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

被引:9
|
作者
Lan, Ting-Hsun [1 ,2 ]
Pan, Chin-Yun [3 ]
Liu, Pao-Hsin [4 ]
Chou, Mitch M. C. [5 ]
机构
[1] Kaohsiung Med Univ Hosp, Dept Dent, Div Prosthodont, Kaohsiung 80708, Taiwan
[2] Kaohsiung Med Univ, Coll Dent Med, Sch Dent, Kaohsiung 80708, Taiwan
[3] Kaohsiung Med Univ, Kaohsiung Med Univ Hosp, Dept Dent, Div Orthodont, Kaohsiung 80708, Taiwan
[4] I Shou Univ, Dept Biomed Engn, Kaohsiung 82442, Taiwan
[5] Natl Sun Yat Sen Univ, Dept Mat & Optoelect Sci, Kaohsiung 80424, Taiwan
关键词
monolithic zirconia crown; thickness; dental implant prosthesis; cyclic loading; finite element analysis; TOOTH WEAR; FAILURE LOAD; MANAGEMENT; COMPLICATIONS; OCCLUSION; CERAMICS; THERAPY; DESIGN; SLEEP;
D O I
10.3390/ma12101623
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
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页数:11
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