Shear bond strength of different types of adhesive systems to dentin and enamel of deciduous teeth in vitro.

Abstract

The present study aimed to evaluate the suitability of self-etch adhesives for restoration of deciduous teeth compared with etch and rinse approaches. One hundred twenty primary teeth were divided into five groups, each being assigned to an adhesive system. Self-etch adhesives XenoV (XV) and Clearfil S(3) Bond (CB), Prime&Bond NT with (PBE)/without preliminary etching (PBN), and Optibond FL (OBFL) as an etch and rinse system were included. Enamel and dentin specimens were prepared (n=36/group), adhesives applied, and compomer cylinders polymerized. After 24-h storage in 37°C distilled water and thermo-cycling (1440cycles, 5/55°C, 27s), shear bond tests and fracture mode classification based on SEM investigation were performed. Statistical analysis involved ANOVA and Scheffé procedure with Bonferroni-Holm correction (p≤0.005). High shear bond strengths to primary enamel were determined for PBE (mean [M]=22.48±7.7MPa)>OBFL (M=19.06±5.62MPa)>CB (M=17.6±6.55MPa), and XV (M=16.85±5.38MPa) and PBN (M=8.26±4.46MPa) formed significantly less reliable enamel-resin interfaces (p≤0.005). PBE generated the highest bond strength on primary dentin (M=21.97±8.02MPa); significantly lower values were measured for XV (M=13.44±5.43MPa) and OBFL (M=12.92±4.31MPa) (p≤0.005). Adhesives requiring preliminary etching ensure optimal bond strength to primary enamel. If separate etching is to be avoided, selected self-etch adhesives obtain acceptable shear bond values on primary enamel and dentin. The treatment of pediatric patients presents a great challenge in dental practice, and optimization of treatment processes is important.