关键词: 全瓷嵌体, 下颌第一磨牙, 应力分布, 三维有限元

Abstract:

Objective　To study the influence of the inlay on the stress of the remained tooth tissue，three-dimensional finite element is used to analyse stress distributions of the tooth endured different MOD inlay restore at different remaining buccal wall thickness. Methods　Using ANSYS Workbench 15.0 software to established 3d finite element model of mandibular first molar restored by all-ceramic inlay restoration with designed MOD cavities. Analyzing the influences of different remaining buccal wall thickness to the stress distribution and tendency of the teeth. Results　Different remaining buccal wall thickness of the tooth tissue on the stress level had a certain influence；the lowest stress level was the remaining buccal wall thickness of 2 mm. The stress level of occlusal coverage restoration was higher than inlay restoration. Conclusion　The study found that different remaining buccal wall thickness of the tooth tissue on the stress level have a certain influence，try to keep healthy dentine，avoid enamel without foundation is effective means of inlay restoration reducing the risk of tooth fracture. Remaining more tooth tissue is not suggested to restore occlusal coverage.

Key words: all-ceramic inlay, mandibular first molar, stress distributions, three-dimensional finite element