Composite Resin for Dowel-Cores. Part VII. Effect of Various Pretreating Agents on Adhesive Strength of Composite Resin to the Dentin.

The adhesive strength of dual-cured composite resin for dowel-cores to the dentin treated with various combinations of pretreatment agents, primers and bonding agent, was measuredand compared with one another. In this study, four trial materials were used, that is 10% NaOClgel, tooth primer, paste-type PANA VIA and dual-cured composite resin.The following results were obtained.1. In all pretreatment agents, there were some combinations of primers and bonding agents, with which high adhesive strength was obtained.2. In consideration of the total treatment time, the combination of tooth primer and Clearfilphoto bond was evaluated to be the most desirable because of high adhesive strength and thereasonable treatment time of 100 sec.3. Paste-type PANAVIA tended to decrease the adhesive strength to the dentin.4. Cohesive failure in the dentin occured after compressive shear adhesive strength tests intwelve of fourteen combinations investigated.5. The SEM image of the dentin treated with tooth primer showed less demineralization thanthat of K-etchant gel.