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材料和方法 用二维有限元模型模拟用6种修复材料包括金、铝、锆、玻璃陶瓷、合成物和纤维增强型合成物(FRC)制作的三单位粘接固定义齿(adhesive fixed partial denture,AFPD)和用FRC制成的3种三单位AFPD模型,牙体预备分别为双基牙近缺隙侧邻面设计,双基牙近缺隙侧近中(牙合)面远中(牙合)面设计和双基牙近缺隙侧近远中(牙合)面设计。模拟 50 N的(牙合)力垂直加在标准化桥体上,计算材料内部、牙—修复体界面和桥体平面的应力,并进行比较。
MATERIALS AND METHODS A two-dimensional finite element model was used to simulate three-unit adhesive fixed dentures made with six repair materials including gold, aluminum, zirconium, glass ceramics, composites and fiber reinforced composites (FRC) AFPD) and three kinds of three-unit AFPD models made of FRC. The dental preparations were designed as the proximal abutment of bidentate near flaps and near the occlusal surface of bidentate near the occlusal surface ) Face design and near abutment with double abutments near the gap (occlusal) face design. Simulations of 50 N occlusal forces were applied perpendicularly to a standardized bridge to calculate the internal stresses of the material, the tooth-restoration interface, and the bridge plane and compare them.