Abstract
The adaptability of a cobalt-chromium cast plate denture constructed by a controlled polymerization system, that is a DS-system, was investigated in comparison with that constructed by autopolymerization and heat polymerization. The heat polymerization was carried out in a water bath at 70℃ for 24 hours, and at 70℃ for 40 minutes and then at 100℃ for 30 minutes.
The cobalt-chromium cast plate had a bending elastic modulus of 23, 000 kgf/mm2. Discrepancy of the dentures constructed by the DS-system to stone cast was about 0.10 mm at the median line and denture border of the dentures. The 0.1 mm discrepancy was equal to one-half or one-third the discrepancy of the dentures constructed by other polymerization methods. Compared with other polymerization methods for adaptability, the DS-system was advantageous. Although the discrepancy after the unilateral occlusion test increased, the DS-system gave the smallest increment of the discrepancy among these polymerization methods.
