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Effect of Different Tilting Angels of Third Molar on the Stress Distribution of the Rigid Fixed Bridge in Deletion of First Molar and Second Molar in Mandibular

Author: WuZuo
Tutor: ZhangYi
School: Fujian Medical
Course: Clinical Stomatology
Keywords: Fixed bridge Finite Element Analysis Dimensional finite element model Tilt abutment Stress Analysis Third molars
CLC: R783.6
Type: Master's thesis
Year: 2011
Downloads: 33
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Abstract

Objective: To establish the mandibular first molar and second molars three fixed bridge abutments dimensional finite element model of the different tilt angles near the third molar teeth as a base when the force after the restoration, the tooth structure and dental Week membrane stress analysis and comparison. Methods: (1) Choose a healthy volunteer, the lower edge of its orbit to the lower edge of the chin spiral CT scans obtained tomographic image reconstruction with Mimics software to obtain mandibular first molar and second molar teeth missing three base pairs end of the three-dimensional solid model of a fixed bridge. (2) the three-dimensional solid model into Ansys software, create periodontal ligament, bony plates, prostheses, cancellous bone and cortical bone and other tissues, a three-dimensional finite element model. (3) assigned to different parts of the different elastic modulus and Poisson's ratio of the mesh model, set boundary conditions, the restoration of the buccal tooth tip of the tongue inclined along the vertical axis and 45 ° tilt of the load 300N force analysis in the third molar mesial inclination 0 °, 10 °, 20 °, 30 ° and 40 ° cases prosthesis tooth and periodontal ligament stress changes. Results: (1) to establish a three-dimensional finite element model including teeth, restorations, periodontal ligament and alveolar bone, a total of 4,260,835 units and 739,986 nodes. (2) vertical load, the stress concentration at the connection prosthesis surface, dental and periodontal ligament stress concentration at the neck of the tooth, third molar mesial root tip also stress concentration. With the third molars in the tilt angle increases, the equivalent stress extreme increases. Third molars tilted 30 °, the third molar tooth neck mesial periodontal film stress extreme surge of approximately 2.4 times at 0 °. (3) tilt load, stress prosthesis remains focused on connecting body surface, the stress concentration at tooth root Central premolars and third molars buccal tooth neck and near the apex. Stress concentration at the periodontal tissue buccal premolar tooth neck and the third molar distal buccal root Central. Third molars tilted 30 °, the third molars buccal root periodontal film stress extremes increased dramatically. (4) an equivalent load, tilt loads periodontal ligament and dental tissue equivalent stress greater than the vertical load under extreme stress such as extreme. Conclusions: (1) use of CT scans, combined with Mimics software and Ansys software, you can create a higher mechanical and geometric similarity of three-dimensional finite model. (2) whether the vertical load or inclined load, the stress concentrated on the restoration surface of the connector body. (3) When the teeth tilt angle is greater than 30 °, suitable as a fixed bridge abutment. (4) fixed bridge, should be appropriately reduced cusp inclination to reduce lateral force abutments.

Effect of Different Tilting Angels of Third Molar on the Stress Distribution of the Rigid Fixed Bridge in Deletion of First Molar and Second Molar in Mandibular

Abstract

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