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Open AccessArticle

Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism

1
Division of Prosthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan
2
School of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
3
Division of Orthodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
4
Department of Biomedical Engineering, I-Shou University, Kaohsiung 82442, Taiwan
5
Department of Materials & Optoelectronic Science, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan
*
Author to whom correspondence should be addressed.
Materials 2019, 12(10), 1623; https://doi.org/10.3390/ma12101623
Received: 27 April 2019 / Revised: 14 May 2019 / Accepted: 15 May 2019 / Published: 17 May 2019
(This article belongs to the Special Issue Current and Future Trends in Dental Materials)
The aim of this study is to determine the minimum required thickness of a monolithic zirconia crown in the mandibular posterior area for patients with bruxism. Forty-nine full zirconia crowns, with seven different occlusal thicknesses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm, were made by using a computer-aided design/computer-aided manufacturing system (CAD/CAM). Seven crowns in each group were subjected to cyclic loading at 800 N and 5 Hz in a servohydraulic testing machine until fracture or completion of 100,000 cycles. Seven finite element models comprising seven different occlusal thicknesses of 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1.0 mm were simulated using three different loads of vertical 800 N, oblique 10 degrees 800 N, and vertical 800 N + x N torque (x = 10, 50, and 100). The results of cyclic loading tests showed that the fracture resistance of the crown was positively associated with thickness. Specimen breakage differed significantly according to the different thicknesses of the prostheses (p < 0.01). Lowest von Mises stress values were determined for prostheses with a minimal thickness of 1.0 mm in different loading directions and with different forces. Zirconia specimens of 1.0 mm thickness had the lowest stress values and high fracture resistance and under 800 N of loading. View Full-Text
Keywords: monolithic zirconia crown; thickness; dental implant prosthesis; cyclic loading; finite element analysis monolithic zirconia crown; thickness; dental implant prosthesis; cyclic loading; finite element analysis
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Lan, T.-H.; Pan, C.-Y.; Liu, P.-H.; Chou, M.M.C. Fracture Resistance of Monolithic Zirconia Crowns in Implant Prostheses in Patients with Bruxism. Materials 2019, 12, 1623.

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