Deformation of Maxillary Complete Dentures by Microwave Resin Polymerization
1993 Volume 56 Issue 1 Pages 45-64
Details
1993 Volume 56 Issue 1 Pages 45-64
We compared the deformation of maxillary complete dentures polymerized under conventional water bath curing and four different conditions of microwave irradiation.
In the regions where there artificial teeth, there was considerable deformation in the dentures polymerized by microwave irradiation due to large anterior/posterior shrinkage and small lateral shrinkage. However, there was little deformation in the dentures polymerized by conventional water bath curing.
In the alveolar ridge region, the deformation varied with conditions of microwave irradiation. There was little deformation in the dentures polymerized by three minutes of irradiation from the mucosal side. However, there was considerable deformation in the dentures polymerized by three minutes of irradiation from the occlusal surface side due to large anterior/posterior shrinkage. And there was considerable deformation in the dentures polymerized by conventional water bath curing.
In the denture border region, the deformation varied with conditions of microwave irradiation. There was little deformation in the dentures polymerized by three minutes of irradiation from the mucosal side. However, there was considerable deformation in the dentures polymerized by three minutes of irradiation from the occlusal surface side due to movement of the denture border around the canine. There was also considerable deformation in the dentures polymerized by conventional water bath curing due to movement of the denture border around the canine and maxillary tuberosity.
All of the dentures shrank. However, the shrinkage decreased between 7 and 30 days after polymerization by storage in water at 37℃.
The weight of the dentures decreased one day after polymerization, then increased for the next 30 days by storage in water at 37℃.
These results suggest that in regions where there are artificial teeth, the deformation of the dentures polymerized by microwave irradiation is larger than that of dentures polymerized by conventional water bath curing. In the mucosal regions, polymerization by microwave irradiation from the mucosal side produces a decrease in deformation.
