Abstract
Methacryloyloxy aliphatic carboxylic acid(MAC)with different methylene chain lengths were designed as primers.The effects of the methylene number in the MAC molecule on the strength of interaction between MAC and dentinal collagen, and on the bond strength of resin to acid-etched dentin were examined. The carboxylic acid and ester group in the MAC molecule interacted with dentinal collagen.The carboxylic acid group in the MAC molecule formed a stronger interraction with dentinal collagen than the ester group.The application of thermocycling decreased the strength of resin bond to etched dentin treated with MAC primer.However, the decrease in the bond strength to etched dentin primed with O-methacryloyl glycolic acid (MGA)was lower than that obtained with 3-methacryloyloxy propionic acid(MPA).This was due to the fact that MGA formed a stronger interaction with dentinal collagen than MPA.
