Effect of surface modification methods on dentin-resin bond strength after amalgam contamination: In-vitro study
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Background The aim of this study was to investigate the bond strength of resin composites to dentin surfaces following the removal of amalgam restorations. Methods Twenty-seven amalgam-restored molars were selected, and their amalgam restorations were removed. The exposed dentin surfaces were subjected to different surface treatments: ortho-phosphoric acid etching, sandblasting, and Er:YAG laser irradiation. Following surface treatment, the samples were divided into three subgroups and restored using different universal adhesives (Solare Universal Bond, Gluma Bond Universal, Scotchbond Universal Plus) and nanohybrid composite resins (G-aenial A'CHORD, Charisma Topaz, Filtek Z550). Microshear bond strength (µSBS) testing was conducted for each group. The data were statistically analysed using one-way analysis of variance (ANOVA) and Tukey’s post-hoc test. Results The highest bond strength was observed in the 3M subgroup (39.91 MPa) on laser-treated dentin surfaces, while the lowest bond strength was recorded in the Kulzer subgroup (3.61 MPa) on sandblasted surfaces. Conclusions Surface modification of amalgam-contaminated dentin, particularly with laser treatment, enhanced the adhesion of composite resin and yielded successful bond strength outcomes.
