| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1995: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1994: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1993: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Research Abstract |
The dimensional changes of denture base of maxillary removable partial denture (Kennedy class I modification 1) and mandibular removable partial denture (Kennedy class I modification 1) following polymerization were examined. These removable partial dentures were made from three different denture base resins (heat-cured, pour-type, microwave-cured). The dimensional changes of the denture base were measured by using the three-dimensional measurement system over a period of 4 weeks.
The maxillary dentures shrank toward the center of the denture immediately after deflasking. These dentures showed the linear shrinkage of 0.38% to 0.54% for the heat-cured, 0.23% to 0.52% for the pour-type, and 0.34% to 0.40% for the microwave-cured resin. After deflasking up until 4 weeks, the heat-cured maxillary dentures, except alveolar groove, gradually expanded. The pour-type maxillary dentures gradually expanded and reached the original model size, but the buccal flange continued to shrink toward mucosa surface of denture. The microwave-cured maxillary dentures gradually expanded.
Immediately after deflasking, the heat-cured mandibular dentures showed the linear shrinkage of 0.37% to 0.59%. The pour-type mandibular dentures showed the linear shrinkage of 0.16% to 0.30%, but the lingual flange showed the linear expansion of 0.08%. The microwave-cured mandibular dentures showed the linear shrinkage of 0.30% to 0.68%. After deflasking up to 4 weeks, the heat-cured and the microwave-cured mandibular dentures gradually expanded, but these dimensions did not reach the originalmodel size. The pour-type mandibular dentures gradually expanded, and their dimensions reached the original model size, but the lingual flange showed the linear expansion of 0.65%.
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