The gluma system for bonding to dentin: effect of acid pretreatment and surface wetness on bond strength

RESUMO

The aim of this study was to investigate the bond to dentin of a resin composite promoted by the Gluma bonding system applied to dry or wet dentin surfaces. The bonding system was modified as regards the conditioner and the composition of the primer. Various acidic conditioners were used, and the primer was modified by addition of water and acetone. Bond strengths between 12 and 22 MPa were recorded. It was concluded that bonds of good strength can be obtained with 20% phosphoric acid as pretreatment. It was further concluded that "moist" dentin does not interfere with bonding, but that "wet" dentin may reduce the bond strength about 25%