Stress distribution of mandibular second molars repaired with inlays and onlays made of 3 different mate-rials studied by 3D finite element analysis
10.3969/j.issn.1001-3733.2025.04.003
- VernacularTitle:3种不同材料和嵌体洞型修复下颌第二磨牙应力分布的三维有限元分析
- Author:
Dingyi YU
1
;
Hongling SI
;
Wenjing ZHAO
;
Ling LIU
Author Information
1. 710004,西安交通大学口腔医院,陕西省颅颌面精准医学研究重点实验室
- Publication Type:Journal Article
- Keywords:
Mandibular second molar;
Inlay;
Three-dimensional finite element;
Stress analysis
- From:
Journal of Practical Stomatology
2025;41(4):456-460
- CountryChina
- Language:Chinese
-
Abstract:
Objectives:To investigate whether the use of inlays and onlays made of 3 different materials respectively increases the risk of distal root fracture in mandibular second molars with alveolar bone resorption after root canal treatment.Methods:A 3D fi-nite element analysis(3D FEA)model of distal alveolar bone resorption in mandibular second molars was established using Micro-CT,Mimics21.0,geomagic and ANSYS17.0.3 types of materials(resin nanoceramic Lava ultimate,lithium disilicate ceramics e.max CAD and yttria-stabilized zirconia ceramic e.max Zir CAD)inlays and onlays were utilized for the application of vertical and 45° force loadin respectively.The von-Mises stress distribution on the models was analyzed.Results:Among the models,it was ob-served that cusp-covering onlay model demonstrated minimal Von Mises stresses at distal roots.Lava Ultimate exhibited the highes levels of Von Mises stress than other 2 materials,the stress was more concentrated towards upper parts of distal roots.Conclusion:When distal caries occur below the CEJ of mandibular second molars and are accompanied by alveolar bone resorption,the utilization of cusp-covering onlays and resin nanoceramics can reduce the risk of root fracture in the distal apical region.
