Crack Propagation and Fatigue Performance of Partial Posterior Indirect Restorations: An Extended Finite Element Method Study

Author:

Demirel Mehmet Gökberkkaan1ORCID,Mohammadi Reza2ORCID,Keçeci Murat3

Affiliation:

1. Department of Prosthodontics, Faculty of Dentistry, Necmettin Erbakan University, Konya 42090, Turkey

2. Faculty of Dentistry, Necmettin Erbakan University, Konya 42090, Turkey

3. Department of Prosthodontics, Faculty of Dentistry, Karamanoğlu Mehmet Bey University, Karaman 70000, Turkey

Abstract

Dental ceramics are susceptible to slow, progressive crack growth after cyclic loading. The purpose of this study was to investigate the progressive patterns of cracks in two different types of CAD/CAM ceramic materials used with three different partial posterior indirect restoration (PPIR) designs and to determine the materials’ failure risk using a fatigue test. Standard initial cracks were formed in Standard Tessellation Language (STL) files prepared for three different PPIRs. The materials chosen were monolithic lithium disilicate (LS) and polymer-infiltrated ceramic networks (PICNs). The extended finite element method (XFEM) was applied, and the fatigue performance was examined by applying a 600 N axial load. The cracks propagated the most in onlay restorations, where the highest displacement was observed. In contrast, the most successful results were observed in overlay restorations. Overlay restorations also showed better fatigue performance. LS materials exhibited more successful results than PICN materials. LS materials, which can be used in PPIRs, yield better results compared to PICN materials. While inlay restorations demonstrated relatively successful results, overlay and onlay restorations can be specified as the most and the least successful PPIR types, respectively.

Publisher

MDPI AG

Subject

Biomedical Engineering,Biomaterials

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