Restorative Dentistry & Endodontics

Mechanical and geometric features of endodontic instruments and its clinical effect: Hyeon-Cheol Kim; J Korean Acad Conserv Dent 2011;36(1):1-11. Published online January 14, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.1.1

Abstract Introduction:

The aim of this paper is to discuss the mechanical and geometric features of Nickel-titanium (NiTi) rotary files and its clinical effects. NiTi rotary files have been introduced to the markets with their own geometries and claims that they have better ability for the root canal shaping than their competitors. The contents of this paper include the (possible) interrelationship between the geometries of NiTi file (eg. tip, taper, helical angle, etc) and clinical performance of the files as follows;

- Fracture modes of NiTi rotary files

- Non-cutting guiding tip and glide path

- Taper and clinical effects

- Cross-sectional area and clinical effects

- Heat treatments and surface characteristics

- Screw-in effect and preservation of root dentin integrity

- Designs for reducing screw-in effect

Conclusions:

Based on the reviewed contents, clinicians may have an advice to use various brands of NiTi rotary instruments regarding their advantages which would fit for clinical situation.

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Cyclic fatigue resistance tests of Nickel-Titanium rotary files using simulated canal and weight loading conditions
Ok-In Cho, Antheunis Versluis, Gary SP Cheung, Jung-Hong Ha, Bock Hur, Hyeon-Cheol Kim
Restorative Dentistry & Endodontics.2013; 38(1): 31. CrossRef

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Short-term clinical outcome of intentionally replanted posterior molars: Yong-Hoon Choi; J Korean Acad Conserv Dent 2011;36(1):12-18. Published online January 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.1.12

Abstract PDF PubReader ePub

Objectives

This retrospective study evaluated the therapeutic effects of the intentional replantation (IR) procedure performed on the maxillary and mandibular molars of 35 patients.

Materials and Methods

For the subjects, IR was performed due to difficulties in anatomically accessing the lesions and/or close proximity to the thick cortical bone, inferior alveolar nerve, or maxillary sinus, which rendered the ordinary periradicular surgery impossible. The patients' progress was followed for a year and up to 2 years and 4 months. The success of the procedure was evaluated in terms of clinical and radiographic success (%).

Results

The results revealed the following: (a) 1 case (3%) of failed tooth extraction during IR; (b) 2 cases (6%) of extraction due to periodontal diseases and inflammatory root resorption; (c) 3 cases (9%) of normally functioning teeth in the oral cavity with minor mobility and apical root resorption, and; (d) 29 cases (82%) of normally functioning teeth without obvious problems.

Conclusions

IR was confirmed to be a reliably repeatable, predictable treatment option for those who cannot receive conventional periradicular surgery because of anatomic limitations or patient factors.

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Retrospective study of intentional tooth replantation
Joo-Hyuck Park, Sel Ae Hwang, Suk-Ja Yoon, Byung-Cheol Kang, Kyung-Min Lee, Jae-Seo Lee
Oral Biology Research.2017; 41(4): 201. CrossRef
Intentional Replantation of a Root-Fractured Tooth with Pulp Canal Obliteration
Mihee Kim, Sangho Lee, Nanyoung Lee
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY.2016; 43(2): 200. CrossRef

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A retrospective study of the intentionally replanted mandibular second molars with C-shaped root canal configurations: Won-Jun Shon, Kee-Yeon Kum, Seung-Ho Baek, Woo-Cheol Lee; J Korean Acad Conserv Dent 2011;36(1):19-25. Published online January 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.1.19

Abstract PDF PubReader ePub: Objectives
The purpose of this retrospective study was to evaluate the success rate of intentionally replanted mandibular second molar with C-shaped canal configurations and to access the impact of preoperative periapical lesion on the success of intentional replantation procedure.
Materials and Methods
This retrospective chart review study evaluated 52 intentionally replanted mandibular second molar teeth treated at Seoul National University Dental Hospital Department of Conservative Dentistry from January 2005 to December 2007. Seventeen teeth were lost for the follow-up, and another 6 teeth did not meet inclusion criteria of C-shaped root canal configurations. Healing outcome such as success, uncertain healing, and failure after follow-up was evaluated by clinical criteria and radiographs.
Results
The overall success rate was 72.4% for the 29 intentionally replanted C-shaped mandibular second molars. The success rate of replanted teeth with preoperative periapical lesions was similar to that of replanted teeth which have no periapical lesions.
Conclusions
Therefore, root canal treatment failure on C-shaped mandibular second molar can be predictably treated by intentional replantation regardless of the presence of periapical lesion.

