Shunsuke Kimura, Keiichiro Maki, Takashi Okiji Applied Sciences.2022; 12(5): 2620. CrossRef - Comparative evaluation of mechanical properties and shaping performance of heat-treated nickel titanium rotary instruments used in the single-length technique
Taro NAKATSUKASA, Arata EBIHARA, Shunsuke KIMURA, Keiichiro MAKI, Miki NISHIJO, Daisuke TOKITA, Takashi OKIJI Dental Materials Journal.2021; 40(3): 743. CrossRef - Analysis of Torque and Force Induced by Rotary Nickel-Titanium Instruments during Root Canal Preparation: A Systematic Review
Myint Thu, Arata Ebihara, Sherif Adel, Takashi Okiji Applied Sciences.2021; 11(7): 3079. CrossRef - Influence of rotational speed on torque/force generation and shaping ability during root canal instrumentation of extracted teeth with continuous rotation and optimum torque reverse motion
M. S. Kyaw, A. Ebihara, Y. Kasuga, K. Maki, S. Kimura, P. H. Htun, T. Nakatsukasa, T. Okiji International Endodontic Journal.2021; 54(9): 1614. CrossRef - Influence of glide path on the screw-in effect and torque of nickel-titanium rotary files in simulated resin root canals
Jung-Hong Ha, Sang-Shin Park Restorative Dentistry & Endodontics.2012; 37(4): 215. CrossRef - Influence of root canal curvature on the screw-in effect of nickel-titanium rotary files in simulated resin root canal
Ji-Young Son, Jung-Hong Ha, Young-Kyung Kim Journal of Korean Academy of Conservative Dentistry.2010; 35(5): 374. CrossRef - Influence of taper on the screw-in effect of nickel-titanium rotary files in simulated resin root canal
Hye-Jin Sung, Jung-Hong Ha, Sung-Kyo Kim Journal of Korean Academy of Conservative Dentistry.2010; 35(5): 380. CrossRef
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The influence of combining composite resins with different elastic modulus on the stress distribution of Class V restoration: a three-dimensional finite element study
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Jeong-Kil Park, Bock Hur, Sung-Kyo Kim
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J Korean Acad Conserv Dent 2008;33(3):184-197. Published online May 31, 2008
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DOI: https://doi.org/10.5395/JKACD.2008.33.3.184
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Abstract
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This study was to investigate the influence of combining composite resins with different elastic modulus, and occlusal loading condition on the stress distribution of restored notch-shaped non-carious cervical lesion using 3D finite element (FE) analysis.
The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. A notch-shaped cavity was modeled and filled with hybrid, flowable resin or a combination of both. After restoration, a static load of 500N was applied in a point-load condition at buccal cusp and palatal cusp. The stress data were analyzed using analysis of principal stress.
Results showed that combining method such that apex was restored by material with high elastic modulus and the occlusal and cervical cavosurface margin by small amount of material with low elastic modulus was the most profitable method in the view of tensile stress that was considered as the dominant factor jeopardizing the restoration durability and promoting the lesion progression.
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Citations
Citations to this article as recorded by 
- Effect of restoration type on the stress distribution of endodontically treated maxillary premolars; Three-dimensional finite element study
Heun-Sook Jung, Hyeon-Cheol Kim, Bock Hur, Kwang-Hoon Kim, Kwon Son, Jeong-Kil Park Journal of Korean Academy of Conservative Dentistry.2009; 34(1): 8. CrossRef - Stress distribution of endodontically treated maxillary second premolars restored with different methods: Three-dimensional finite element analysis
Dong-Yeol Lim, Hyeon-Cheol Kim, Bock Hur, Kwang-Hoon Kim, Kwon Son, Jeong-Kil Park Journal of Korean Academy of Conservative Dentistry.2009; 34(1): 69. CrossRef - Finite element analysis of maxillary central incisors restored with various post-and-core applications
MinSeock Seo, WonJun Shon, WooCheol Lee, Hyun-Mi Yoo, Byeong-Hoon Cho, Seung-Ho Baek Journal of Korean Academy of Conservative Dentistry.2009; 34(4): 324. CrossRef - Stress analysis of maxillary premolars with composite resin restoration of notch-shaped class V cavity and access cavity; Three-dimensional finite element study
Seon-Hwa Lee, Hyeon-Cheol Kim, Bock Hur, Kwang-Hoon Kim, Kwon Son, Jeong-Kil Park Journal of Korean Academy of Conservative Dentistry.2008; 33(6): 570. CrossRef
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Stress distribution of Class V composite resin restorations: A three-dimensional finite element study
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Jeong-Kil Park, Bock Hur, Sung-Kyo Kim
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J Korean Acad Conserv Dent 2008;33(1):28-38. Published online January 31, 2008
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DOI: https://doi.org/10.5395/JKACD.2008.33.1.028
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Abstract
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This study was to investigate the influence of composite resins with different elastic modulus, cavity modification and occlusal loading condition on the stress distribution of restored notch-shaped noncarious cervical lesion using 3-dimensional (3D) finite element (FE) analysis.
