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J Dent Res Dent Clin Dent Prospects. 2016;10(1): 9-16.
doi: 10.15171/joddd.2016.002
PMID: 27092209
PMCID: PMC4831615
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Original Research

Effect of different surface treatments on the shear bond strength of nanofilled composite repairs

Ghazaleh Ahmadizenouz 1*, Behnaz Esmaeili 1, Arnica Taghvaei 2, Zahra Jamali 3, Toloo Jafari 1, Farshid Amiri Daneshvar 4, Soraya Khafri 5

1 Assistant Professor, Department of Operative Dentistry, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran
2 Dental Student, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran
3 Assistant Professor, Department of Oral Medicine, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
4 Assistant Professor, Department of Prosthetic Dentistry, Faculty of Dentistry, Birjand University of Medical Sciences, Birjand, Iran
5 Assistant Professor, Department of Biostatistics and Epidemiology, Faculty of Medicine, Babol University of Medical Sciences, Babol, Iran
*Corresponding Author: Email: gazalehahmadidds@gmail.com

Abstract

Background. Repairing aged composite resin is a challenging process. Many surface treatment options have been proposed to this end. This study evaluated the effect of different surface treatments on the shear bond strength (SBS) of nano-filled composite resin repairs.Methods. Seventy-five cylindrical specimens of a Filtek Z350XT composite resin were fabricated and stored in 37°C distilled water for 24 hours. After thermocycling, the specimens were divided into 5 groups according to the following surface treatments: no treatment (group 1); air abrasion with 50-μm aluminum oxide particles (group 2); irradiation with Er:YAG laser beams (group 3); roughening with coarse-grit diamond bur + 35% phosphoric acid (group 4); and etching with 9% hydrofluoric acid for 120 s (group 5). Another group of Filtek Z350XT composite resin samples (4×6 mm) was fabricated for the measurement of cohesive strength (group 6). A silane coupling agent and an adhesive system were applied after each surface treatment. The specimens were restored with the same composite resin and thermocycled again. A shearing force was applied to the interface in a universal testing machine. Data were analyzed using one-way ANOVA and post hoc Tukey tests (P < 0.05).Results. One-way ANOVA indicated significant differences between the groups (P < 0.05). SBS of controls was significantly lower than the other groups; differences between groups 2, 3, 4, 5 and 6 were not significant. Surface treatment with diamond bur + 35% phosphoric acid resulted in the highest bond strength.Conclusion. All the surface treatments used in this study improved the shear bond strength of nanofilled composite resin used.
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Submitted: 03 Apr 2016
Accepted: 07 Apr 2016
ePublished: 07 Apr 2016
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