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The effect of tumor necrosis factor (TNF)-α to induce matrix metalloproteinase (MMPs) from the human dental pulp, gingival, and periodontal ligament cells: Eun-Mi Rhim, Sang-Hyuk Park, Duck-Su Kim, Sun-Young Kim, Kyoung-Kyu Choi, Gi-Woon Choi; J Korean Acad Conserv Dent 2011;36(1):26-36. Published online January 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.1.26

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Objectives

In the present study, three kinds of tissues cells (pulp, gingiva, and periodontal ligament) were investigated if those cells express MMP and TIMP when they were stimulated with neuropeptides (substance P, CGRP) or proinflammatory cytokine, TNF-α.

Materials and Methods

The cells cultured from human dental pulp (PF), gingiva (GF) and periodontal ligament were (PDLF) stimulated with Mock, SP, TNF-α, and CGRP for 24 hrs and 48 hrs. for an RNase protection assay and Enzyme Linked Immunosorbent Assay.

Cells (PF, GF and PDLF) seeded in 100 mm culture dish were stimulated with SP (10^-5, 10^-8 M) or only with medium (Mock stimulation) for 4hrs and for 24 hrs for RNase Protection Assay, and they were stimulated with CGRP (10^-5 M) and TNF-α (2 ng/mL) for 24 hrs and with various concentraion of TNF-α (2, 10, and 100 ng/mL) for Rnase Protection Assay with a human MMP-1 probe set including MMP 1, 2, 8, 7, 8, 9, 12, and TIMP 2, 3.

In addition, cells (PF, GF and PDLF) were stimulated with Mock and various concentraion of TNF-α (2, 10, and 100 ng/mL) for 24 hrs and with TNF-α (10 ng/mL) for 48 hrs, and the supernatents from the cells were collected for Enzyme Linked Immunosorbent Assay (ELISA) for MMP-1 and MMP-13.

Results

The expression of MMPs in PF, GF, PDLF after stimulation with SP and CGRP were not changed compared with Mock stimulation for 4 hrs and 24 hrs. The expression of MMP-1, -12, -13 24 hrs after stimulation with TNF-α were upregulated, however the expression of TIMP-3 in PF, GF, PDLF after stimulation with TNF-α were downregulated. TNF-α (2 ng/mL, 10 ng/mL, 100 ng/mL) increased MMP-1 and MMP-12 expression in PF dose dependently for 24 hrs.

Conclusions

TNF-α in the area of inflammation may play an important role in regulating the remodeling of dentin, cementum, and alveolar bone.

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Anti‐Inflammatory Effects of Melatonin and 5‐Methoxytryptophol on Lipopolysaccharide‐Induced Acute Pulpitis in Rats
Fatma Kermeoğlu, Umut Aksoy, Abdullah Sebai, Gökçe Savtekin, Hanife Özkayalar, Serkan Sayıner, Ahmet Özer Şehirli, Shuai CHEN
BioMed Research International.2021;[Epub] CrossRef
Cross-Talk between Ciliary Epithelium and Trabecular Meshwork Cells In-Vitro: A New Insight into Glaucoma
Natalie Lerner, Elie Beit-Yannai, Wayne Iwan Lee Davies
PLoS ONE.2014; 9(11): e112259. CrossRef

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The evaluation of color and color difference according to the layering placement of Incisal shade composites on the body composites of the indirect resin restoration: Su-Jung Park, Han-Young Lee, Myong-Yun Nah, Hoon-Sang Chang, Yun-Chan Hwang, Won-Mann Oh, In-Nam Hwang; J Korean Acad Conserv Dent 2011;36(1):37-49. Published online January 14, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.1.37

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Abstract Objectives:

The aim of this study was to evaluate the surface color of indirect resin restoration according to the layering placement of different shade of incisal composite.