The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. A notch-shaped cavity and a modified cavity with a rounded apex were modeled. Unmodified and modified cavities were filled with hybrid or flowable resin. After restoration, a static load of 500N was applied in a point-load condition at buccal cusp and palatal cusp. The stress data were analyzed using analysis of principal stress.
The results were as follows:
In the unrestored cavity, the stresses were highly concentrated at mesial CEJ and lesion apex and the peak stress was observed at the mesial point angle under both loading conditions.
After restoration of the cavity, stresses were significantly reduced at the lesion apex, however cervical cavosurface margin, stresses were more increased than before restoration under both loading conditions.
When restoring the notch-shaped lesion, material with high elastic modulus worked well at the lesion apex and material with low elastic modulus worked well at the cervical cavosurface margin.
Cavity modification the rounding apex did not reduce compressive stress, but tensile stress was reduced.
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Citations
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- Effect of Loading and Restoration on the Biomechanical Behavior of Premolars with Simulated Abfraction Lesions
Deepa N Thangaraj, Sebeena Mathew, Karthick Kumaravadivel, Kerena Joseline, Boopathi Thangavel, Manimaran Sekar World Journal of Dentistry.2025; 15(12): 1076. CrossRef - Numerical investigation of stress concentration at the tip of the V-notch partially filled with material
V.P. Matveenko, A.Y. Fedorov, E.B. Galkina Computational Continuum Mechanics.2022; 15(3): 333. CrossRef - Clinical Evaluation of Bioactive Restorative Material versus Resin Modified Glass Ionomer in Cervical Restorations: A Randomized Controlled Clinical Trial
Yehia Hafez Yehia, Amir Hafez Ibrahim, Eman Abou-auf, Amira Farid Elzogbhi Open Access Macedonian Journal of Medical Sciences.2022; 10(D): 33. CrossRef - Effects of Root Maturation and Thickness Variation in Coronal Mineral Trioxide Aggregate Plugs Under Traumatic Load on Stress Distribution in Regenerative Endodontic Procedures: A 3-dimensional Finite Element Analysis Study
Akif Demirel, Tuğba Bezgin, Şaziye Sarı Journal of Endodontics.2021; 47(3): 492. CrossRef - Finite element analysis of V-shaped tooth defects filled with universal nanohybrid composite using incremental technique
Tsanka Dikova, Tihomir Vasilev, Vesela Hristova, Vladimir Panov Journal of the Mechanical Behavior of Biomedical Materials.2021; 118: 104425. CrossRef - Are Increased Masticatory Forces Risk for Primary 2nd Molars without Successors? A 3D FEA Study
Akif Demirel, Şaziye Sarı Journal of Clinical Pediatric Dentistry.2019; 43(1): 64. CrossRef - Finite element analysis of maxillary central incisors restored with various post-and-core applications
MinSeock Seo, WonJun Shon, WooCheol Lee, Hyun-Mi Yoo, Byeong-Hoon Cho, Seung-Ho Baek Journal of Korean Academy of Conservative Dentistry.2009; 34(4): 324. CrossRef - The influence of combining composite resins with different elastic modulus on the stress distribution of Class V restoration: a three-dimensional finite element study
Jeong-Kil Park, Bock Hur, Sung-Kyo Kim Journal of Korean Academy of Conservative Dentistry.2008; 33(3): 184. CrossRef - Stress analysis of maxillary premolars with composite resin restoration of notch-shaped class V cavity and access cavity; Three-dimensional finite element study
Seon-Hwa Lee, Hyeon-Cheol Kim, Bock Hur, Kwang-Hoon Kim, Kwon Son, Jeong-Kil Park Journal of Korean Academy of Conservative Dentistry.2008; 33(6): 570. CrossRef
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REGULATION OF PULPAL MICROCIRCULATION BY CALCITONIN GENE-RELATED PEPTIDE
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Sung-Kyo Kim, Young-Kyung Kim, Myoung-Uk Jin
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J Korean Acad Conserv Dent 2005;30(6):470-476. Published online January 14, 2005
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DOI: https://doi.org/10.5395/JKACD.2005.30.6.470
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Abstract
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- Abstract
The purpose of this study was to investigate the function of calcitonin gene-related peptide (CGRP) in regulatory mechanism of pulpal microcirculation with the aim of elucidating neurogenic inflammation.
