Restorative Dentistry & Endodontics

Tae-Yub Kwon

5 Articles

Post space preparation timing of root canals sealed with AH Plus sealer: Hae-Ri Kim, Young Kyung Kim, Tae-Yub Kwon; Restor Dent Endod 2017;42(1):27-33. Published online December 19, 2016; DOI: https://doi.org/10.5395/rde.2017.42.1.27

Objectives

To determine the optimal timing for post space preparation of root canals sealed with epoxy resin-based AH Plus sealer in terms of its polymerization and influence on apical leakage.

Materials and Methods

The epoxy polymerization of AH Plus (Dentsply DeTrey) as a function of time after mixing (8, 24, and 72 hours, and 1 week) was evaluated using Fourier transform infrared (FTIR) spectroscopy and microhardness measurements. The change in the glass transition temperature (T_g) of the material with time was also investigated using differential scanning calorimetry (DSC). Fifty extracted human single-rooted premolars were filled with gutta-percha and AH Plus, and randomly separated into five groups (n = 10) based on post space preparation timing (immediately after root canal obturation and 8, 24, and 72 hours, and 1 week after root canal obturation). The extent of apical leakage (mm) of the five groups was compared using a dye leakage test. Each dataset was statistically analyzed by one-way analysis of variance and Tukey's post hoc test (α = 0.05).

Results

Continuous epoxy polymerization of the material with time was observed. Although the T_g values of the material gradually increased with time, the specimens presented no clear T_g value at 1 week after mixing. When the post space was prepared 1 week after root canal obturation, the leakage was significantly higher than in the other groups (p < 0.05), among which there was no significant difference in leakage.

Conclusions

Poor apical seal was detected when post space preparation was delayed until 1 week after root canal obturation.

Citations

Citations to this article as recorded by

Bacterial microleakage in endodontically treated teeth following two methods of postspace preparation at two-time intervals: An in vitro study
AzamS Mostafavi, Mahsa Rasoulzadehsheikh, Naghmeh Meraji, Maryam Pourhajibagher
The Journal of Indian Prosthodontic Society.2022; 22(3): 233. CrossRef
Comparison of the effect of post space preparation time on the apical seal of two different sealers
Neda Hajihassani, Navid Mohammadi, Ahmad Karimi Kelayeh, Shima Aalaei
BMC Oral Health.2022;[Epub] CrossRef
Immediate and Delayed Post Space Preparations in Endodontically Treated Teeth: A Scoping Review
Sadaf Mahmoudi, Pedram Iranmanesh, Saber Khazaei, Maryam Zare Jahromi
BMC Oral Health.2022;[Epub] CrossRef
Physicochemical properties of a novel bioceramic silicone-based root canal sealer
Wei-Jia Lyu, Wei Bai, Xiao-Yan Wang, Yu-Hong Liang
Journal of Dental Sciences.2022; 17(2): 831. CrossRef
Impact of Immersion Media on Physical Properties and Bioactivity of Epoxy Resin-Based and Bioceramic Endodontic Sealers
Thais Gomes de Moraes, Alan Silva de Menezes, Renata Grazziotin-Soares, Rafael Ubaldo Moreira e Moraes, Paulo Vitor Campos Ferreira, Ceci Nunes Carvalho, Jose Bauer, Edilausson Moreno Carvalho
Polymers.2022; 14(4): 729. CrossRef
The effect of two endodontic sealers and interval before post-preparation and cementation on the bond strength of fiber posts
He Yuanli, Wu Juan, Ji Mengzhen, Chen Xuan, Xiong Kaixin, Yang Xueqin, Qiao Xin, Hu Hantao, Gao Yuan, Zou Ling
Clinical Oral Investigations.2021; 25(11): 6211. CrossRef
Sealing Ability of Various Types of Root Canal Sealers at Different Levels of Remaining Gutta Percha After Post Space Preparation at Two Time Intervals
Wiaam M O Al-Ashou, Rasha M Al-Shamaa, Shaymaa S Hassan
Journal of International Society of Preventive and Community Dentistry.2021; 11(6): 721. CrossRef
Comparison between immediate and delayed post space preparations: a systematic review and meta-analysis
Alexandre Henrique dos Reis-Prado, Lucas Guimarães Abreu, Warley Luciano Fonseca Tavares, Isabella Faria da Cunha Peixoto, Ana Cecília Diniz Viana, Elen Marise Castro de Oliveira, Juliana Vilela Bastos, Antônio Paulino Ribeiro-Sobrinho, Francine Benetti
Clinical Oral Investigations.2021; 25(2): 417. CrossRef
Apical Displacement and Residual Root Canal Filling with Single-Cone After Post Space Preparation: A Micro-CT Analysis
Camila Maria Peres de Rosatto, Lilian Vieira Oliveira, Danilo Cassiano Ferraz, Priscilla Barbosa Ferreira Soares, Carlos José Soares, Camilla Christian Gomes Moura
Brazilian Dental Journal.2020; 31(1): 25. CrossRef
Do Contaminating Substances Influence the Rheological Properties of Root Canal Sealers?
Jéssica Vavassori de Freitas, Johannes Ebert, Jardel Francisco Mazzi-Chaves, Manoel Damião de Sousa-Neto, Ulrich Lohbauer, Flares Baratto-Filho
Journal of Endodontics.2020; 46(2): 258. CrossRef

