Ⅲ类骨质中种植体长度及植入深度对周围骨应力的影响  

Impact of implant length and implantation depth on stress on typeⅢbone surrounding implant

作　　者：毕佳慧 姚明 栗燕菲 李咪娜 程涛[1] BI Jiahui;YAO Ming;LI Yanfei;LI Mina;CHENG Tao(Department of Dental Implant Prosthesis,the First Affiliated Hospital,Zhengzhou University,Zhengzhou 450052)

机构地区：[1]郑州大学第一附属医院口腔种植修复科,郑州450052

出　　处：《郑州大学学报（医学版）》2024年第2期221-227,共7页Journal of Zhengzhou University(Medical Sciences)

基　　金：河南省医学科技攻关计划省部共建重点项目(SBGJ202002107)。

摘　　要：目的:应用三维有限元分析法分析Ⅲ类骨质中种植体长度及植入深度对周围骨组织生物力学的影响。方法:利用建模软件Mimics等建立直径为5 mm、长度分别为8和10 mm的平台转移型种植体,并将种植体颈部平台置于平牙槽嵴顶、牙槽嵴顶下1 mm和牙槽嵴顶下2 mm的颌骨中,共包含6组三维模型。分别对每个模型给予垂直225 N及斜向200 N的载荷,研究种植体周围骨组织Von Mises应力/应变峰值及分布特征。结果:应力云图显示应力/应变主要集中在种植体颈部平台周围的骨质中,当种植体颈部平台位于牙槽嵴顶下1 mm时,皮质骨顶端区域应力/应变分布范围最小。在同一种植体长度下,随着种植体颈部平台下移,皮质骨应力/应变峰值先增大后减小,松质骨的应力/应变峰值逐渐增大,牙槽嵴顶端应力均逐渐减小。当种植体颈部平台位于牙槽嵴顶下2 mm时,松质骨所受应力/应变峰值超过松质骨生理强度安全范围上限。种植体长度增加,种植体周围骨组织应力/应变减小。种植体颈部平台植入深度比种植体长度对周围骨应力的影响更大。同等条件下,斜向加载Von Mises应力/应变峰值均大于垂直加载。结论:两种长度种植体的力学结果相似,植入深度对种植体-骨界面的影响大于种植体长度。颌骨可用高度一定时,长度8 mm、植入深度1 mm的种植体更有利于种植体周围骨组织及软组织保存。Aim:To analyze the impact of implant length and implantation depth on the biomechanics of typeⅢbone surrounding implants using three-dimensional finite elements.Methods:Using modeling software such as Mimics,a platform transfer implant with diameter of 5 mm and length of 8 and 10 mm,respectively,were created for this experiment.The depth of the implant′s neck platform was set as 0,1 mm,2 mm lower than the crest of the alveolar ridge,and there were 6 groups of three-dimensional models.Applying 225 N vertical and 200 N oblique loads to each model allowed researchers to examine the Von Mises stress/strain peak of the bone tissue around implants and distribution features.Results:The stress nephogram revealed that the stress/strain primarily focused in the bone surrounding the implant′s neck platform.The implant′s neck platform had the least stress/strain distribution in the cortical bone′s apex region when it was positioned 1 mm below the crest of the alveolar ridge.As the implant′s neck platform was moved lower under the same implant length,the stress/strain peak of the cortical bone first increased and then reduced,the stress/strain peak of the cancellous bone progressively increased,and the stress on the apex of the alveolar ridge gradually decreased.The stress/strain peak of the cancellous bone exceeded the upper limit of the safe range of physiological strength when the neck platform of the implant was placed 2 mm below the crest of the alveolar ridge.The stress/strain on the bone tissue surrounding the implant diminished as implant length increased.The depth of neck platform implantation had bigger impact on the surrounding bone stress than the length of the implant.Under the same conditions,the Von Mises stress/strain peak under oblique loading was larger than that under vertical loading.Conclusion:The mechanical results of implants with two implant lengths are similar,and the effect of implantation depth on the implant bone interface is greater than that of implant length.When the available height

关 键 词：种植体长度 植入深度 应力 有限元 

分 类 号：R782.12[医药卫生—口腔医学]