Experiments were performed on twelve cats under general anesthesia. CGRP was administered through the femoral vein to see the systemic influence and through the external carotid artery to see the local effect. Sympathetic nerve to the dental pulp was stimulated electrically and pulpal blood flow (PBF) was measured with a laser Doppler flowmeter on the canine teeth to the drug administration. The paired variables of control and experimental data were compared by paired t-test and differences with p < 0.05 were considered statistically significant.
Systemic administration of CGRP (0.3 μg/kg) exerted decreases in systemic blood pressure and caused changes in PBF with an initial increase followed by decrease and a more marked second increase and decrease.
Close intra-arterial (i.a.) injection of CGRP (0.03 μ/kg) resulted in slight PBF increase. The effect of CGRP resulted in no significant increase in PBF in the presence of CGRP8-37.
The electrical stimulation of the sympathetic nerve alone resulted in PBF decreases. The i.a. administration of CGRP following the electrical stimulation of the sympathetic nerve compensated the decreased PBF. Therefore, CGRP effectively blocked the sympathetic nerve stimulation-induced PBF decrease.
Results of the present study have provided evidences that even though the local vasodilatory function of CGRP are weak, CGRP is effectively involved in blocking the vasoconstriction caused by sympathetic nerve stimulation in the feline dental pulp.
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Obturation efficiency of non-standardized gutta-percha cone in curved root canals prepared with 0.06 taper nickel-titanium instruments
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Eun-Ah Lee, Sung-Kyo Kim
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J Korean Acad Conserv Dent 2005;30(2):79-85. Published online March 31, 2005
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DOI: https://doi.org/10.5395/JKACD.2005.30.2.079
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Abstract
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The purpose of this study was to evaluate the obturation efficiency of a non-standardized gutta-percha cone in curved root canals prepared with 0.06 taper nickel-titanium instruments.
Sixty simulated curved root canals in clear resin blocks were prepared with crown-down technique using 0.06 taper rotary ProTaper™ and ProFile (Dentsply-Maillefer) until apical canal was size 30. Root canals were randomly divided into 4 groups of 15 blocks and obturated with cold-laterally compacted gutta-percha technique by using either a non-standardized size medium gutta-percha cone or an ISO-standardized size 30 one as a master cone. Gutta-percha area ratio were calculated at apical levels of 1, 3, and 5 mm using AutoCAD 2000 after cross-sectioning, and the data were analyzed with one-way and two-way ANOVAs and Duncan's multiple range test.
Non-standardized size medium cone groups showed significantly higher gutta-percha area ratio than standardized cone groups at all apical levels (p < 0.01).
Non-standardized cone groups used significantly less accessory cones than standardized cone groups (p < 0.01).
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Citations
Citations to this article as recorded by 
- Efficiency of Using Different Greater Taper Gutta-Percha Cones in Continuous Warm Vertical Condensation: An Ex Vivo Study
Mamata Hebbal, Reem Barakat, Rahaf Almohareb, Ghada Alaskar, Lama Alghufaily, Nouf AlFarraj, Alia Albaz The Journal of Contemporary Dental Practice.2021; 22(1): 56. CrossRef
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Influence of plugger penetration depth on the apical extrusion of root canal sealer in Continuous Wave of Condensation Technique
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Ho-Young So, Young-Mi Lee, Kwang-Keun Kim, Ki-Ok Kim, Young-Kyung Kim, Sung-Kyo Kim
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J Korean Acad Conserv Dent 2004;29(5):439-445. Published online January 14, 2004
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DOI: https://doi.org/10.5395/JKACD.2004.29.5.439
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Abstract
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- ABSTRACT
The purpose of this study was to evaluate the influence of plugger penetration depth on the apical extrusion of root canal sealer during root canal obturation with Continuous Wave of Condensation Technique.