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In vitro study of Streptococcus mutans adhesion on composite resin coated with three surface sealants: Da Hye Kim, Tae-Yub Kwon; Restor Dent Endod 2017;42(1):39-47. Published online December 30, 2016; DOI: https://doi.org/10.5395/rde.2017.42.1.39

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Objectives

Although the coating of surface sealants to dental composite resin may potentially reduce bacterial adhesion, there seems to be little information regarding this issue. This preliminary in vitro study investigated the adhesion of Streptococcus mutans (S. mutans) on the dental composite resins coated with three commercial surface sealants.

Materials and Methods

Composite resin (Filtek Z250) discs (8 mm in diameter, 1 mm in thickness) were fabricated in a mold covered with a Mylar strip (control). In group PoGo, the surfaces were polished with PoGo. In groups PS, OG, and FP, the surfaces polished with PoGo were coated with the corresponding surface sealants (PermaSeal, PS; OptiGuard, OG; Fortify Plus, FP). The surfaces of the materials and S. mutans cells were characterized by various methods. S. mutans adhesion to the surfaces was quantitatively evaluated using flow cytometry (n = 9).

Results

Group OG achieved the lowest water contact angle among all groups tested (p < 0.001). The cell surface of S. mutans tested showed hydrophobic characteristics. Group PoGo exhibited the greatest bacterial adhesion among all groups tested (p < 0.001). The sealant-coated groups showed statistically similar (groups PS and FP, p > 0.05) or significantly lower (group OG, p < 0.001) bacterial adhesion when compared with the control group.

Conclusions

The application of the surface sealants significantly reduced S. mutans adhesion to the composite resin polished with the PoGo.

