Effect of Various Exposure Methods on Shear Bond Strength of Composite Veneers to Enamel and Dentin (in-vitro)

Abbasi, Mehdi and Sadeghi, Mostafa (2018) Effect of Various Exposure Methods on Shear Bond Strength of Composite Veneers to Enamel and Dentin (in-vitro). Journal of Mashhad Dental School, 42 (3). pp. 237-229.

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Abstract

Introduction: Composite veneers are used as a conservative and cosmetic treatment for discolored and deformed teeth or defective restorations. Due to the effect of various exposure methods on polymerization shrinkage stress, this study aimed to investigate the effect of various treatment techniques on shear bond strength of composite veneers restoration. Materials and Methods: In this in-vitro study, 72 premolar teeth were divided equally into enamel and dentin groups. The buccal surfaces in each groups were abraded to reach flat enamel or dentin surfaces. The specimens were mounted in acrylic cubs and bonding procedures were performed using Single Bond 2M1 . The specimens were divided into three subgroups according to the methods of exposure including conventional, soft-start, and pulse-delay techniques. In each subgroup, a composite cylinder was formed on buccal surfaces using Z250 composite M2 and different curing modes. The shear strengths were measured and the data were analyzed using one-way analysis of variance followed by Tukey multiple comparisons test (α=0.05). Results: There was no significant difference in shear strength of composite to enamel between enamel subgroups (P=0.185). However, the difference in shear strength of composite to dentin between dentin subgroups was significant (P=0.042). Adhesive failures were the most among all subgroups. Conclusion: Curing with soft-start and pulse-delay methods can increase shear strength in both enamel and dentin surfaces. Nevertheless, it is more effective in dentin surfaces.

Item Type: Article
Subjects: WU Dentistry. Oral surgery
Divisions: Journals > Journal of Mashhad Dental School
Depositing User: jmds jmds
Date Deposited: 10 Oct 2018 06:57
Last Modified: 10 Oct 2018 06:57
URI: http://eprints.mums.ac.ir/id/eprint/10503

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