title: [Numerical analysis of the anti-fracture intensity of packed and repaired tooth in different cavity capacities].
abstract: This study was aimed to assess the stress distribution of different capacity of class I cavity after composite resin filling. A three-dimensional finite element made of the maxillary second molar was constructed by spiral CT scan technology. Based on this model, stress distribution in tooth was analyzed before and after post-core restorations with 5 different capacities of class I cavity. When the circle triangle of class I cavities being under 50N vertical pressures, the cavity capacity increased from 3.3 mm to 3.7 mm, the maximum tensile stress values of the composite resin restorations being 3 times those of normal tooth, which were 14.872 MPa, 16.682 MPa and 17.589 MPa, 17.307 MPa and17.912 MPa. Obviously, the effect of different capacities of class I cavity on the maximum stress value enduring ability of teeth was samll, but in the analysis model, the enduring ability of teeth was reduced when the molars were filled with resin.
authors.affiliation: Department of Stomatology, Union Hospital, Huazhong Science and Technolog University, Wuhan 430022, China. pweihong@sina.com
authors.forename: Weihong
authors.initials: W
authors.lastname: Pan
authors.forename: Chunjie
authors.initials: C
authors.lastname: Lü
authors.forename: Zhiliang
authors.initials: Z
authors.lastname: Tian
mesh_terms: D003188:Composite Resins / Q000737:chemistry*; D003198:Computer Simulation; D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D008954:Models, Biological; D008963:Molar / Q000000981:diagnostic imaging / Q000473:pathology*; D011176:Post and Core Technique; D012387:Root Canal Filling Materials / Q000737:chemistry; D036542:Tomography, Spiral Computed
chemical_list: D003188:Composite Resins; D012387:Root Canal Filling Materials