Citations

Citations to this article as recorded by

Polychromatic Composite and Resin Infiltration Restorations in the Esthetic Zone: A Five-year Clinical Report
K Karimi, NG Fischer, CA Jurado, J Villalobos-Tinoco, A Tsujimoto
Operative Dentistry.2023; 48(3): 245. CrossRef
Antibacterial Effect of Zirconia Nanoparticles on Polyethyl Methacrylate Resin for Provisional Crowns
Hee-Seon Kim, Woohyung Jang, Yeong-Gwan Im, Hyun-Pil Lim
International Journal of Nanomedicine.2022; Volume 17: 6551. CrossRef
Do the differences in organic contents of composite resins affect surface roughness and Streptococcus mutans adhesion?
Duygu Hisarbeyli, Nazmiye Dönmez, Nursen Topçuoğlu
Journal of Adhesion Science and Technology.2022; 36(9): 921. CrossRef
The Effect of Liquid Rubber Addition on the Physicochemical Properties, Cytotoxicity, and Ability to Inhibit Biofilm Formation of Dental Composites
Krzysztof Pałka, Małgorzata Miazga-Karska, Joanna Pawłat, Joanna Kleczewska, Agata Przekora
Materials.2021; 14(7): 1704. CrossRef
PLGA nanoparticles loaded with quaternary ammonium silane and riboflavin for potential applications in adhesive dentistry
Umer Daood, Meera Priyadarshini Balasankar, Marrwa A. Ibrahim, Mallikarjuna Rao Pichika, Kit-Kay Mak, Amr S. Fawzy
International Journal of Adhesion and Adhesives.2021; 105: 102797. CrossRef
Effect of Washing Condition on the Fracture Strength, and the Degree of Conversion of 3D Printing Resin
Woohyung Jang, Gyeong-Soo Kook, Jin-Ho Kang, Yeseul Kim, Yina Yun, Seon-Ki Lee, Sang-Won Park, Hyun-Pil Lim, Kwi-Dug Yun, Chan Park
Applied Sciences.2021; 11(24): 11676. CrossRef
Effect of surface sealant on surface roughness and bacterial adhesion of bulk-fill composites
Gunce Ozan, Meltem Mert Eren, Cansu Vatansever, Ugur Erdemir
Polymers and Polymer Composites.2021; 29(9_suppl): S475. CrossRef
Evaluation of adhesion of Streptococcus mutans, plaque accumulation on zirconia and stainless steel crowns, and surrounding gingival inflammation in primary molars: randomized controlled trial
Mebin George Mathew, S. R. Samuel, Ashu Jagdish Soni, Korishettar Basavaraj Roopa
Clinical Oral Investigations.2020; 24(9): 3275. CrossRef
Influence of resin-coating agents on the roughness and color of composite resins
Fabio A.P. Rizzante, Juliana S.F. Bombonatti, Layla Vasconcelos, Thiago S. Porto, Sorin Teich, Rafael F.L. Mondelli
The Journal of Prosthetic Dentistry.2019; 122(3): 332.e1. CrossRef
ANALYSIS OF THE CLINICAL EFFICIENCY OF RESTORATIVE FILLING MATERIALS
Valentina I. Kolodkina
Kuban Scientific Medical Bulletin.2019; 26(2): 64. CrossRef
Inhibitory effect of Bacillus velezensis on biofilm formation by Streptococcus mutans
Yesol Yoo, Dong-Ho Seo, Hyunjin Lee, Eui-Sang Cho, Nho-Eul Song, Tea Gyu Nam, Young-Do Nam, Myung-Ji Seo
Journal of Biotechnology.2019; 298: 57. CrossRef
Effectiveness of the DHMAI monomer in the development of an antibacterial dental composite
Fatima Zohra Cherchali, Mohamed Mouzali, Jean Bernard Tommasino, Dominique Decoret, Nina Attik, Hazem Aboulleil, Dominique Seux, Brigitte Grosgogeat
Dental Materials.2017; 33(12): 1381. CrossRef

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Orthodontic bracket bonding to glazed full-contour zirconia: Ji-Young Kwak, Hyo-Kyung Jung, Il-Kyung Choi, Tae-Yub Kwon; Restor Dent Endod 2016;41(2):106-113. Published online April 14, 2016; DOI: https://doi.org/10.5395/rde.2016.41.2.106

Abstract PDF PubReader ePub

Objectives

This study evaluated the effects of different surface conditioning methods on the bond strength of orthodontic brackets to glazed full-zirconia surfaces.

