Bonding Effectiveness of Bioactive Self-Adhesive Restorative Material to Enamel and Dentin Using Different Bonding Protocols

Abstract

Objective: To investigate microshear bond strength of bioactive restorative material to enamel and dentin bonded using universal adhesive in etch and rinse and self-etch mode stored for 24h and 6m. Methods: Sound bovine incisors were used in this study. ACITVA Bioactive Restorative (Pulpdent Corp., Watertown, MA, USA) and Single Bond Universal adhesive (3M ESPE, St.Paul, MN, USA) were used. Teeth were grouped into 6 groups according to tooth substrate (enamel and dentin) and bonding protocol (No bonding agent, bonding in etch and rinse mode and bonding in self-etch mode). Specimens were stored for either 24 h or 6 m. Microshear bond strength (µSBS) was tested using universal testing machine and micromorphological observation of the interface was investigated using ESEM. Data were tabulated and statistically analyzed using Two-way ANOVA followed by Bonferroni's post-hoc test. Results: Enamel bonded in etch and rinse mode recorded the highest µSBS values at both storage periods. Dentin at 24 h showed no significant difference between etch and rinse and selfetch modes while after 6 m, etch and rinse protocol showed significant drop. Control group recorded the lowest µSBS at all experimental groups. Conclusion: Use of bonding agents is recommended with ACITVA to both enamel and dentin. Universal adhesives are preferred in etch and rinse mode with enamel and self-etch mode with dentin. ACITVA is able to preserve bond strength upon storage except for dentin bonded in etch and rinse mode.

Effect of Incorporation of Hydroxyapatite Nanorods in Self-Etch Adhesive on Microtensile Bond Strength and Micromorphological Patterns of Resin/Dentin Interface

“…1 Many attempts have been made to improve the overall performance of the restoration by addressing difficulties associated with the tooth restoration interface. 2,3 Tooth restoration can be performed using dental adhesive technology, which is relies on the creation of the hybrid layer, a structure made up of demineralized collagen fibrils reinforced by a resin matrix. 4 However, the hybrid layer generated on the variable and dynamic organic dentin phase is not flawless, and it may fail with time, resulting in marginal discolorations, marginal leakage, and later composite restoration retention loss.…”