Materials and Methods:

In this study, CIE L*a*b* value of 16 Body composite of Tescera ATL (Bisco, Schaumburg IL, USA) was measured by spectrophotometer (NF999, Nippon Denshuku, Japan), and compared to CIE L*a*b* value of Vitapan shade guide. Nine shade Incisal composite of Tescera ATL were buildup to 1 mm thickness on Body composites inlay block, and CIE L*a*b* value was measured. Incisal composite was ground to 0.5 mm thickness and CIE L*a*b* value was re-measured. Color difference between Body composite and Incisal composites layered on Body composite was calculated as a function of thickness.

Results:

Color difference between corresponding shade of Tescera Body composite and Vitapan shade guide was from 6.88 to 12.80.

L* and b*value was decreased as layering thickness of Incisal composite on Body composite was increased. But, a* value did not show specific change tendency.

Conclusions:

Surface color difference between Body composites and Incisal composites layered on Body composite was increased as the layering thickness of Incisal composite increased (p < 0.05).

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Color stability of esthetic restorative materials after application of fluoride varnishes
Chul-Hoon Jang, Dong-Gil Jang, Bin-Na Lee, Hoon-Sang Chang, Yun-Chan Hwang, Won-Mann Oh, In-Nam Hwang
Korean Journal of Dental Materials.2021; 48(3): 147. CrossRef
Color Change in Tooth Induced by Various Calcium Silicate-Based Pulp-Capping Materials
Jiyoon Jeon, Namki Choi, Seonmi Kim
THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY.2021; 48(3): 280. CrossRef
Discrimination between FRC-post and core according to the color difference
Jou-Hwe Kim, Jin-Woo Kim, Kyung-Mo Cho, Se-Hee Park
Journal of Dental Rehabilitation and Applied Science.2015; 31(2): 75. CrossRef
Optical characteristics of resin composite before and after polymerization
Ah-Hyang Eom, Duck-Su Kim, Soo-Hee Lee, Chang-Won Byun, Noh-Hoon Park, Kyoung-Kyu Choi
Journal of Korean Academy of Conservative Dentistry.2011; 36(3): 219. CrossRef

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Microshear bond strength of a flowable resin to enamel according to the different adhesive systems: Jeong-Ho Kim, Young-Gon Cho; J Korean Acad Conserv Dent 2011;36(1):50-58. Published online January 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.1.50

Abstract PDF PubReader ePub

Objectives

The purpose of this study was to compare the microshear bond strength (uSBS) of two total-etch and four self-etch adhesive systems and a flowable resin to enamel.

Materials and Methods

Enamels of sixty human molars were used. They were divided into one of six equal groups (n = 10) by adhesives used; OS group (One-Step Plus), SB group (Single Bond), CE group (Clearfil SE Bond), TY group (Tyrian SPE/One-Step Plus), AP group (Adper Prompt L-Pop) and GB group (G-Bond).

After enamel surfaces were treated with six adhesive systems, a flowable composite resin (Filek Z 350) was bonded to enamel surface using Tygon tubes. the bonded specimens were subjected to uSBS testing and the failure modes of each group were observed under FE-SEM.

Results

1. The uSBS of SB group was statistically higher than that of all other groups, and the uSBS of OS, SE and AP group was statistically higher than that of TY and GB group (p < 0.05).

2. The uSBS for TY group was statistically higher than that for GB group (p < 0.05).

3. Adhesive failures in TY and GB group and mixed failures in SB group and SE group were often analysed. One cohesive failure was observed in OS, SB, SE and AP group, respectively.

Conclusions

Although adhesives using the same step were applied the enamel surface, the uSBS of a flowable resin to enamel was different.

