Abstract
The adaptability of pure titanium cast plate dentures constructed by a DS system was investigated in comparison with that constructed by autopolymerization and two kinds of heat polymerization.
The bending proportional limit and elastic modulus of the titanium cast plate was about 68.4 kgf/mm2 and 12400 kgf/mm2, respectively. The titanium cast plate had a Knoop hardness number of about 250 at over the whole cross section. The discrepancy at the median line of the dentures constructed by the DS system to stone cast decreased with an increase in thickness of the titanium cast plate. The discrepancy of the dentures was correlated with the thickness of the plate. The titanium cast plate dentures, when constructed by the DS system, had a discrepancy of about 0.10 mm at the median line. However, the discrepancy of the dentures, when constructed with other polymerization methods, was about 2 or 3 times larger than that of the dentures constructed by the DS system. The discrepancy at the median line and the denture border constructed by the DS system was less than 0.10 mm after the unilateral occlusion test. However, the discrepancy of the dentures constructed by other polymerization methods was 2 or 3 times that of the dentures before the unilateral occlusion test.
