Numerical study about the strain analysis and the marginal design of dental indirect restorations

作者：Fratila Anca^*; Oleksik Valentin; Boitor Cornel; Pascu Adrian; Pirvu Bogdan

来源：Romanian Biotechnological Letters, 2012, 17(4): 7474-7482.

• finite element method
• finish line
• rounded shoulder
• therapeutic success

In accordance with modern tendencies, the present research aims to demonstrate important applications of numerical methods in the strain analysis in restorative dentistry.
Studies using finite element method were performed on geometric patterns obtained using a three-dimensional scanner. These studies analyzed human molars extracted and then prepared with different profiles at the cervical marginal limit. The geometric models were processed and then analyzed trough the method of finite element analysis ANSYS. For each geometric pattern a force of 400 N was applied in centric and eccentric mode and the following were calculated: Maximum Principal Stress, Equivalent von Mises Stress, Elastic Equivalent Strain, Total Deformation and Safety Factor.
At comparable conditions, the value of equivalent tension is bigger for the eccentric strain compared with the centric strain, regardless of the geometric finishing line. For the same strain conditions, the most favorable tension value was obtained preparing the teeth with rounded shoulder. The value of the safety factor was also bigger for the rounded shoulder due to the connection range that eliminates tension.
The analysis by finite element method allows obtaining necessary data in determining the optimal shape of tooth preparation. Knowing the form-strain correlation will provide necessary information to ensure and maintain therapeutic success.

• 出版日期2012-8