The impact of three desensitizing materials on the shear strength between composite resin and dentin: an in-vitro study.

BACKGROUND: The study investigated the effect of three commercially available desensitizers on the shear bond strength (SBS) of two bulk fill composites and a conventional composite resin to dentin. METHODS AND METHODS: The study utilized 144 freshly extracted, caries free maxillary premolar teeth. The dentin surfaces of all the teeth were exposed and etched with 37% phosphoric acid for 15 s, rinsed with water and dried. Three main groups were made consisting of 48 teeth in each group, Group 1, 2, and 3. Each main group (Groups 1, 2, and 3) had 4 subgroups consisting of 12 teeth each depending upon the desensitizer used (Subgroup A-No desensitizer or control, Subgroup B-Gluma Dentin desensitizer, Subgroup C-Shield force Plus desensitizer, and Subgroup D-Telio CS desensitizer). As per the manufacturer’s instructions, the different dentin desensitizers were applied in all the test subgroups. With the help of a silicon mold, Group 1 received Bulk fill packable composite resin, Group 2 received Bulk fill flowable composite resin, and Group 3 received Conventional / Incremental composite resin to complete the sample preparation and shear bond test was performed. The parametric two-way Analysis of Variance (ANOVA) test with interaction design was applied and Tukey’s multiple Posthoc procedures were carried out for pairwise comparisons. A 95% confidence range was used to determine statistical significance for p ≤ 0.05. RESULTS: Highest SBS was seen in Shield force Plus desensitizer groups (16.47 Megapascals (MPa)) and Telio desensitizer groups showed the least SBS values (14.07 MPa). Bulk fill packable composite groups showed highest SBS (15.90 MPa) while Bulk fill flowable composite groups had least SBS values (14.75 MPa). CONCLUSIONS: Since these three desensitizers can both strengthen the bond between composite resins and dentin, and reduce dentin hypersensitivity following composite restorations as per the earliar studies, clinicians should consider using them before placing composite restorations. CLINICAL TRIAL NUMBER: Not applicable.