Materials and Methods

Glazed zirconia (except for the control, Zirkonzahn Prettau) disc surfaces were pre-treated: PO (control), polishing; BR, bur roughening; PP, cleaning with a prophy cup and pumice; HF, hydrofluoric acid etching; AA, air abrasion with aluminum oxide; CJ, CoJet-Sand. The surfaces were examined using profilometry, scanning electron microscopy, and electron dispersive spectroscopy. A zirconia primer (Z-Prime Plus, Z) or a silane primer (Monobond-S, S) was then applied to the surfaces, yielding 7 groups (PO-Z, BR-Z, PP-S, HF-S, AA-S, AA-Z, and CJ-S). Metal bracket-bonded specimens were stored in water for 24 hr at 37℃, and thermocycled for 1,000 cycles. Their bond strengths were measured using the wire loop method (n = 10).

Results

Except for BR, the surface pre-treatments failed to expose the zirconia substructure. A significant difference in bond strengths was found between AA-Z (4.60 ± 1.08 MPa) and all other groups (13.38 ± 2.57 - 15.78 ± 2.39 MPa, p < 0.05). For AA-Z, most of the adhesive remained on the bracket.

Conclusions

For bracket bonding to glazed zirconia, a simple application of silane to the cleaned surface is recommended. A zirconia primer should be used only when the zirconia substructure is definitely exposed.