Root canals of forty extracted human teeth were divided into four groups and were prepared up to size 40 of 0.06 taper with ProFile. After drying, canals of three groups were filled with Continuous Wave of Condensation Technique with System B™ and different plugger penetration depths of 3, 5, and 7 mm from the apex. Canals of one group were filled with cold lateral compaction technique as a control. Canals were filled with non-standardized master gutta-percha cones and 0.02 mL of Sealapex. Apical extruded sealer was collected in a container and weighed. Data was analyzed with one-way ANOVA and Duncan’s Multiple Range Test. 3 and 5 mm penetration depth groups in Continuous Wave of Condensation Technique showed significantly more extrusion of root canal sealer than 7 mm penetration depth group (p < 0.05). However, there was no significant difference between 7 mm depth group in Continuous Wave of Condensation Technique and cold lateral compaction group (p < 0.05).
The result of this study demonstrates that deeper plugger penetration depth causes more extrusion of root canal sealer in root canal obturation by Continuous Wave of Condensation Technique. Therefore, special caution is needed when plugger penetration is deeper in the canal in Continuous Wave of Condensation Technique to minimize the amount of sealer extrusion beyond apex.
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Citations
Citations to this article as recorded by 
- Influence of plugger penetration depth on the area of the canal space occupied by gutta-percha
Young Mi Lee, Ho-young So, Young Kyung Kim, Sung Kyo Kim Journal of Korean Academy of Conservative Dentistry.2006; 31(1): 66. CrossRef
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Shaping ability of four rotary nickel-titanium instruments to prepare root canal at danger zone
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Seok-Dong Choi, Myoung-Uk Jin, Ki-Ok Kim, Sung-Kyo Kim
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J Korean Acad Conserv Dent 2004;29(5):446-453. Published online September 30, 2004
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DOI: https://doi.org/10.5395/JKACD.2004.29.5.446
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Abstract
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The aim of this study was to evaluate the shaping abilities of four different rotary nickel-titanium instruments with anticurvature motion to prepare root canal at danger zone by measuring the change of dentin thickness in order to have techniques of safe preparation of canals with nickel-titanium files.
Mesiobuccal and mesiolingual canals of forty mesial roots of extracted human lower molars were instrumented using the crown-down technique with ProFile, GT™ Rotary file, Quantec file and ProTaper™. In each root, one canal was prepared with a straight up-and-down motion and the other canal was with an anticurvature motion. Canals were instrumented until apical foramens were up to size of 30 by one operator. The muffle system was used to evaluate the root canal preparation. After superimposing the pre- and post-instrumentation canal, change in root dentin thickness was measured at the inner and outer sides of the canal at 1, 3, and 5 mm levels from the furcation. Data were analyzed using two-way ANOVA.
Root dentin thickness at danger zone was significantly thinner than that at safe zone at all levels (p < 0.05).
There was no significant difference in the change of root dentin thickness between the straight up-and-down and the anticurvature motions at both danger and safe zones in all groups (p > 0.05).
ProTaper removed significantly more dentin than other files especially at furcal 3 mm level of danger and safe zones (p < 0.05)
Therefore, it was concluded that anticurvature motion with nickel-titanium rotary instruments does not seem to be effective in danger zone of lower molars.
