摘要
目的探讨不同长度及螺纹顶角的微种植体在下颌颊棚区应用的应力分布。方法建立长度分别为8 mm、9 mm、10 mm、11 mm、12 mm以及螺纹顶角分别为30。、45。、60。、75。、90。、105。、120。的35种微种植体三维有限元模型,模拟植入下颌颊棚区,加载120gf近中矢状向正畸牵引力,分析长度和螺纹顶角对周围骨界面应力分布的影响。结果应力主要集中在微种植体皮质骨界面和微种植体尖端松质骨区域,应力最大值来自微种植体皮质骨界面,松质骨界面应力较小。随着微种植体长度的增加,皮质骨界面的应力峰值逐渐减小,松质骨界面应力峰值逐渐增加。皮质骨应力峰值变化范围为0.104~0.241 MPa,松质骨应力峰值的变化范围为0.028~0.034 MPa,较皮质骨应力峰值小1个数量级;随着螺纹顶角的变化,各种长度的微种植体骨界面应力峰值变化均无明显规律。结论在下颌颊棚区,当长度为8~12mm范围内,解剖条件允许时,建议使用更长的微种植体,螺纹顶角对微种植体周围骨界面的应力分布无明显影响。
Objective To investigate how variations in microimplant length and thread angle affect stress distribution in the mandibular buccal shelf.Methods Finite element models of 35 microimplants were established,with lengths of 8,9,10,11,and 12 mm,and thread angles of 30°,45°,60°,75°,90°,105°,and 120°.The implants were simulated within the mandibular buccal shelf under a 120 gf mesiodistal orthodontic traction force.Stress distribution at the bone-implant interface was analyzed to evaluate the effects of implant length and thread angle.Results Stress was mainly concentrated at the cortical bone interface and at the tip of the microimplant within the cancellous bone.The maximum stress occurred at the cortical bone interface,while stress within the cancellous bone interface was relatively lower.As implant length increased,the peak stress within cortical bone decreased gradually,whereas that within cancellous bone increased slightly.The cortical bone stress ranged from 0.104 to 0.241 MPa,and the cancellous bone stress ranged from 0.028 to 0.034 Mpa,which was one order of magnitude lower than the cortical bone peak stress.Changes in thread angle did not show a consistent pattern in stress distribution.Conclusion In the mandibular buccal region,within the range of 8-12 mm,longer microimplants are recommended when anatomical conditions.Thread angle exerts minimal influence on peri-implant stress distribution in the mandibular buccal shelf.
作者
樊星
袁丽仙
刘珂
王智伟
高锦瑜
刘鑫
Fan Xing;Yuan Lixian;Liu Ke;Wang Zhiwei;Gao Jingyu;Liu Xin(Department of Orthodontics,Yan'an University Affiliated hospital.Yan'an 716000;State Key Laboratory of Oral&Maxillofacial Reconstruction and Regeneration,National Clinical Research Center for Oral Diseases,Shaanxi Clinical Research Center for Oral Diseases,School of Stomatology,The Fourth Military Medical University,Xi'an 710032)
出处
《口腔材料器械杂志》
2025年第4期204-210,共7页
Chinese Journal of Dental Materials and Devices
基金
国家口腔疾病临床医学研究中心重点项目(LCA202203)。
关键词
微种植体
三维有限元
下颌颊棚区
长度
螺纹顶角
Microimplant
Finite element analysis
Mandibular buccal shelf
Implant length
Thread angle
