Because of the anatomical form of posterior teeth, the amount of tooth reduction at the cuspal area in the typical intracoronal cavity will be inevitably maximal, while stress development on the restoration in this area will be relatively minimal.
In...
Because of the anatomical form of posterior teeth, the amount of tooth reduction at the cuspal area in the typical intracoronal cavity will be inevitably maximal, while stress development on the restoration in this area will be relatively minimal.
In an attempt to decrease the amount of tooth reduction at the cuspal area, two modified cavities were newly designed in this study. They had a decreased pupal depth of 1mm at the cuspal area and offsets with the depth of 0.5 ~ 1.0mm were formed at the central fossa area. The Von Mises stresses developed in the gold restoratives and in the teeth were compared with that in the typical intracoronal cavity, which had a simple flat pulpal floor with 1.5mm pulpal depth at the central fossa area.
Stress analysis was done with two dimensional finite technique.
The obtained results were as follows:
1. The newly modified cavity designs were found to be more advantageous in stress distribution.
2. The effect of offset depth was not significant, but some relationship between the offset depth and stress distribution was found.