Bond Strength of Bulk-Fill Resin Repairs: Impact of Surface and Adhesive Protocols
DOI:
https://doi.org/10.15517/4tjc3431Keywords:
Bulk fill; Resin; Composite; Surface treatment; Silane; Repair.Abstract
Although repair is a conservative approach that preserves healthy tooth structure, there is still no consensus on the most effective surface treatment and adhesive protocol for repairing aged bulk-fill composite resin restorations. The objective of the study was to evaluate the effect of diamond bur roughening and aluminum oxide (Al2O3) sandblasting as surface treatments combined with different adhesive protocols on the repair bond strength (BS) of aged bulk-fill composite resin.150 Filtek™ One resin discs were thermocycled (5,000 cycles of 5°/55°C) and divided into three surface treatment groups (n=50): no treatment (NT), roughening with diamond bur (B), and sandblasting with Al2O3 (Al). Each group was further subdivided according to five adhesive protocols (n=10): no adhesive (NA), Adper Single Bond 2 (SB), Single Bond Universal (SBU), Silane + Adper Single Bond 2 (S+SB), and Silane (S). Three Bulk Fill resin cylinders were fabricated for each specimen to simulate repair, followed by micro-shear bond strength testing and fracture pattern analysis after 24-hour storage in deionized water. Two-way ANOVA and Tukey's test (α=0.05) were applied. When B or Al was applied, only NA showed inferior results. No statistical differences were found between B/SB, B/SBU, B/S+SB, and B/S, as well as between Al/SB, Al/SBU, Al/S+SB, and Al/S. Al/SBU showed higher bond strength than B/SBU. The most frequent fracture patterns for B and Al were cohesive and mixed, while for NT, it was adhesive. Surface treatment with B or Al, combined with an adhesive protocol, improved bond strength. Surface treatment is crucial for bulk-fill composite resin repair, enhancing bond strength with adhesive systems, with or without silane. A universal adhesive containing silane is as effective as adhesive-silane combinations, offering superior bond strength on Al2O3 blast-treated surfaces.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Grant numbers Protocol No. 88882.376603/2019-01
