인레이, 온레이, 3/4금관 및 전부주조관 수복 후 하중을 가할 시 치아내부에 발생하는 응력의 광탄성학적 비교분석 = A Photoelastic Comparative Analysis of Stress Distribution in Inlay, Onlay, 3/4Crown and Full Veneer Crown

다국어 초록 (Multilingual Abstract)

The purpose of this study was to evaluate the stress patterns and magnitudes in the internal part of a tooth according to the types of restoration when treated with a M. O. D. cavity preparation. In cases of the lower left 2nd premolar, four two-dimensional photoelastic models with M.O.D. onlay, 3/4crown and full veneer crown were prepared and the restorations were cemented.
A vertical load of 30lbs was applied to each model on a two-point contact near the central fossa and a one-point contact on the buccal incline of the buccal cusp.
Two dimmensional photoelastic stress analysis was used, and the stress areas were recorded photoelastically.
The results were as follows:
1. In the case of the inlay model, the internal stress distributions were the highest especially on the linguopupal line angle.
Thus the possibility of fracture on the lingual cusp is the highest among the four models.
2. Comparing the onlay and 3/4 crown, both showed similar stress patterns. However, maximum compressive stress on the linguopulpal line angle and lingual pulpal horn went in the same direction on onlay: therefore, the 3/4 crown was considered better.
3. One the full veneer crown stress distribution showed evenly.
It showed the best stress distribution.