Stress distribution in crown and root dentin associated with different crown materials and thicknesses

Chiharu Shin, DDS, PhD, Daizo Okada, DDS, PhD, Reiko Ogura, DDS, PhD, Ling Huang, BDS, Kunihiko Mizusawa, DDS, Keiichi Yoshida, DDS, PhD, and Hiroyuki Miura, DDS, PhD

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

Purpose: To evaluate stress distribution around the marginal area of three full veneer crown restorations with different thicknesses.

Materials and Methods: Two types of premolar finite element model (normal and half thickness of crown; NC, HC) were made on the personal computer and three types of crown material (polyetheretherketone, PEEK, PK; hybrid composite resin, HR; and Ag-Pd-Cu-Au alloy, PD) were assumed. Then the magnitude of stress at the marginal area of crown was calculated.

Results: The magnitude of stress for PD-NC, HR-NC, PK-NC, PD-HC, HR-HC, PK-HC was 26.4, 21.3, 14.2, 50.6, 26.1, and 13.3 MPa respectively. The crown fabricated by PEEK prevented the stress concentration at the marginal area.

Conclusion: Crowns fabricated by PEEK prevent the concentration of stress at the crown margin, and there is a possibility that these crowns require less tooth preparation in this area, when compared to metallic crowns.
(Asian Pac J Dent 2019; 19: 71-76.)
Key Words: finite element analysis, polyetheretherketone (PEEK), stress