Citations

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Evaluation of Different Surface Roughening Techniques on Clear Aligner Attachments Bonded to Monolithic Zirconia: In Vitro Study
Nehal F Albelasy, Ahmad M Hafez, Abdullah S Alhunayni
The Journal of Contemporary Dental Practice.2025; 25(12): 1104. CrossRef
An Innovative Method of Permanent Retention on Veneered Crowns
Yugandhar Garlapati, Sampath Krishna Veni, Jashva Vamsi Kogila, Polisetty Siva Krishna, K. N. Anand Kumar
Journal of Indian Orthodontic Society.2025;[Epub] CrossRef
Effect of Different Primers on the Shear Bond Strength of Orthodontic Brackets Bonded to Reinforced Polyetheretherketone (PEEK) Substrate
Ahmed Akram EL-Awady, Khaled Samy ElHabbak, Hussein Ramadan Mohamed, Ahmed Elsayed Elwan, Karim Sherif Adly, Moamen Ahmed Abdalla, Ehab Mohamed Kamal, Ahmed Leithy Alameldin
Dentistry Journal.2024; 12(6): 188. CrossRef
The Effect of Various Lasers on the Bond Strength Between Orthodontic Brackets and Dental Ceramics: A Systematic Review and Meta-Analysis
Seyed Ali Mosaddad, Jaafar Abduo, Mehrnaz Zakizade, Hamid Tebyaniyan, Ahmed Hussain
Photobiomodulation, Photomedicine, and Laser Surgery.2024; 42(1): 20. CrossRef
Shear Bond Strength of Clear Aligner Attachment Using 4-META/MMA-TBB Resin Cement on Glazed Monolithic Zirconia
Kasidit Nitasnoraset, Apiwat Riddhabhaya, Chidchanok Sessirisombat, Hitoshi Hotokezaka, Noriaki Yoshida, Irin Sirisoontorn
Polymers.2024; 16(14): 1988. CrossRef
Orthodontic bonding in special circumstances
Angus Burns, Annie Hughes, Michael O’Sullivan
British Dental Journal.2024; 237(5): 400. CrossRef
Bonding Effectiveness of Saliva-Contaminated Monolithic Zirconia Ceramics Using Different Decontamination Protocols
Necla Demir, Ozge Genc, Ipek Balevi Akkese, Meral Arslan Malkoc, Mutlu Ozcan, Konstantinos Michalakis
BioMed Research International.2024; 2024: 1. CrossRef
Comparison of shear bond strength of metallic orthodontic brackets bonded to zirconia models underwent different surface conditioning methods and different primer systems
Amena Raafat Khaled, Enas Talb Al-Jwary
APOS Trends in Orthodontics.2024; 0: 1. CrossRef
Shear bond strength and ARI scores of metal brackets to glazed glass ceramics and zirconia: an in vitro study investigating surface treatment protocols
Claire Pédemay, Philippe François, Vincent Fouquet, Sarah Abdel-Gawad, Jean-Pierre Attal, Claire-Adeline Dantagnan
BMC Oral Health.2024;[Epub] CrossRef
Mechanical and chemical surface treatment enhances bond strength between zirconia and orthodontic brackets: an in vitro study
Nareudee Limpuangthip, Atikom Surintanasarn, Ploylada Vitavaspan
BDJ Open.2023;[Epub] CrossRef
Shear bond strength of orthodontic brackets bonded to a new version of zirconium all ceramic restoration: An in vitro comparative study
Assem Abd EL-wahab, Marwa Shamaa, Ahmed Hafez, Noha El-Wassefy, Shaza Hammad
Heliyon.2023; 9(5): e16249. CrossRef
Evaluation of the effects of different composite materials and surface roughening techniques in bonding attachments of clear aligner on monolithic zirconia
Semiha Arslan, Hamiyet Kilinc
Orthodontics & Craniofacial Research.2023; 26(4): 546. CrossRef
Effect of Different Types of Adhesive Agents on Orthodontic Bracket Shear Bond Strength: A Cyclic Loading Study
Irfan Eser, Orhan Cicek, Nurhat Ozkalayci, Mehmet Yetmez, Hande Erener
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Bracket Bonding to All-Ceramic Materials with Universal Adhesives
Cecilia Goracci, Giuseppe Di Bello, Lorenzo Franchi, Chris Louca, Jelena Juloski, Jovana Juloski, Alessandro Vichi
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Effects of Three Novel Bracket Luting Agents Containing Zirconia Primer on Shear Bond Strength of Metal Orthodontic Brackets Attached to Monolithic Zirconia Crowns: A Preliminary In Vitro Study
Milad Shamohammadi Heidari, Mehrnaz Moradinejad, Hamed Tabatabaei, Vahid Rakhshan, Dinesh Rokaya
International Journal of Dentistry.2022; 2022: 1. CrossRef
Does Surface Treatment With Different Primers Increase The Shear Bond Strength Between Metallic Bracket and Monolithic Zirconia?
Emine Begüm BÜYÜKERKMEN, Ayşe Selenge AKBULUT, Murat KEÇECİ
Selcuk Dental Journal.2022; 9(2): 451. CrossRef
Effect of different primer agents on shear bond strength of ceramic orthodontic brackets bonded to zirconia ceramics
Ebru Kucukkaraca, Canan Akay
Journal of the Australian Ceramic Society.2022; 58(2): 645. CrossRef
Shear Bond Strength of Polypropylene Fiber in Orthodontic Adhesive on Glazed Monolithic Zirconia
Dhanabhol Riowruangsanggoon, Apiwat Riddhabhaya, Nattisa Niyomtham, Irin Sirisoontorn
Polymers.2022; 14(21): 4627. CrossRef
Bond Integrity and Surface Topography of Orthodontic Metal Brackets to Ceramic and Polymer-Based Restorations. An In-Vitro Study Design
Ali Alqerban
Science of Advanced Materials.2021; 13(4): 650. CrossRef
The effect of surface treatment and thermocycling on the shear bond strength of orthodontic brackets to the Y-TZP zirconia ceramics: A systematic review
Tamzid AHMED, Nashid FAREEN, Mohammad Khursheed ALAM
Dental Press Journal of Orthodontics.2021;[Epub] CrossRef
Orthodontic Bonding: Review of the Literature
Ali H. Alzainal, Ahmed Shehab Majud, Abdulfatah M. Al-Ani, Adil O. Mageet
International Journal of Dentistry.2020; 2020: 1. CrossRef
Shear bond strength between orthodontic metal brackets and Y-TZP according to the various ceramic surface treatments before and after thermocycling
Ji-Bong Choi, Seon-Mi Byeon
Korean Journal of Dental Materials.2020; 47(2): 83. CrossRef
Bond Strength and Failure Pattern of Orthodontic Tubes Adhered to a Zirconia Surface Submitted to Different Modes of Application of a Ceramic Primer
Francisco da Silva Araújo Milagres, Dauro Douglas Oliveira, Giordani Santos Silveira, Emanuelle de Fátima Ferreira Oliveira, Alberto Nogueira da Gama Antunes
Materials.2019; 12(23): 3922. CrossRef
Shear bond strength of orthodontic brackets bonded to a new all-ceramic crown composed of lithium silicate infused with zirconia: An in vitro comparative study
Ryan Gardiner, Richard Ballard, Qingzhao Yu, Edwin Kee, Xiaoming Xu, Paul Armbruster
International Orthodontics.2019; 17(4): 726. CrossRef
Comparison of bond strengths of ceramic brackets bonded to zirconia surfaces using different zirconia primers and a universal adhesive
Ji-Yeon Lee, Jaechan Ahn, Sang In An, Jeong-won Park
Restorative Dentistry & Endodontics.2018;[Epub] CrossRef

