“All-on-4”在不同骨质条件下应力分布的三维有限元分析

doi:10.13701/j.cnki.kqyxyj.2016.12.007

口腔医学研究 ›› 2016, Vol. 32 ›› Issue (12): 1252-1256.DOI: 10.13701/j.cnki.kqyxyj.2016.12.007

“All-on-4”在不同骨质条件下应力分布的三维有限元分析

葛奕辰¹,蒋少康¹,李轻如²,朱卓立^1*

1. 四川大学华西口腔医学院·华西口腔医院修复科四川成都 610041;
2. 四川大学电气信息学院医学信息工程系四川成都 610041

收稿日期:2016-06-14 出版日期:2016-12-25 发布日期:2016-12-26
通讯作者: 朱卓立,E-mail:zzl7507@126.com
作者简介:葛奕辰(1993~ ),男,甘肃人,学士在读,研究方向为口腔修复。
基金资助:
四川大学大学生创新创业计划项目(编号:201510610627)

Three-dimensional Finite Element Analysis of Stress Distribution under Different Bone Conditions in All-on-4 Therapy

GE Yi-Chen¹, JIANG Shao-Kang¹, LI Qing-Ru², ZHU Zhuo-Li^1*.

1. Department of Prosthodontics, West China School of Stomatology, Sichuan University, Chengdu 610041, China;
2. Medical Information Engineering, School of Electrical Engineering Information, Sichuan University, Chengdu 610041, China

Received:2016-06-14 Online:2016-12-25 Published:2016-12-26

摘要/Abstract

摘要： 目的:建立“All-on-4”种植三维有限元模型,研究不同骨质条件下远中种植体倾斜角度及修复体悬臂梁长度的变化对种植体及周围骨组织应力分布的影响,为临床提供依据。方法:CBCT扫描无牙颌下颌骨标本,将获取的DICOM数据图像,导入Mimics软件,进行三维重建,运用Geomagic studio软件进行实体化处理,利用Unigraphics及ANSYS Workbench软件模拟“All-on-4”种植建立三维有限元模型。设定修复体牙弓长度不变,在Ⅱ、Ⅲ类骨条件下,分别调整两个远中倾斜种植体倾斜角度及悬臂梁长度,在双侧悬臂梁末端施加150 N静载荷,对比分析种植体及周围骨组织应力分布规律。结果:当远中种植体倾斜角度为30°、45°及60°时,修复体悬臂梁长度分别为10.8 mm、8 mm及6.3 mm,Ⅱ类骨质条件下皮质骨应力峰值分别为26.8 MPa、23.5 MPa及16.3 MPa,Ⅲ类骨质条件下皮质骨应力峰值分别为40 MPa、29 MPa及21.8 MPa。结论:骨密度越低,种植体周围皮质骨应力越大;在牙弓长度相同的情况下,增大远中倾斜种植体的植入角度,可以减小修复体悬臂梁的长度,能有效地减小种植体及周围骨组织应力。

关键词: All-on-4, 骨密度, 应力分析, 三维有限元

Abstract: Objective: To study the influence of the varying inclination angles of distal implants and cantilever lengths of All-on-4 denture on stress distribution of implants and peri-implant bone tissues at different bone densities and to provide evidence for clinical applications. Methods: An edentulous mandible was scanned by CBCT. The DICOM digital images were obtained from CBCT and imported into Mimics for 3D-reconstruction. Geomagic studio was used to transfer the numerical model to entity. Unigraphics and ANSYS Workbench were deployed to found the three-dimensional finite element model simulating All-on-4 denture. When the lengths of prosthetic arcs were equal, models were modified in inclination of distal implants and cantilever lengths under Type Ⅱ and Type Ⅲ bone conditions. Static vertical forces of 150N were applied to the bilateral distal ends of each cantilever to analyze the stress distribution on implants and bone tissues nearby. Results: When angles of inclination were set 30°, 45°and 60°, the corresponding cantilever lengths were 10.8mm, 8mm and 6.3mm. The maximum stress values in Type Ⅱ bone condition were 26.8MPa, 23.5MPa and 16.3MPa and those in Type Ⅲ were 40MPa, 29MPa and 21.8MPa. Conclusion: The lower the bone density, the greater the stress values in peri-implant cortical bone. When the lengths of dental arcs were equal, an increase in angles of inclination with the successive decrease in cantilever lengths could effectively diminish the stresses in peri-implant bone tissues.

Key words: All-on-4 , Bone density, Stress analysis, Three-dimensional finite element

中图分类号:

R783.2

葛奕辰,蒋少康,李轻如,朱卓立. “All-on-4”在不同骨质条件下应力分布的三维有限元分析[J]. 口腔医学研究, 2016, 32(12): 1252-1256.

GE Yi-Chen, JIANG Shao-Kang, LI Qing-Ru, ZHU Zhuo-Li.. Three-dimensional Finite Element Analysis of Stress Distribution under Different Bone Conditions in All-on-4 Therapy[J]. Journal of Oral Science Research, 2016, 32(12): 1252-1256.

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“All-on-4”在不同骨质条件下应力分布的三维有限元分析

Three-dimensional Finite Element Analysis of Stress Distribution under Different Bone Conditions in All-on-4 Therapy

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