Bond strength and morphology of resin materials applied to the occlusal surface of primary molars

Abstract

Background: Hydrophilic adhesives may be used as pit and fissure sealants (sealants), but there is concern about the ability of self-etching adhesives to bond sealants to enamel.

Aim: To study the bond strength (BS) and morphology of adhesive systems used as sealants.

Design: OptiBond FL, OptiBond All-in-One, combined OptiBond All-in-One+OptiBond FL adhesive, and Fluroshield were applied to the occlusal surfaces of 16 primary molars (n = 4). Teeth were stored in distilled water (24 h at 37°C) and sectioned through the interface to obtain sticks (0.8 mm(2) ) tested under a tensile load (0.5 mm/min). Failure modes were observed. Data were analysed by ANOVA and Tukey's tests (α = 5%). The morphology of 12 primary molars was examined in terms of the etching pattern and resin reproduction.

Results: Differences in the BS were found (P = 0.001), with OptiBond FL showing the highest (36.84 ± 5.7 MPa), Fluroshield (24.26 ± 2.13 MPa) and OptiBond All-in-One (17.12 ± 4.97 MPa) similar, and OptiBond All-in-One + OptiBond FL adhesive the lowest (9.8 ± 2.94 MPA). OptiBond FL showed the best results in terms of morphology.

Conclusion: Under the conditions of this study, OptiBond FL was the best material to be used for sealing.