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Effective application duration of sodium ascorbate antioxidant in reducing microleakage of bonded composite restoration in intracoronally-bleached teeth: Jae-Young Park, Tae-Yub Kwon, Young-Kyung Kim; Restor Dent Endod 2013;38(1):43-47. Published online February 26, 2013; DOI: https://doi.org/10.5395/rde.2013.38.1.43

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Objectives

The aim of this study was to determine an appropriate application duration of sodium ascorbate (SA) antioxidant gel in reducing microleakage of bonded composite restoration in intracoronally-bleached teeth.

Materials and Methods

Eighty endodontically-treated human incisors were randomly divided into eight groups: control, no bleaching; IB and DB, immediate and delayed bonding after bleaching, respectively; S10m, S60m, S24h, S3d and S7d, bleaching + SA gel for 10 min, 60 min, 24 hr, 3 day and 7 day, respectively. For bleaching, a mixture of 30% hydrogen peroxide and sodium perborate was applied for 7 day. All access cavities were restored using One-Step adhesive (Bisco Inc.) and then Aelite LS Packable composite (Bisco Inc.). The bonded specimens were subjected to 500 thermal cycles, immersed in 1% methylene blue for 8 hr, and longitudinally sectioned. Microleakage was assessed with a 0 - 4 scoring system and analyzed using nonparametric statistical methods (α = 0.05).

Results

Group IB showed a significantly higher microleakge than the control group (p = 0.006) and group DB a statistically similar score to the control group (p > 0.999). Although groups S10m, S60m, and S24h exhibited significantly higher scores than group DB (p < 0.05), the microleakage in groups S3d and S7d was statistically similar to that in group DB (p = 0.771, p > 0.999).

Conclusions

Application of SA gel for 3 day after nonvital bleaching was effective in reducing microleakage of composite restoration in intracoronally-bleached teeth.

