近中--远中洞型嵌体三维有限元模型及粘接界面的应力分析  

A three-dimensional finite element model of mesio-occluso-distal cavity zirconium dioxide inlay and its bonding interface:a stress analysis

作　　者：冯明 张国梅[2] 胡杨[3] 祝军[2] Feng Ming;Zhang Guomei;Hu Yang;Zhu Jun(Department of Dental Endodontics, Urumqi Stomatological Hospital, Urumqi 830002, Xinjiang Uygur Autonomous Region, China;Department of Stomatology, Shanghai Baoshan Luo Dian Hospital, Shanghai 201908, China;Department of Prosthodontics, the First Affiliated Hospital of Xinjiang Medical University, Urumqi 830054, Xinjiang Uygur Autonomous Region, China)

机构地区：[1]乌鲁木齐市口腔医院牙体牙髓科,新疆维吾尔自治区乌鲁木齐市830002 [2]上海市宝山区罗店医院口腔科,上海市201908 [3]新疆医科大学第一附属医院口腔修复科,新疆维吾尔自治区乌鲁木齐市830054

出　　处：《中国组织工程研究》2019年第14期2183-2189,共7页Chinese Journal of Tissue Engineering Research

基　　金：上海市宝山区科学技术委员会科技创新专项资金项目(16-E-24);三维有限元法分析CAD/CAM制备瓷嵌体的应力分布及修复机制;项目责任人:祝军~~

摘　　要：背景:在口腔修复领域,二氧化锆嵌体具有良好的机械、生物相容性和美学性能,但有关其临床洞型设计、牙体预备、粘接材料选择等尚无统一的标准。目的:探究3M RelyX Unicem或vario-link树脂粘接剂粘接后,二氧化锆嵌体模型粘接界面、牙体和牙周组织的应力分布规律及特点。方法:采用Micro-CT扫描人右下颌第三磨牙,通过Mimics、Goemagic Studio、NX 10.0等软件构建不同粘接剂(3M RelyX Unicem树脂黏结剂、vario-link树脂粘接剂)和洞型(牙合面洞深分别为2,3,4mm)的近中--远中二氧化锆嵌体三维有限元模型。利用ANSYS Workbench网格划分,分析各模型在10 N·mm转矩、45°加载175 N、90°加载600 N后的应力分布情况。结果与结论:①加载10 N·mm转矩后,洞深为3 mm模型的粘接剂等效应力、牙根面等效应力等最大,故在粘接界面、牙冠和牙根所受的应力最大;②舌向45°加载175N后,洞深4mm模型的粘接界面受力较大;在相同牙合面洞深下,3M RelyX Unicem树脂黏结剂模型的牙根和牙周组织应力值较大;③90°加载600 N后,洞深3 mm模型的牙根受力最大;在相同洞深下,3M RelyX Unicem树脂黏结剂模型的牙冠、牙根和牙周组织受力较大;vario-link树脂粘接剂模型的粘接界面受力较大;④各模型应力集中区域为牙根分叉区、嵌体边缘线、髓室顶、龈壁、近中根颊面近颈1/3处和远中根舌面近颈1/3等处;⑤结果说明,vario-link树脂粘接剂和3M RelyX Unicem树脂黏结剂均适宜做作为二氧化锆嵌体的粘接剂,但vario-link粘接强度较大且粘接界面应力较大,需综合考虑洞型设计、剩余牙体组织抗力形、固位形、牙周支持力等因素,采用优化洞型设计、牙体预备、垫底、高嵌体等设计方案,以期提高二氧化锆嵌体远期修复效果,但需进一步临床试验验证三维有限元模型实验结果。BACKGROUND: Zirconia inlays have good mechanical, biocompatible and aesthetic properties in the field of dental prosthodontics, but there is no consensus on the standards of zirconia inlays for clinical cavity design, dental preparation and selection of bonding materials. OBJECTIVE: To investigate the stress distribution and characteristics of the bonding interface, tooth and periodontal tissues of the zirconia inlay model after 3 M RelyX Unicem or vario-link resin adhesive bonding. METHODS: Micro-CT was used to scan the right mandibular third molars. A three-dimensional finite element model of MOD zirconia inlay with different adhesives(3 M RelyX Unicem resin binder, vario-link resin binder) and cavity types(2, 3, 4 mm in the depth of the joint cavity) was constructed by software Mimics, Goemagic Studio and NX 10.0. Using ANSYS Workbench mesh generation, the stress distribution of each model was analyzed after loading 10 N·mm torque, 45° 175 N, 90° 600 N. RESULTS AND CONCLUSION:(1) After loading 10 N·mm torque, the bonding agent equivalent stress and root surface equivalent stress of the model with 3 mm cavity depth were largest, so the stress on the bonding interface, crown and root was largest.(2) After loading 175 N at 45° lingual direction, the bonding interface of the model with 4 mm cavity depth undertook a higher stress. The stress values of the root and periodontal tissue of 3 M RelyX Unicem resin bonding agent model with the same cavity depth were higher.(3) After loading 600 N at 90°, the root force of the model with 3 mm cavity depth was largest. The crown, root and periodontal tissue of the 3 M RelyX Unicem resin bonding agent model with the same cavity depth undertook a higher stress. The bonding interface of the vario-link resin bonding agent model was under greater stress.(4) The regions of stress concentration areas included the bifurcation zone of the root, the inlay edge line, the roof of pulp chamber, the gingival wall, 1/3 mesial part of the buccal surface near the neck, and 1/3 mesial

关 键 词：嵌体 二氧化锆 粘接剂 二氧化锆嵌体 粘接界面 应力 牙体缺损 嵌入法 有限元分析 牙科粘固剂 组织工程 

分 类 号：R459.9[医药卫生—治疗学] R318.5[医药卫生—临床医学]