Moist vs over-dried etched dentin: FE-SEM/TEM and bond strength evaluation of resin-dentin interfaces produced by universal adhesives

Author(s)

Kumagai, Rose Y. ; Hirata, Ronaldo ; Pereira, Patricia N. R. ; Reis, Andre F.

• Document type: Journal article
• Source: Journal of Esthetic and Restorative Dentistry; v. 32, n. 3, p. 8-pg., 2019-10-17.

Abstract

Objective To evaluate the influence of the degree of dentin moisture on interfacial ultramorphology and bond strength (mu TBS) of universal adhesives. Materials and Methods Futurabond U (FBU), Scotchbond Universal (SBU), Adhese Universal (ADU), and Prime&Bond active (PBA) were used. After acid-etching, moist or over-dried dentin surfaces were tested. Teeth were restored for scanning and transmission electron microscopy (n = 3) and mu TBS evaluation (n = 5). mu TBS results were analyzed by two-way ANOVA and Tukey. Results For moist dentin, a well-formed hybrid layer (HL) was observed. However, when applied to over-dried dentin, remarkable differences were observed. Defects, gaps, and reduced HL thickness were observed mainly for ADU and FBU. When applied to wet dentin, mu TBS values were similar for all adhesives, except for FBU, which was significantly lower. When applied to over-dried dentin, PBA presented the highest mu TBS values, followed by SBU, ADU, and FBU. ADU presented significantly lower mu TBS when applied to over-dried dentin. Conclusion PBA, SBU, and FBU mu TBS values were not sensitive to the degree of moisture. Even though application to over-dried dentin revealed defects, gaps and reduced HL thickness for SBU, ADU, and FBU, mu TBS analysis only revealed a significant reduction for ADU. Clinical Significance Universal adhesives can be applied in either self-etching or etch-and-rinse mode. However, clinicians are not aware which universal adhesives should be strictly applied on a moist dentin for bonding in the etch-and-rinse mode. (AU)

• FAPESP's process: 07/06083-4 - Long-term evaluation of the bond strength, nanoleakage patterns and ultramorphological characteristics of resin-dentin interfaces produced by self-adhesive cements
• Grantee: André Figueiredo Reis
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/23401-3 - Development of monomeric blends containing methacrylates with elastomeric behavior in association with photoinitiated alternative systems for application in dental materials
• Grantee: André Figueiredo Reis
• Support Opportunities: Regular Research Grants
• FAPESP's process: 09/16261-2 - Effects of intrapulpal pressure on the long-term bond strength and nanoleakage of resin-dentin interfaces produced by self-adhesive cements: an in vitro study
• Grantee: André Figueiredo Reis
• Support Opportunities: Regular Research Grants