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排序方式: 共有665条查询结果,搜索用时 15 毫秒
661.
Stuti Dang MD MPH Sandra Garcia-Davis MPH CPH Polly H. Noël PhD Jared Hansen MS Benjamin J. Brintz PhD Richard Munoz PhD MSEd Willy Marcos Valencia Rodrigo MD Rand Rupper MD Erin D. Bouldin PhD MPH Ranak Trivedi PhD Lauren S. Penney PhD MA Mary Jo Pugh PhD Bruce Kinosian MD Orna Intrator PhD Luci K. Leykum MD MSC MBA the Elizabeth Dole Center of Excellence for Veteran Caregiver Research Team 《Journal of the American Geriatrics Society》2023,71(12):3814-3825
662.
663.
664.
Mayara dos Santos Noronha DDS MSC PhD Marco Aurélio de Carvalho DDS MSC PhD Anh Quynh Do DDS Vitaliano Gomes de Araújo Neto DDS MSC PhD Student Camila Heitor Campos DDS MSC PhD Marcelo Giannini DDS MSC PhD Pascal Magne DDS MSC PhD 《Journal of prosthodontics》2023,32(2):e19-e29
Purpose
To evaluate the influence of the thickness and type of computer-aided design and computer-aided manufacturing (CAD-CAM) material on the fatigue resistance and failure mode of endodontically treated teeth (ETT) restored with occlusal veneers (OV).Materials and methods
Seventy-five (N = 75) ETT were restored with Herculite XRV in the endodontic access. Five experimental groups (n = 15) were tested. Four groups had two different thicknesses (0.6-0.7 mm or 1.4-1.6 mm) and two different CAD-CAM materials: zirconia-reinforced lithium-silicate (LS/Celtra Duo) and composite resin (RC/Cerasmart). The fifth group (control) did not have occlusal veneers. All the specimens were subjected to accelerated fatigue (5 Hz frequency) with an occlusal load increasing up to 1800 N and 131,000 cycles. The number of cycles was recorded when the machine stopped or at the completion of the test. Fatigue resistance was analyzed using the Kaplan-Meier survival test (95% significance level, log-rank post hoc pairwise comparisons). The samples were categorized according to failure mode. The CAD-CAM materials were examined through scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS).Results
No differences were found between the thicknesses, regardless of the type of the CAD-CAM material. The thick LS OV outperformed the RC and control groups. The thin RC OV and control groups showed a higher percentage of repairable and possibly repairable failures than the other groups. LS was more homogeneous under SEM, and the EDS analysis detected Si and Zr, but not Li.Conclusions
A larger thickness did not improve the resistance of the CAD-CAM materials. Thick LS showed a higher cumulative survival rate to fatigue than the RC and control groups. The direct composite alone (control) survived similarly to the experimental groups, except for the thick LS. 相似文献665.