Strain Behavior in Heat Cured Resin during Curing

Abstract

Minimizing internal stress that occurs in heat cured resin is important in obtaining an accurate denture. I used a strain gauge and temperature sensor to investigate the relationship of strain and temperature during the curing of various thicknesses and shapes of resin exposed to different curing methods. The influence of flasking plaster was also investigated.
The following conclusions were obtained.
1) The behavior of strain was similar for a particular curing method, although the values for the strain differed.
2) The behavior of the strain and internal temperature were characteristic of the curing method.
3) The compressive strain was less in plaster than in dental stone when curing was by boiling water.
The strain was also less after deflasking. Strain was very dependent on thickness and shape of the specimen, as well as changes in temperature. Flasking plaster was also important. The system developed for this experiment was useful in measuring the strain and internal temperature in the heat cured resin.