The stress distribution within dentin upon the use of different restoration materials

Mohammed Bakhit, BDS, Daizo Okada, DDS, PhD, Siyang Luo, DDS, PhD, Chiharu Shin, DDS, PhD, Reiko Ogura, DDS, PhD, Wataru Komada, DDS, PhD, and Hiroyuki Miura, DDS, PhD

Fixed Prosthodontics, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan

Purpose: High flexibility makes polyetheretherketone (PEEK) attractive for use as a restoration material. The aim of this study was to evaluate the stress distribution within a root for five types of restoration materials.
Materials and Methods: A three-dimensional root canal-treated premolar finite element model was fabricated, and the model was reconstructed with five restoration materials. A 100-N occlusal force was loaded 45˚ to the long axis, and the stress was calculated.
Results: The magnitudes of the stress surrounding the cervical area for the palladium-silver-gold alloy, hybrid resin composite, zirconia, all ceramic, and PEEK materials were 22.7, 21.0, 22.2, 22.2, and 18.4 MPa, respectively. The magnitudes of the stress surrounding the base of the posts were 6.5, 8.8, 5.9, 6.4, and 14.6 MPa, respectively.
Conclusion: The restoration fabricated using PEEK prevented stress from occurring at the marginal area of the dentin; however, PEEK increased the stress at the base of the post to a greater degree than the other restoration materials.
(Asian Pac J Dent 2017; 17: 41-47.)
Key Words: stress distribution, von Mises stress, Young’s modulus