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The inlay is made of different materials, embedded inside the tooth, restore the defect morphology and function of the tooth prosthesis or crown retainers. Inlay restoration for caries larger teeth, you can put it back exactly the shape, good or even an accurate adjacency. In dental inlays large area defect main purpose is to retain teeth, restore chewing function. The inlay restoration wedge effect of the presence of bear bite force, causes the tensile stress increase, the damaging effects of the remaining tooth structure, or even fracture, resulting in a failed repair. To understand the inlay restoration stress changes influence of the remaining tooth structure, the subject of three-dimensional finite element stress analysis, mandibular first molar - the occlusal surface - far in the hole type (MFM-MOD) material inlay restoration, analysis of tooth structure under different load conditions, the stress distribution, in order to provide experimental basis for clinical inlay repair. The purpose of the experiment and method: 1, the establishment of FM-MOD computer three-dimensional solid and finite element model. Spiral CT scan of Mimics, Geomagic Studio 7 and other image processing software of the mandibular first permanent molars the moire point model by UG software mandibular first permanent three-dimensional geometric model by finite element software ABAQUS meshing and finite element software in MSC.MARC were established to save the pulp and root canal treatment inlay restoration the MOD hole type, root canal treatment Onlay repair MOD hole-mandibular first molar dimensional finite element model, in order to follow-up experiments. Analysis of three materials of resin, ceramic, gold alloy inlays to repair the MOD hole type, three-dimensional finite element analysis of the force of the tooth structure under different loading conditions. Three materials on the model, the implementation of centralized load, vertical load and tongue were taken to 45 ° loaded by the overall stress cloud, stress curve analysis was performed using different materials restoration of the remaining tooth structure stress, understanding stress trends. (3) study MOD hole-type save the pulp and root canal treatment inlay restoration, as well as root canal treatment was made after Onlay repair, the stress distribution of tooth structure under different load conditions. Implementation of the model different materials prosthesis central concentrated load, take the vertical load and tongue to 45 ° loaded by the overall stress cloud, stress curve analysis of the inlay restoration the MOD hole type preservation pulp stress change Inlay and Onlay repair stress trends trends, and MOD-hole type in root canal therapy. Results: 1. Enamel, dentin, pulp, alveolar bone and other tissue, including three-dimensional finite element model, the model has a good geometric similarity. Repair materials have a certain impact on the stress level of the tooth structure. Gold alloy inlay restoration of maximum stress, ceramic inlays, followed by composite resin inlay restoration minimum stress. Inlay save the pulp repair MOD-hole type, root canal treatment Inlay and Onlay repair the the MOD hole type three cases Onlay repair the stress generated by the remaining tooth structure minimum, the vital teeth case followed by stress, RCT Inlay repair the MOD hole type of stress. Conclusion: (1) The experimental combination of CT scanning technology, digital image processing technology and finite element method, the establishment of a high-precision FM-MOD three-dimensional finite element model, which laid the foundation for further research. 2 in the resin, ceramic, gold alloy three materials the composite inlay Repair MOD hole type can reduce the stress of the remaining tooth structure. Under the experimental conditions Onlay Repair MOD hole type is the best repair. Minimum harm to the remaining tooth structure. The MOD-hole type on the risk of root canal treatment should be used with caution Inlay restored to minimize the occurrence of clinical odontoclasis.
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