Ⅱ类骨质中平台转换种植体植入深度对周围骨应力影响的有限元分析  

Influence of placing depth of implants with platform switching on stress distribution in peri-implant bone according to type Ⅱ bone by finite element analysis

作　　者：张强[1] 李英[2] 

机构地区：[1]山西医科大学口腔医学系 [2]山西医科大学第一医院口腔科,太原030001

出　　处：《国际口腔医学杂志》2014年第1期31-35,共5页International Journal of Stomatology

基　　金：山西省科技攻关项目(20130313015-6)

摘　　要：目的分析Ⅱ类骨条件下平台转换种植体植入深度对种植体周围牙槽骨应力分布特征的影响,为平台转换种植体的临床应用提供一定的参考依据。方法利用CT扫描以及Mimics 10.01、Solid Works 2007等软件实体建模技术,结合有限元软件ANSYS 14.0建立包含平台转换种植体及上部结构和中切牙牙冠的Ⅱ类骨质的有限元模型,并按照5种不同植入深度装配,分析垂直100 N及斜向100 N两种加载下种植体骨界面应力分布特征。结果不同加载下,种植体周围骨应力主要集中在种植体颈部平台与骨密质接触区,随植入深度加深从牙槽嵴顶向下转移,减轻了牙槽嵴顶的负荷。在植入牙槽嵴顶下1 mm时最大Von-mises应力有效降低。斜向载荷下种植体周围骨最大Vonmises应力显著高于垂直载荷下的应力大小。结论临床中平台转换种植体植入时应将颈部平台置于牙槽嵴顶下骨密质中。在Ⅱ类骨质中低于牙槽嵴顶1 mm有利于减轻种植体颈部边缘牙槽骨负荷。Objective This study aims to investigate the influence of placing depth of implants with platform switching on stress distribution in peri-implant bone according to type lI bone area to provide reference for clinical application. Methods CT scanning technology and software, such as Mimics 10.01, Solid Works 2007, and ANSYS 14.0, were used to establish five finite element models consisting of type II bone of the anterior maxillary, implant with platform switching, and super- structure and incisor crown based on five different insertion depths. The stress distribution characteristics of peri-implant bone under vertical 100 N and inclined 100 N loading were investigated. Results The peri-implant bone stress was mainly concentrated in the contact area of the implant neck platform and cortical bone and shifted down at a deeper placing level. The burden of alveolar crest was reduced. The maximum Von-mises stress was effectively reduced when the placing depth was 1 mm below the alveolar crest level. The maximum Von-mises stresses under inclined loading were higher than those under vertical loading. Conclusion The implant neck platform should be located in the cortical bone. Placement at 1 mm below the alveolar crest level in the type II bone area can improve the stress distribution of the marginal bone.

关 键 词：牙种植体 平台转换 种植深度 应力 有限元分析 

分 类 号：R783.6[医药卫生—口腔医学]