Abstract
The aim of this work is to investigate the influence of contact area between the first molar implant and its adjacent teeth on finite element analysis. Five types of finite element contact models containing implant and its adjacent teeth were established: non-contact model (C0), contact models with different contact area (C1, C2, C3, C4). An occlusal force was applied to finite element models to calculate the stress of implant and bone interface on mandible. Compared with the group C0, the stress of alveolar bone surrounding the implant in other groups decreased 88.08 % at most, but the stress of cancellous bone surrounding the natural teeth increased 59.42 %. In summary, a proper small contact area can not only reduce the stress concentration on the implant region, but also can avoid an excessive stress in the periodontal ligament and alveolar bone around the natural teeth. The finite element results revealed that it is effectively to distribute the load implant suffered, especially to reduce the stress generated by the lateral load when the first molar implant has a small contact with its adjacent teeth.
Highlights
Because of the protection of periodontal ligament, the load applied on teeth can be effectively absorbed [1], the stress on alveolar bone is evenly distributed [2]
Stress concentration appeared on the lingual side of bone interface on the cancellous bone in C0 group
The contact between two teeth is simplified by a point contact, and the floss can enter the gap between two teeth under pressure [13]
Summary
Because of the protection of periodontal ligament, the load applied on teeth can be effectively absorbed [1], the stress on alveolar bone is evenly distributed [2]. The key to a long-term successful implanting is the reliability and stability of the bone interface combination. Without the protection of periodontal ligament, stress concentration on the bone interface can be found which generated by physiological load especially the lateral force. There is rarely paper about the contact area between implant and its adjacent teeth. In order to explore the effect of the contact area between implant and its adjacent teeth on the stress difference, five types of different contact areas with no contact as the control group were designed and simulated the situation of oral model to provide technical support for clinical application
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