Abstract
For this purpose, the stress distribution produced on the porcelain and resin cement layer of prosthetic porcelain laminate veneer crown on upper central incisor, under the different loads were applied to the normal coverage portion and the incisal edge portion at an angle of 45° or 0° to the tooth axis, were estimated in the present study with respect to the shape of the abutment tooth for the laminate veneer crown, by means of finite element method as well as model tests.
The results obtained were as follows:
1. When the load force was applied to the incisal edge of abutment tooth covered over the incisal edge by porcelain, the tensile stress in the porcelain and the maximum shear stress at resin cement layer were most distinct.
Furthermore load distribution was parrarel to the tooth axis, the highest tensile stress was produced in the porcelain.
2. The maximum shear stress at resin cement layer were dependented on the sites of the prosities in resin cement layer rather than the amount of them.
3. As for a model test, there was no risk of fracture of the porcelain under the load within 15 kg.
