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KMID : 0376319900020010225
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Dental Journal of CNU
1990 Volume.2 No. 1 p.225 ~ p.237
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TWO-DIMENSIONAL PHOTOELASTIC ANALYSIS ON VARIOUS TYPES OF COPING DESIGNS UNDER OVERDENTURE
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Yang Hye-Ryung
Vang Mong-Sook
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Abstract
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This study was executed to analyze the stress distribution of tooth, supporting structure and overdenture by two-dimensional photoelastics when 6 types of coping were inserted.
Types of coping were designed to be inclined plane, short dome, medium dome, short square, medium square and o-p anchor attachment.
Forces were applied respectively as follows :
1) Vertical load of 12kg on the incisal edge
2) 30˚diagonal load of 8kg on the labial surface.
The results were as follows ;
1. In case of short dome and o-p anchor attachment, the stress is evenly distributed on teeth, supporting tissue structure under vertical and 30˚diagonal load, then short dome and o-p anchor attachment show better stress distribution and stabilization of overdenture than any other copings.
2. Inclined plane revealed greater tendency of displacement of overdenture than any other coping under labial diagonal load.
3. Long height of copings had greater concentration of stress than short height of copings.
4. In case of medium dome under labial diagonal load, there were high level of stress concentration on denture base contacted labioincisal angle of coping.
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