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Citations
Citations to this article as recorded by 
- Conservation of dentin thickness in the root canals orifice following two preparation techniques
Ranjdar Talabani, Shawbo Ahmad, Arass Noori Sulaimani Dental Journal.2014; 1(2): 6. CrossRef - Change of working length in curved canals by various instrumentation techniques
Jeong-Im Jo, Myoung-Uk Jin, Young Kyung Kim, Sung Kyo Kim Journal of Korean Academy of Conservative Dentistry.2006; 31(1): 30. CrossRef - Effect of anticurvature filing method on preparation of the curved root canal using ProFile
Hyun-Ji Song, Juhea Chang, Kyung-Mo Cho, Jin-Woo Kim Journal of Korean Academy of Conservative Dentistry.2005; 30(4): 327. CrossRef
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Local application of NK1 receptor antagonists and pulpal blood flow in cat
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Young-Kyung Kim, Wan-Sik Chu, Ho-Jeong Lee, Dong-Kuk Ahn, Hyun-Mi Yoo, Sung-Kyo Kim
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J Korean Acad Conserv Dent 2004;29(3):239-248. Published online May 31, 2004
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DOI: https://doi.org/10.5395/JKACD.2004.29.3.239
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Abstract
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The purpose of this study was to investigate the influence of NK1 receptor antagonists on the pulpal blood flow (PBF) when applied iontophoretically through the dentinal cavity of the teeth in order to understand whether iontophoretically applied NK1 receptor antagonists can control the pulpal inflammation.
Eleven cats were anesthetized with alpha-chloralose and urethane, and substance P (SP) was administered to the dental pulp through the catheterized lingual artery in doses that caused PBF change without the influence of systemic blood pressure. NK1 receptor antagonists were applied iontophoretically to the prepared dentinal cavity of ipsilateral canine teeth of the drug administration, and PBF was monitored. Data were analyzed statistically with paired t-test.
PBF increase after iontophoretic application of the NK1 receptor antagonists followed by the intra-arterial administration of SP was significantly less than PBF increase after iontophoretic application of the 0.9% saline followed by the intra-arterial administration of SP as a control (p < 0.05).
Iontophoretic application of the NK1 receptor antagonists (0.2~3.4 mM) following the intra-arterial administration of SP resulted in less increase of PBF than the iontophoretic application of the 0.9% saline following the intra-arterial administration of SP as a control (p < 0.05).
Therefore, the results of the present study provide evidences that the iontophoretic application is an effective method to deliver drugs to the dental pulp, and that iontophoretically applied NK1 receptor antagonists block SP-induced vasodilation effectively. The above results show the possibility that the iontophoretical application of NK1 receptor antagonists can control the neurogenic inflammation in the dental pulp.
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Nitric oxide and dental pulp
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Young-Kyung Kim, Sung-Kyo Kim
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J Korean Acad Conserv Dent 2002;27(5):543-551. Published online September 30, 2002
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DOI: https://doi.org/10.5395/JKACD.2002.27.5.543
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Abstract
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Nitric oxide (NO) is a small molecule (mol. wt. 30 Da) and oxidative free radical. It is uncharged and can therefore diffuse freely within and between cells across membrane. Such characteristics make it a biologically important messenger in physiologic processes such as neurotransmission and the control of vascular tone. NO is also highly toxic and is known to acts as a mediator of cytotoxicity during host defense.
NO is synthesized by nitric oxide synthase (NOS) through L-arginine/nitric oxide pathway which is a dioxygenation process. NO synthesis involves several participants, three co-substrates, five electrons, five co-factors and two prosthetic groups.
Under normal condition, low levels of NO are synthesized by type I and III NOS for a short period of time and mediates many physiologic processes. Under condition of oxidant stress, high levels of NO are synthesized by type II NOS and inhibits a variety of metabolic processes and can also cause direct damage to DNA. Such interaction result in cytostasis, energy depletion and ultimately cell death. NO has the potential to interact with a variety of intercellular targets producing diverse array of metabolic effects.
It is known that NO is involved in hemodynamic regulation, neurogenic inflammation, re-innervation, management of dentin hypersensitivity on teeth. Under basal condition of pulpal blood flow, NO provides constant vasodilator tone acting against sympathetic vasoconstriction. Substance P, a well known vasodilator, was reported to be mediated partly by NO, while calcitonin-gene related peptide has provided no evidence of its relation with NO.
This review describes the roles of NO in dental pulp in addition to the known general roles of it.
