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KMID : 0376319910030010099
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Dental Journal of CNU
1991 Volume.3 No. 1 p.99 ~ p.115
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Stress analysis on the alveolar bone of cantilever bridges replacing maxillary lateral incisor
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Abstract
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The purpose of this study was to analysis the stress distribution induced by three unit PFM bridges and %ariow cantilever bridges replacing maxillary latersal incisor.
The simplified two-dimensional photoelastic models used for this study was constructed in the following way. MR ratio was designed to be 1 : 1, 1 : 125, and 1 : 1.5.
The pontics of cantilever bridge supported by maxillary canines consisted of wrap-around type, rest-extension M*, and simple type. 3-unit PFM bridge was constructed with traditional method.
1kg vertical static load was applied on the center of the incisal edge of the pontic.
The stress pattern was examined and recorded by photography.
The results obtained were as follows :
1. The magnitude of stress on the abutment root apex area of a traditional 3-unit bridge was the lowest
2. The model of cantilevered pontic with a rest showed the relatively well distributed stress around the abutmed tooth The model with simple pontic generated the greatest stress concentration in the supporting structure of tht abutment tooth.
3. As the height of bone level reduced, the rotational and vertical force increased around the abutment tooth
4. The stress concentration of the 3-unit bridges occured on the root apex and stress concentration of the cantilow bridge occured on the root apex and ..cervical area.
5. In the case of the cantilever bridge, stress concentrated distally on the root apex area of the abutment tooth and additional stress was oberved mesially on the upper part of the root Especially in the case of the simple pontic, this phenomenon was more apparent than the others.
6. Force applied to cantilevered pontic was transmitted to the adjacent central incisor through the contact surface. Stress was markedly observed on the mesial cervix area in the case of simple pontic and on the root apex and in ithe case of wrap-around type and rest-extension type.
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