CAD MODELING AND STRESS ANALYSIS OF HUMAN TOOTH USING FINITE ELEMENT METHOD

Abstract

In the present modern era, every human is concerned about dental health and look. It represents ones personality in the
social field. Various functional loads create stresses inside the tooth which governs failure of tooth. To study the stress of critical
part of human body, the field of dentistry popularly applies important branch of engineering “Biomechanics”. Traditional
dentistry have many restrictions for image analysis these methods are confined to only 2D , on the other front traditional stress
analysis confined to only methods of strain gauge, Photo elasticity and 2D Finite Element analysis. These traditional methods
resulted in inability of finding solution for complex behavior of human tooth. These methods are unable to carry stress analysis of
human’s real tooth in 3D as well these methods are time consuming and not accurate. Present work finds scope to reproduce
CAD model and carry stress analysis of human’s real tooth. The scope covers critical factors of tooth like irregular geometry,
complex material properties and complicated loading conditions in 3D to bring accurate results in short time. There is a scope to
perform analytical stress calculation of complex geometry of tooth. Present work overcomes past restrictions by image processing
and reproducing actual 3D tooth model of human’s real Molar tooth by the use of CT scan and suitable biomedical imaging
software 3D Doctor. The reproduced 3D model is used for FE analysis with the use of FEA software ANSYS. As the Analytical
approaches are not available for complex dental structures the stress analysis is done by analytical method too. Present study
revealed that, the use of CT scan and 3D doctor software enabled to generate accurate 3D CAD model of actual humans tooth.
This obtained exact solution, better visualization for actual tooth subjected to loads of mastication. Stress analysis results
quantified the stress value and confirmed that stress due to bending load is higher compared to axial load. Use of FEA tool for
such complex geometry and complex loading conditions overcomes the limitations of experimental and analytical approaches
used for stress analysis. The methodology adopted in this study adds value to investigate optimal designs for dental implant in
shortest time. This also helpful for treatments & complicated surgeries for Bio medical, Dentistry field & Skeletal Anchorage
System (SAS) of human body in shortest time.