Three-dimensional morphology was used to analyze the influence of posterior teeth loss on temporomandibular joint

Objective: To explore the influence of posterior teeth loss on temporomandibular joint by three-dimensional morphological analysis. Methods: 3D data were obtained by holographic scanning and measuring the models of teeth and chin, and the 3D models were constructed by computer. Results: Under normal conditions, the maximum compressive stress of temporomandibular joint is located in the anterior medial side of condylar cartilage, the stress of condylar head is higher than that of medial and lateral sides, and the compressive stress of articular disc is the highest in medial and lateral sides. The compressive stress of the anterior condyle slope is significantly higher than that of the corresponding part of the articular disc (P<0.01). Conclusion: The change of temporomandibular joint pressure caused by tooth loss will be greatly improved after denture restoration. Therefore, in the case of missing posterior teeth, especially when a large number of molars and loose ends are missing, in order to prevent periodontal disease and temporomandibular joint disease, it is strongly required to repair them as soon as possible.