Stress distribution of endodontically treated maxillary premolars restored with different cusp coverage design
10.3760/cma.j.issn.1002-0098.2013.s1.003
- VernacularTitle:根管治疗后上颌前磨牙直接粘接修复的应力分布
- Author:
Jun-Xin LI
1
;
Jie NIE
;
Xiao-Yan WANG
;
Xue-Jun GAO
Author Information
1. 100081,北京大学口腔医学院·口腔医院牙体牙髓科
- Keywords:
Root canal therapy;
Finite element analysis;
Dental stress analysis;
Direct adhesive restoration
- From:
Chinese Journal of Stomatology
2013;48(z1):10-14
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the stress distribution of different cusp coverage composite restorations in endodontically treated teeth using a three-dimensional finite element analysis(FEA).Methods An intact maxillary second premolar of young male extracted for orthodontic treatment was digitized with a micro-CT scanner to establish a three-dimensional finite element model.The model was further modified to simulate different cavity preparations.Six individual finite element models were built up:G1,intact premolar; G2,endodontically treated premolar with distal occlusal (DO) defect; G3-G6,endodontically treated premolars with DO defect restored with different cusp coverage composite restorations (G3:directly restoration ; G4:partial coverage of palatal cusp; G5:full coverage of occlusal surface; G6:partial coverage of occlusal surface).The load of 200 N was applied to two cusp incline surfaces.The stress distribution and safety factor of each group was investigated.Results For G1 to G6,the tensile stress of the whole tooth were 106,383,287,56,62 and 95 MPa,respectively.For G3 to G6,the safety factors of the restoration were 5.46,1.38,1.43,1.73,while the safety factors of the adhesive layer were 0.33,0.52,5.16,2.11,respectively.Conclusions The full and partial coverage of occlusal surface was superior to that of palatal cusp coverage.
