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VOLUME 3 , ISSUE 1 ( January-June, 2018 ) > List of Articles

RESEARCH ARTICLE

Comparative Evaluation of Different Surface Treatments on the Repair Shear Bond Strength of Three Nanohybrid Composites: An in vitro Study

Arvind K Alexander, R Mohana Priya, Sheerin Sarthaj, S Maria Antony

Keywords : Nanohybrid, Sand blasting, Shear bond strength, Silane coupling agent, Surface treatment

Citation Information : Alexander AK, Priya RM, Sarthaj S, Antony SM. Comparative Evaluation of Different Surface Treatments on the Repair Shear Bond Strength of Three Nanohybrid Composites: An in vitro Study. Cons Dent Endod J 2018; 3 (1):22-26.

DOI: 10.5005/jp-journals-10048-0034

License: CC BY-NC 4.0

Published Online: 01-01-2018

Copyright Statement:  Copyright © 2018 Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Aim: To evaluate the effects of different surface treatments on the repair bond strength of three different nanohybrid composites, namely conventional nanohybrid, bulk fill, and ceramicincorporated composites. Materials and methods: A split mold of height 5 × 5 mm in diameter was taken; 60 composite blocks were prepared based on three composites used. Group I: Kerr nanohybrid, group II: Tetric N-Ceram Bulk Fill, and group III: NanoCeram. Composite material was restored with incremental layering technique of 2 mm thickness. Aging of the composite blocks was achieved by storing them in distilled water for 1 week and then thermocycling. The samples were surface treated as subgroup A: sandblasting with silica particles, subgroup B: coarse grit diamond bur, subgroup C: etching with 10% hydrofluoric acid, and subgroup D: control group. Surface roughness of each surface-treated sample was evaluated using three-dimensional (3D) profilometer. A silane coupling agent and an adhesive agent were applied. Composite blocks were restored with the respective composite resins using a repair mold. A shearing force test was performed using universal testing machine. A load was applied to the interface at a crosshead speed of 0.5 mm/minute until fracture. Analyses were performed using analysis of variance (ANOVA) and post hoc Tukey test. Results: Highest shear bond strength was observed in composites surface treated with sandblasting followed by bur and hydrofluoric acid. The lowest shear bond strength was observed in the control group. Conclusion: Sandblasting surface treatment of Kerr composite manifested the highest bond strength, followed by Tetric N-Ceram and NanoCeram groups. Bur treatment of Tetric N-Ceram showed the higher bond strength values compared with the other groups. HF3 surface treatment of NanoCeram composite presented inferior bond strength values. Repair bond strength of aged nanohybrid resins could be improved with sandblasting, silane, and adhesive resin application compared with other surface treatments.


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