Volume 10, Issue 2 (6-2025)
J Res Dent Maxillofac Sci 2025, 10(2): 144-151 |
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Ethics code: IR.SBMU.RIDS.REC.1396.608
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Farahiparizi S, Tabari K, Torabzadeh H, Panahandeh N. Flexural Strength and Microshear Bond Strength of Conventional and Flowable Composite Resins to Dentin. J Res Dent Maxillofac Sci 2025; 10 (2) :144-151
URL: http://jrdms.dentaliau.ac.ir/article-1-774-en.html
URL: http://jrdms.dentaliau.ac.ir/article-1-774-en.html
1- Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
2- Department of Restorative Dentistry, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
3- Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran. ,nargespanahandeh@yahoo.com
2- Department of Restorative Dentistry, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
3- Dental Research Center, Research Institute of Dental Sciences, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran. ,
Abstract: (48 Views)
Background and Aim: This study aimed to evaluate the flexural strength (FS) and microshear bond strength (µSBS) of conventional and flowable composite resins to dentin.
Materials and Methods: This in vitro study was conducted on composite specimens fabricated from Filtek Z250 and Clearfil AP-X Esthetics (CE) conventional, and Clearfil AP-X Esthetics Flow (CEF) and Clearfil AP-X Flow (CF) flowable composite resins in 4 groups (n=10). The specimens underwent a 3-point bending test for measurement of their FS. For assessment of µSBS, dentin discs with 2 mm thickness were obtained from the coronal third of the crowns of 20 extracted premolars. Composite resins were bonded to dentin discs in Tygon tubes (1 mm height, 0.7 mm internal diameter) using Tetric N-Bond 5th generation bonding agent, and a universal testing machine measured their µSBS. Data were analyzed by ANOVA and Tukey test (alpha=0.05).
Results: Z250 showed a significantly higher FS than CEF (P=0.002); no other significant difference was found in FS. The two conventional composites (P=0.847) and the two flowable composites (P=0.575) had no significant difference with each other in µSBS. However, the conventional composites had a significantly higher µSBS than the flowable composites (P<0.001).
Conclusion: The FS of CEF was significantly lower than that of Z250, and comparable to that of other tested composite resins. All tested composites had a FS higher than 80 MPa recommended by ISO-4049 for restorations under occlusal forces. Both CEF and CF showed significantly lower µSBS than the tested conventional composite resins.
Materials and Methods: This in vitro study was conducted on composite specimens fabricated from Filtek Z250 and Clearfil AP-X Esthetics (CE) conventional, and Clearfil AP-X Esthetics Flow (CEF) and Clearfil AP-X Flow (CF) flowable composite resins in 4 groups (n=10). The specimens underwent a 3-point bending test for measurement of their FS. For assessment of µSBS, dentin discs with 2 mm thickness were obtained from the coronal third of the crowns of 20 extracted premolars. Composite resins were bonded to dentin discs in Tygon tubes (1 mm height, 0.7 mm internal diameter) using Tetric N-Bond 5th generation bonding agent, and a universal testing machine measured their µSBS. Data were analyzed by ANOVA and Tukey test (alpha=0.05).
Results: Z250 showed a significantly higher FS than CEF (P=0.002); no other significant difference was found in FS. The two conventional composites (P=0.847) and the two flowable composites (P=0.575) had no significant difference with each other in µSBS. However, the conventional composites had a significantly higher µSBS than the flowable composites (P<0.001).
Conclusion: The FS of CEF was significantly lower than that of Z250, and comparable to that of other tested composite resins. All tested composites had a FS higher than 80 MPa recommended by ISO-4049 for restorations under occlusal forces. Both CEF and CF showed significantly lower µSBS than the tested conventional composite resins.
Type of Study: Original article |
Subject:
Restorative Dentistry
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