Abstract
Adhesive strengths and physical properties of two different new autopolymerized resins have been studied for the prosthetic clinical application. New resins are divided into two types, MB-3 for denture repair resin and MB-4 used for relining of metal based denture. MB-3 and MB-4 are composed of three components, a bonding liner, a liquid and a powder. The bonding liner contains 7wt% 4-META in MMA-solvent. Liquid and powder consist of MMA and Poly-MMA the same as conventional cold-curing resins. Adhesive strength of MB-3 to the Co-Cr alloy was 155±15 kg/cm2 after 90 days immersion in 37°C water, and 106±20 kg/cm2 after 3, 000 thermal cycles. Setting time of MB-3 was 4′30′, slightly slow as compared with Unifast, but other physical properties, brinell hardness, water sorption and color stability were almost the same as the contrast. MB-4 showed physical properties approximately similar to those of Rebaron. MB-3 indicated no acute toxity and no deposit from the boiling water solution of bowl milled specimen. It was concluded from the results that two different new resins were acceptable in a clinical application.