Journal
INTERNATIONAL JOURNAL OF PROSTHODONTICS
Volume 31, Issue 5, Pages 451-452Publisher
QUINTESSENCE PUBLISHING CO INC
DOI: 10.11607/ijp.5817
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Purpose: To evaluate the load at fracture and influence of artificial aging of posterior teeth occlusal veneers (table tops) made of two different ceramics. Materials and Methods: A total of 80 table tops were produced from feldspathic ceramic (VM) and zirconia-reinforced lithium silicate ceramic (CD) using computer-aided design/computer-assisted manufacturing (CAD/CAM). Half of the specimens from each ceramic were aged prior to the load test. Results: Mean +/- standard deviation (SD) load at fracture was significantly higher for CD (1,571.1 N +/- 297.0 N) than for VM (573.6 N +/- 86.4 N) (P < .001). After aging, load at fracture increased significantly to 1,819.0 N (+/- 310.6 N) for CD and to 745.2 N (+/- 168.3 N) for VM. Conclusion: The use of zirconia-reinforced lithium silicate ceramic for molar nonprep table tops should be uncomplicated according to the high load-at-fracture values. Mechanical stability of either ceramic is not compromised by aging.
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