Abstract
In an attempt to have a cavity liner that can adhere to tooth substance with no irritation to the pulp, 4-iodobutyl methacrylate-acrylic acid copolymer liner was prepared.A thin layer(10-20μm)of this hydrophilic cavity liner was applied, with a small brush, on human tooth dentine surface on which the smear layer had been previously removed by 1% EDTA solution.After the application of polycarboxylate cement(PCC)on the lined dentine surface, the adhesive strength between PCC and dentine was evaluated.Without the liner, the average adhesive strength of PCC to dentine was 0.0MPa and 90% of the destruction between dentine and PCC was interface failure.On the other hand, the average adhesive strength of PCC to the lined dentine was 0.6MPa and 90% of the destruction was a mixture of cohesive and interface failure.After the destroyed dentine surface was washed with distilled water, the sample was dried and prepared for scanning electron microscopic examination.In the case of PCC without the liner, the orifices of dentine tubles were exposed, while in that of PCC with the liner, most of the orifices of dentine tubles were sealed by cement.This cavity liner with pendant iodide is considered to react chemically with collagen.In addition, iodine is thought to be gradually released from this liner.
