Abstract
Purpose: The purpose of this study was to establish the proper usage of an autopolymerizing resin which is the optimum application requirement in early hardening pursued at the initial stage of the autopolymerizing resin using barbituric acid derivatives.
Methods: The shear bond strength of specimens was measured by the change of various polymerization conditions of exposure time, the dipping time and warm water temperature after the autopolymerizing resin identical to that of the autopolymerizing resin block was put on the brush. The plane of the broken surface was observed in the scanning electron microscopic image, and in addition, the rupture condition was classified by visual observation. The classification of the failure patterns was interface failure, cohesion failure and mixing failure.
Results and Conclusion: The shear bond strength increased according to the rise in water temperature in dipping time of 30 seconds, 45 seconds and 60 seconds. It was confirmed that the optimum technical service condition was 60-second dipping time in warm water (temperature of 50°C) and that shear bond strength is about 10 MPa. It proved advantageous to stiffen the autopolymerizing resin using a barbituric acid derivative. It was also confirmed that sufficient stiffening occurred in warm water to decrease the residual monomer.
