Abstract
Photocurable bonding liners for dentin were studied. The liners contained d, l-camphor quinone (CQ) as a photosensitizer, N-phenylglycine (NPG) as a reducing agent instead of N, N-dimethyul aminoethyl methacrylate (DMAEMA), and 4-methacryloxyethyl trimellitate (4-MET), 2-hydoroxy-3-phenoxypropyl methacrylate (HPPM) or 2-methacryroxyethyl p-methoxyphenyl phosphoric acid (CH3O〜OH) as an adhesion promoting monomer. Bovine dentin was pretreated with 0.5 M EDTA・2Na solution (EDTA5-0) or 0.3 M EDTA・2Na-0.2M EDTA・Fe・Na solution (EDTA3-2) for 60 sec. The tensile bond strength of CQ・NPG・4-MET liner to bovine dentin with EDTA3-2 was 8.4 MPa and that of CQ・NPG・CH3O〜OH liner was 8.6 MPa. However, CQ・NPG・HPPM liner did not improve adhesion. The findings indicate that NPG acts as a reducing agent in photocuring system and that the combination of CQ, NPG and an acidic monomer (like 4-MET, CH3O〜OH) achieved good polymerization of the liner.
