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上颌无牙颌All-on-Four远中种植体不同倾斜角度和长度的三维有限元应力分析
引用本文:丁晓军,邱 憬,汤春波,周储伟,孙玉林,苏峰梅.上颌无牙颌All-on-Four远中种植体不同倾斜角度和长度的三维有限元应力分析[J].南京医科大学学报,2015(11):1628-1631.
作者姓名:丁晓军  邱 憬  汤春波  周储伟  孙玉林  苏峰梅
作者单位:南京医科大学口腔疾病研究江苏省重点实验室,南京医科大学附属口腔医院种植科,江苏 南京 210029; 江苏大学附属医院口腔科,江苏 镇江 212001,南京医科大学口腔疾病研究江苏省重点实验室,南京医科大学附属口腔医院种植科,江苏 南京 210029,南京医科大学口腔疾病研究江苏省重点实验室,南京医科大学附属口腔医院种植科,江苏 南京 210029,南京航空航天大学航空宇航学院,江苏 南京 210016,南京航空航天大学航空宇航学院,江苏 南京 210016,南京医科大学口腔疾病研究江苏省重点实验室,南京医科大学附属口腔医院种植科,江苏 南京 210029
基金项目:国家自然科学基金(81470778);江苏高校优势学科建设工程资助项目(2014-37)
摘    要: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?

关 键 词:无牙颌  All-on-Four  三维有限元  等效应力
收稿时间:2015/5/27 0:00:00

Three-dimensional finite element stress analysis of All-on-Four distal implants with different tilt angles and lengths on edentulous maxilla
Ding Xiaojun,Qiu Jing,Tang Chunbo,Zhou Chuwei,Sun Yuning and Su Fengmei.Three-dimensional finite element stress analysis of All-on-Four distal implants with different tilt angles and lengths on edentulous maxilla[J].Acta Universitatis Medicinalis Nanjing,2015(11):1628-1631.
Authors:Ding Xiaojun  Qiu Jing  Tang Chunbo  Zhou Chuwei  Sun Yuning and Su Fengmei
Institution:Jiangsu Key Laboratory of Oral Disease of NJMU,Department of Implantology,Affiliated Hospital of Stomatology of NJMU,Nanjing 210029,China; Department of Stomatology,Affiliated Hospital of Jiangsu University,Zhenjiang 212001,Jiangsu Key Laboratory of Oral Disease of NJMU,Department of Implantology,Affiliated Hospital of Stomatology of NJMU,Nanjing 210029,China,Jiangsu Key Laboratory of Oral Disease of NJMU,Department of Implantology,Affiliated Hospital of Stomatology of NJMU,Nanjing 210029,China,Astronautics College,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China,Astronautics College,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China and Jiangsu Key Laboratory of Oral Disease of NJMU,Department of Implantology,Affiliated Hospital of Stomatology of NJMU,Nanjing 210029,China
Abstract:Objective:To study stress distribution of All-on-Four distal implants with different tilt angles and lengths on edentulous maxilla using the three-dimensional finite element method. Methods:A female patient with edentulous maxilla was selected. After data collecting and three-dimensional reconstruction,a three-dimensional finite element model of edentulous maxilla with All-on-Four implant restoration was established. According to the tilt angles and lengths of the distal implants,there were four groups:Group A:30°,11.5 mm; Group B:30°,13 mm; Group C:45°,11.5 mm; Group:D 45°,13 mm. 100 N vertical static force was loaded on the first premolar,the second premolar and the first molar to simulate chewing, respectively Equivalent stress values of implants on the edentulous maxilla model were calculated using ABAQUS software. Results:Under the vertical static load,stress concentration was found around the implant neck in the cortical bone area. With the increase of the distal implant length,the stress decreased slowly in all regions. With the tilt angle of distal implant increasing,the distribution of stress became more dispersed and the stress in implant neck and apical areas significantly reduced. Conclusion:The stress distribution and magnitude of distal implant did not change significantly with the increase of the implant length,while the implant tilt angle of 45° was more favorable for stress dispersion than the implant tilt angle of 30°.
Keywords:edentulous  All-on-Four  three-dimensional finite element  equivalent stress
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