Development of Bonding System for Resin Core Construction by MωA Adhesive

Abstract

We designed self-etching primers consisting of a series of four N-methacryloyl-ω-amino acids, MωA, of different methylene chain numbers for resin core construction. The interacted amount of MωA's carboxylic acid with root or crown dentin apatite was determined, and its effects on dentin bond durability examined.
The addition of both dentin particles to the MωA solutions caused the carbonyl carbon peak of carboxylic acid in MωA to shift to a lower field, chiefly because of an acid-base interaction between carboxylic acid and calcium. Then, as the pKa value of MωA's carboxylic acid increased, the amount of carboxylic acid that interacted with calcium decreased. In terms of dentin bonding durability, the four tested MωA adhesives provided noticeably higher bond strengths of resin to root or crown dentin than ED Primer II. Therefore, from the perspective of restoring pulpless teeth with minimal intervention, carboxylated MωA adhesives seemed to be very useful as functional monomers for self-etching primers.