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Enamel pretreatment with Er:YAG laser: effects on the microleakage of fissure sealant in fluorosed teeth
Mahtab Memarpour, Nasrin Kianimanesh, Bahareh Shayeghi
Restorative Dentistry & Endodontics.2014; 39(3): 180. CrossRef

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Comparison of apical transportation and change of working length in K3, NRT AND PROFILE rotary instruments using transparent resin block: Min-Jung Yoon, Min-Ju Song, Su-Jung Shin, Euiseong Kim; J Korean Acad Conserv Dent 2011;36(1):59-65. Published online January 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.1.59

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Objectives

The purpose of this study is to compare the apical transportation and working length change in curved root canals created in resin blocks, using 3 geometrically different types of Ni-Ti files, K3, NRT, and Profile.

Materials and Methods

The curvature of 30 resin blocks was measured by Schneider technique and each groups of Ni-Ti files were allocated with 10 resin blocks at random. The canals were shaped with Ni-Ti files by Crown-down technique. It was analyzed by Double radiograph superimposition method (Backman CA 1992), and for the accuracy and consistency, specially designed jig, digital X-ray, and CAD/CAM software for measurement of apical transportation were used. The amount of apical transportation was measured at 0, 1, 3, 5 mm from 'apical foramen - 0.5 mm' area, and the alteration of the working length before and after canal shaping was also measured. For statistics, Kruskal-Wallis One Way Analysis was used.

Results

There was no significant difference between the groups in the amount of working length change and apical transportation at 0, 1, and 3 mm area (p = 0.027), however, the amount of apical transportation at 5 mm area showed significant difference between K3 and Profile system (p = 0.924).

Conclusions

As a result of this study, the 3 geometrically different Ni-Ti files showed no significant difference in apical transportation and working length change and maintained the original root canal shape.

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A comparison of dimensional standard of several nickel-titanium rotary files
Ki-Won Kim, Kyung-Mo Cho, Se-Hee Park, Ki-Yeol Choi, Bekir Karabucak, Jin-Woo Kim
Restorative Dentistry & Endodontics.2014; 39(1): 7. CrossRef

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Management of white spots: resin infiltration technique and microabrasion: Jeong-Hye Son, Bock Hur, Hyeon-Cheol Kim, Jeong-Kil Park; J Korean Acad Conserv Dent 2011;36(1):66-71. Published online January 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.1.66

Abstract PDF PubReader ePub

This case report compared the effectiveness of resin infiltration technique (Icon, DMG) with microabrasion (Opalustre, Ultradent Products, Inc.) in management of white spot lesions. It demonstrates that although neither microabrasion nor resin infiltration technique can remove white spot lesions completely, resin infiltration technique seems to be more effective than microabrasion. Therefore resin infiltration technique can be chosen preferentially for management of white spot lesions and caution should be taken for case selection.

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Deem Al-Blaihed, Omar El Meligy, Khlood Baghlaf, Rabab A Aljawi, Shahad Abudawood
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Mohamed. H. Zaazou, Reham S. Saleh, Shahinaz N. Hassan, Ali Abdelnabi, Zeinab M. Zaki, Tamer M. Hamdy, Dalia Y. Zaki, Lamiaa M. Moharam
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Seongeun Kim, Chang-Ock Lee
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Neven S. Aref, Rahaf M. Alsdrani
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Rubén Darío Miranda-Carreño, Jacqueline Adelina Rodríguez-Chávez, Abigailt Flores-Ledesma
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Dhruvi Solanki, Punit Fulzele, Nilima Thosar, Unnati Shirbhate
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Abdulaziz Alhotan, Rasha M. Abdelraouf, Saleh Alhijji, Merry Angelyn Tan De Vera, Aref Sufyan, Jukka P. Matinlinna, Tamer M. Hamdy
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Reem Majeed H.J. Al-Mamoori, Aseel Haidar M.J. Al Haidar
Journal of Baghdad College of Dentistry.2022; 34(1): 44. CrossRef
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Nouran M. Eissa, Eman M. Elshourbagy, Nahla E. Gomaa
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Basil Almutairi, Mohammed Al-Refai, Bander AL-Meshary, Abdulrahman Al-Asim, Fahad Al-Sharidah, Abdullah Alshehri
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Shaza M. Hammad, Noha A. El-Wassefy, Mohamed A. Alsayed
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