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Citations
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- Induction of Nitric Oxide and Its Role in Otitis Media
Yeon Ju Oh, Jae Min Lee, Joon Hyung Yeo, Sung Soo Kim, Seung Geun Yeo Antioxidants.2025; 14(3): 327. CrossRef - Induction of Nitric Oxide and Its Role in Facial Nerve Regeneration According to the Method of Facial Nerve Injury
Yeon Ju Oh, Dong Keon Yon, Yong Sung Choi, Jinseok Lee, Joon Hyung Yeo, Sung Soo Kim, Jae Min Lee, Seung Geun Yeo Antioxidants.2024; 13(6): 741. CrossRef
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The effect of irradiation modes on polymerization and microleakage of composite resin
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Jong-Jin Park, Jeong-Won Park, Sung-Ho Park, Ju-Myong Park, Tae-Kyung Kwon, Sung-Kyo Kim
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J Korean Acad Conserv Dent 2002;27(2):158-174. Published online March 31, 2002
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DOI: https://doi.org/10.5395/JKACD.2002.27.2.158
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Abstract
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The aim of this study was to investigate the effect of light irradiation modes on polymerization shrinkage, degree of cure and microleakage of a composite resin.
VIP™ (Bisco Dental Products, Schaumburg, IL, USA) and Optilux 501™ (Demetron/Kerr, Danbury, CT, USA) were used for curing Filtek™ Z-250 (3M Dental Products, St. Paul., MN, USA) composite resin using following irradiation modes: VIP™ (Bisco) 200mW/cm2 (V2), 400mW/cm2 (V4), 600mW/cm2 (V6), Pulse-delay (200 mW/cm2 3 seconds, 5 minutes wait, 600mW/cm2 30seconds, VPD) and Optilux 501™ (Demetron/Kerr) C-mode (OC), R-mode (OR).
Linear polymerization shrinkage of the composite specimens were measured using Linometer (R&B, Daejeon, Korea) for 90 seconds for V2, V4, V6, OC, OR groups and for up to 363 seconds for VPD group (n=10, each).
Degree of conversion was measured using FTIR spectrometer (IFS 120 HR, Bruker Karlsruhe, Germany) at the bottom surface of 2 mm thick composite specimens. V2, V4, V6, OC groups were measured separately at five irradiation times (5, 10, 20, 40, 60 seconds) and OR, VPD groups were measured in the above mentioned irradiation modes (n=5, each).
Microhardness was measured using Digital microhardness tester (FM7, Future-Tech Co., Tokyo, Japan) at the top and bottom surfaces of 2mm thick composite specimens after exposure to the same irradiation modes as the test of degree of conversion(n=3, each).
For the microleakage test, class V cavities were prepared on the distal surface of the ninety extracted human third molars. The cavities were restored with one of the following irradiation modes: V2/60 seconds, V4/40 seconds, V6/30 seconds, VPD, OC and OR. Microleakage was assessed by dye penetration along enamel and dentin margins of cavities.
Mean polymerization shrinkage, mean degree of conversion and mean microhardness values for all groups at each time were analyzed using one-way ANOVA and Duncan's multiple range test, and using chi-square test for microleakage values.
The results were as follows:
·Polymerization shrinkage was increased with higher light intensity in groups using VIP™ (Bisco): the highest with 600mW/cm2, followed by Pulse-delay, 400mW/cm2 and 200mW/cm2 groups. The degree of polymerization shrinkage was higher with Continuous mode than with Ramp mode in groups using Optilux 501™ (Demetron/Kerr).
·Degree of conversion and microhardness values were higher with higher light intensity. The final degree of conversion was in the range of 44.7 to 54.98% and the final microhardness value in the range of 34.10 to 56.30.
·Microleakage was greater in dentin margin than in enamel margin. Higher light intensity showed more microleakage in dentin margin in groups using VIP™ (Bisco). The micoleakage was the lowest with Continuous mode in enamel margin and with Ramp mode in dentin margin when Optilux 501™(Demetron/Kerr) was used.
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Citations
Citations to this article as recorded by 
- Study on the Effect of Soft-Start Light on Microleakage in Pit and Fissure Closure
Yong Chen, Ling Guo Journal of Hard Tissue Biology.2023; 32(2): 105. CrossRef - Power density of light curing units through resin inlays fabricated with direct and indirect composites
Hoon-Sang Chang, Young-Jun Lim, Jeong-Mi Kim, Sung-Ok Hong Journal of Korean Academy of Conservative Dentistry.2010; 35(5): 353. CrossRef
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