title: 3-D stress analysis in first maxillary premolar.
abstract: The aim of this study was to investigate the stress distribution in a 3-D model of two-rooted tooth (first maxillary premolar) under two different occlusal force vectors by using finite element analysis. In the first model overall force of 200 N was divided into three vectors (cusp to fossa occlusion), and in the second model overall force was divided into 4 vectors (cusp to fossa and cusp to marginal ridge occlusion). The greatest compressive stress was found at the dentino- enamel junction in the cervical area of the both models (about -200 MPa). The greatest tensile stress was found at the vestibular aspect of buccal cusp in second model (about +3 MPa) and in the central fossa of the both models (about +28 MPa). Results indicate that in the both types of occlusal loadings the stress distribution was mainly compression and compressive forces were predominant over tensile stresses. In the second model with 4 vectors, stresses generated in the tooth structure were higher compared to the stresses generated in the first model with 3 vectors.
authors.affiliation: Department of Oral and Maxillofacial Surgery, School of Dental Medicine, University of Rijeka, Rijeka, Croatia. jborcic@medri.hr
authors.forename: Josipa
authors.initials: J
authors.lastname: Borcić
authors.forename: Robert
authors.initials: R
authors.lastname: Antonić
authors.forename: Miranda Muhvić
authors.initials: MM
authors.lastname: Urek
authors.forename: Nikola
authors.initials: N
authors.lastname: Petricević
authors.forename: Petra
authors.initials: P
authors.lastname: Nola-Fuchs
authors.forename: Amir
authors.initials: A
authors.lastname: Catić
authors.forename: Ivica
authors.initials: I
authors.lastname: Smojver
mesh_terms: D001641:Bicuspid / Q000502:physiology*; D003799:Dental Stress Analysis / Q000379:methods*; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D008437:Maxilla / Q000502:physiology*