금인레의 와동의 폭경에 따른 응력분포와 변위에 관한 유한요소법적 연구
A Finite Element Analysis on Stress and Displacement According to Isthmus Width of Gold Inlay Cavity
신강석, 조영곤, 황호길,
소속 상세정보
신강석 ( Shin Gang-Suk ) - 조선대학교 치과대학 보존학교실
조영곤 ( Cho Young-Gon ) - 조선대학교 치과대학 치과보존학교실
황호길 ( Hwang Ho-Keel ) - 조선대학교 치과대학 치과보존학교실
KMID : 0353319930170010113
Abstract
The purpose of this study was to examine the clear concept of the designs for cavity preparations. Among the several parameters in cavity designs, profound understanding of isthmus width factor would facilitate selection of the appropriate
cavity
preparation of a specific clinical situation.
In this study, the cavities were prepared on maxillary first premolar and filled with gold inlay. A two-dimensional model was composed of 1037-node triangle elements. In this model, isthmus was varied in width at 1/4, 1/3 and 1/2 of intercuspal
width
and material properties were given for four element groups, i.e., enamel, dentin, pulp and gold.
The 500N occlusal load varied in direction and it was examined using three types of load: concentrated load, devided load and distributed load. The models were also examined with empty caities using the devided load and distributed load.
These models were analyzed the displacement and stress distribution by the two-dimensional Finite Element Method.
@ES The results were as follows:
@EN 1. All experimental models which filled with gold inlay after cavity preparation were similar direction of displacement with control model under same load type. But in the models with empty cavities, as isthmus width was wider, the degree of
displacement was increased at same load type.
2. Among the experimental models which were filled with gold inlay after cavity preparation, the model II showed the least stress concentration under concentrated load devided load. But in the models with empty cavities, the model Ⅲ showed the
largest
stress concentration and tooth fracture is expected regardless isthmus width.
3. All experimental models showed similar displacement pattern beneath restorative material under a concentrated load. In the models with empty cavities, a divided load resulted in a lingual displacement of the lingual cusp, but a distributed
load
resulted in a buccal displacement of the lingual cusp.
In regard to the above results, the restored models were stronger than empty models in respect to the bending moment and tensile stress. The empty models are expected to fracture regardless isthmus width.
The safest isthmus width was 1/3 of intercuspal distance, which showed the least stress concentration in respect to the effect of stress distribution.
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