Citations

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Effect of Herbal Antioxidant on Push-out Bond Strength of Resin-based Composite to Dentin after Intracoronal Bleaching: An In Vitro Study
Parinitha MS, Akshay G, Vidya G. Doddawad, Ashwini Tumkur Shivakumar, Sowmya Halasabalu Kalgeri
Journal of Pharmacology and Pharmacotherapeutics.2024;[Epub] CrossRef
Photon-Induced Photoacoustic Streaming Activation of the Postbleaching Antioxidant Application Rapidly Improves Bonding to Pulp Chamber Dentin
Nasibe Aycan Yilmaz, Hicran Dönmez Özkan
Photobiomodulation, Photomedicine, and Laser Surgery.2021; 39(4): 289. CrossRef
Hypericum perforatum L.: A Potent Antioxidant Source for the Treatment of Oxidized Dentin: An Experimental In Vitro Study
Nasibe Aycan Yilmaz, Rukiye Yavaser, Arife Alev Karagozler
Journal of Advanced Oral Research.2021; 12(1): 57. CrossRef
Influence of a short‐time antioxidant application on the dentin bond strength after intracoronal bleaching
Muhammet Karadas, Sezer Demirbuga
Microscopy Research and Technique.2019; 82(10): 1720. CrossRef
Composite resin shear bond strength on bleached dentin increased by 35% sodium ascorbate application
Tunjung Nugraheni, N Nuryono, Siti Sunarintyas, Ema Mulyawati
Dental Journal (Majalah Kedokteran Gigi).2017; 50(4): 178. CrossRef
Antioxidant therapy enhances pulpal healing in bleached teeth
Adriano Fonseca Lima, Marcelo Rocha Marques, Diana Gabriela Soares, Josimeri Hebling, Giselle Maria Marchi, Carlos Alberto de Souza Costa
Restorative Dentistry & Endodontics.2016; 41(1): 44. CrossRef
Influence of Ethanol Pretreatment on the Bonding of Resin Composite to Bleached Dentin
Ga-Eun Son, Tae-Yub Kwon, Young Kyung Kim
Korean Journal of Dental Materials.2015; 42(4): 279. CrossRef
Effect of 35% Sodium Ascorbate Treatment on Microtensile Bond Strength after Nonvital Bleaching
Jason R. Hansen, Kenneth J. Frick, Mary P. Walker
Journal of Endodontics.2014; 40(10): 1668. CrossRef
Pull-out bond strength of a self-adhesive resin cement to NaOCl-treated root dentin: effect of antioxidizing agents
Maryam Khoroushi, Marzieh Kachuei
Restorative Dentistry & Endodontics.2014; 39(2): 95. CrossRef

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Polymerization of dual cured composites by different thickness: Yun Ju Kim, Myoung Uk Jin, Sung Kyo Kim, Tae-Yub Kwon, Young Kyung Kim; J Korean Acad Conserv Dent 2008;33(3):169-176. Published online May 31, 2008; DOI: https://doi.org/10.5395/JKACD.2008.33.3.169

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The purpose of this study was to evaluate the effect of thickness, filling methods and curing methods on the polymerization of dual cured core materials by means of microhardness test.

Two dual cured core materials, MultiCore Flow (Ivoclar Vivadent AG, Schaan, Liechtenstein) and Bis-Core (Bisco Inc., Schaumburg, IL, USA) were used in this study. 2 mm (bulky filled), 4 mm (bulky filled), 6 mm (bulky and incrementally filled) and 8 mm (bulky and incrementally filled)-thickness specimens were prepared with light cure or self cure mode. After storage at 37℃ for 24 hours, the Knoop hardness values (KHN) of top and bottom surfaces were measured and the microhardness ratio of top and bottom surfaces was calculated. The data were analyzed using one-way ANOVA and Scheffe multiple comparison test, with α = 0.05.

The effect of thickness on the polymerization of dual cured composites showed material specific results. In 2, 4 and 6 mm groups, the KHN of two materials were not affected by thickness. However, in 8 mm group of MultiCore Flow, the KHN of the bottom surface was lower than those of other groups (p < 0.05). The effect of filling methods on the polymerization of dual cured composites was different by their thickness or materials. In 6 mm thickness, there was no significant difference between bulk and incremental filling groups. In 8 mm thickness, Bis-Core showed no significant difference between groups. However, in MultiCore Flow, the microhardness ratio of bulk filling group was lower than that of incremental filling group (p < 0.05). The effect of curing methods on the polymerization of dual cured composites showed material specific results. In Bis-Core, the KHN of dual cured group were higher than those of self cured group at both surfaces (p < 0.05). However, in MultiCore Flow, the results were not similar at both surfaces. At the top surface, dual cured group showed higher KHN than that of self cured group (p < 0.05). However, in the bottom surface, dual cured group showed lower value than that of self cured group (p < 0.05).

Citations

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Effect of curing modes on micro-hardness of dual-cure resin cements
Ki-Deok Lee, Se-Hee Park, Jin-Woo Kim, Kyung-Mo Cho
Journal of Korean Academy of Conservative Dentistry.2011; 36(2): 132. CrossRef

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