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目的:应用三维有限元法研究上颌无牙颌All-on-Four远中种植体在不同角度和不同长度模型中的应力分布。方法 :选择1例上颌无牙颌女性患者,采集数据,三维重建,构建上颌无牙颌“All-on-Four”种植修复的三维有限元模型。按照远中种植体角度和长度不同分为4组:A组30°11.5 mm,B组30°13.0 mm,C组45°11.5 mm,D组45°13.0 mm。100 N垂直静载荷分别加载于第一、二前磨牙及第一磨牙上模拟咀嚼受力,应用ABAQUS软件测算种植体在上颌无牙颌模型上的等效应力值。结果:垂直载荷下,应力集中在种植体颈部周围骨皮质区;远中种植体长度增加,各区域应力缓慢下降;远中种植体倾斜角度增加,应力分布分散,种植体颈部和根尖区应力明显减小。结论:远中种植体长度增加对应力分布和大小的改变并不显著,远中种植体倾斜45°比倾斜30°更有利于应力分散。
OBJECTIVE: To study the stress distribution in maxillary and maxillary edentulous All-on-Four remote central implants with different angles and different lengths by using three-dimensional finite element method. Methods: One case of maxillary and edentulous female patients was selected. The data were collected and reconstructed by three-dimensional reconstruction. The three-dimensional finite element model of maxillary edentulous and All-on-Four implantation was established. According to the angle and length of distal implant, it was divided into 4 groups: 30 ° 11.5 mm in group A, 30 ° 13.0 mm in group B, 45 ° 11.5 mm in group C and 45 ° 13.0 mm in group D. 100 N vertical static loads were loaded on the first and second premolar teeth and the first molar simulated chewing force, the application of ABAQUS software measured in the maxillary maxillary maxillary edentulous model equivalent stress. Results: Under vertical load, the stress was concentrated in the cortical area around the neck of the implant. The length of the distal implant increased and the stress decreased slowly in all regions. The tilt angle of the distal implant increased, the stress distribution spread, the implant neck and apical Area stress decreased significantly. CONCLUSION: The increase of distal implant length has no significant effect on stress distribution and size change. The distal implant tilted 45 ° is more conducive to stress dispersion than tilted 30 °.