Experimental and Numerical Study the Effect of Materials Changing on Behavior of Dental Bur (Straight Fissure) under Static Stress Analysis

Abstract

In this research, the objectives are achieved experimentally and numerically. The experimental works consisting tensile, flexural and torsion tests at room temperature (25^oC) for two materials;  tungsten carbide and a novel that was eggshell powder mixing with polyester, to find a mechanical properties (Young's modulus and Poisson's ratio from tensile test, maximum bending stress from flexural test, maximum shear stress and modulus of rigidity from torsion test) of these materials.

A numerical static analysis of dental bur (straight Fissure) had been presented where a finite element model of straight fissure was built by programing method in ANSYS.14 software then it was exported as IGES file to ANSYS workbench.14 where in which the other steps of this analysis was completed.

Three sizes of straight Fissure bur were studied for two materials types where a comparison between tungsten carbide and a novel material that was eggshell powder was establish  to investigate any material can withstand the same stress with lower stress values.

Main results show that the stresses value for a new material are less than the original manufacturing one and also the stress distribution of bur made from eggshell powder mixing with polyester was smoother than the tungsten carbide bur.

The experimental and numerical of maximum Von Mises stress percentage error as shown in Table 3 are 13.33% and 7.06% for tungsten carbide and Eggshell mixing with polyester for size 1, respectively.

Key wards: straight fissure, dental bur, finite element, novel material, tungsten carbide, eggshell powder, stress distribution.