树脂陶瓷复合材料单冠美学区种植修复的三维有限元分析

目的:比较树脂陶瓷复合材料单冠美学区种植修复种植体、全冠、基台及周围骨组织应力分布情况,为临床应用提供理论依据.方法:应用Mimic 17.0软件建立上中切牙区牙槽骨、种植体、全冠,以及冠与基台不同黏固剂厚度间(0.05 mm和0.1 mm)的三维有限元模型.选用与种植体长轴呈130°,加载部位在舌隆突上方距切端2 mm的力,以及与种植体长轴平行加载在切端的力,大小为100 N,于不同工况下进行线性静态应力分析.结果:粘接剂厚度为0.05 mm树脂水门汀粘接时,Enamic、Ultimate树脂陶瓷复合材料冠与IPS Empress、blocs MarkⅡ陶瓷冠修复相比,牙槽骨、种植体、冠、基台应力较均匀,峰值略减小,但差距不明显.Enamic、Ultimate单冠修复时,粘接剂厚度为0.05 mm比0.1 mm时应力峰值明显减小,选择玻璃离子水门汀与树脂水门汀粘接,两者应力无明显差异.相同条件下,Ultimate、冠对种植体及周围组织应力峰值较小.结论:树脂复合陶瓷单冠用于美学区种植修复后,对种植体系统及周围组织应力较小、均匀,树脂在复合材料的比例及粘接剂厚度影响应力分布、峰值.

Three-dimensional finite element analysis of implant restoration in aesthetic zone of resin-ceramic composite single crown

PURPOSE: To observe and compare the stress distribution of implant, crown, abutment and surrounding bone tissues in the aesthetic zone after restoration of resin-ceramic composite single crown, and provide theoretical basis for clinical restoration. METHODS: Three-dimensional finite element models of alveolar bone, implant, crown, and the thickness of different adhesives between crown and abutment (0.05 mm and 0.1 mm) were established by using Mimics 17.0 software.Force was applied at the angle of 130° with the long axis of the implant, the loading position was 2 mm from the incisal cingulum, and other force on the incisal margin was loaded in parallel to the long axis of the implant. The size was 100 N. Linear static stress analysis was carried out to compare the Von Mises stress after single crown restoration with different materials. RESULTS: When the thickness of adhesive was 0.05 mm, and resin cement was selected, after restoration of Enamic, Ultimate resin ceramic composite crown, the peak stress of alveolar bone, implant, crown and abutment was more uniform and decreased slightly, but the difference was not significant compared with that of IPS Empress, blocs Mark Ⅱ ceramic crown. When the thickness of adhesive was 0.05 mm, the peak stress was significantly lower than that of 0.1 mm. There was no significant difference in the stress between glass ionomer cement and resin cement.Under the same conditions, restoration with Ultimate crown had smaller stress value of peak Von Mises. CONCLUSIONS: The stress of resin composite ceramics single crown when applied to implantation in aesthetic area is slightly less and more uniform. The proportion of resin in composites and the thickness of adhesive can affect the stress distribution and peak value.