CAD/CAM lithium disilicate ceramic crowns: Effect of occlusal thickness on fracture resistance and fractographic analysis

This study uses fracture tests and fractographical analysis to compare computer-aided design and computer-aided manufacturing (CAD/CAM) lithium disilicate molar crowns with the previous occlusal thickness recommendation of 1.5-mm, the new recommendation of 1.0-mm, and a less invasive thickness of 0.8-mm. After fatigue application, fracture tests and fractographic analysis were conducted. The fracture resistance of CAD/CAM lithium disilicate molar crowns was different depending on the occlusal thickness of the restoration, and decreased with lower the thickness. However, the fracture resistance of crowns of all three thicknesses exceeded the reported maximum bite force in the first molar region after the fatigue process, and can be considered acceptable for use in the clinic. © 2022, Japanese Society for Dental Materials and Devices. All rights reserved.

Bite force; Dental prosthesis; Dental restoration failure; Dental stress analysis Computer aided analysis; Computer aided design; Dental prostheses; Fatigue of materials; Filling; Fracture; Fracture testing; Fracture toughness; Lithium compounds; Restoration; Bite force; Computer-aided design; Computer-aided manufacturing; Dental restoration failure; Dental restorations; Dental stress; Dental stress analyse; Fractographic analysis; Lithium disilicate; Stresses analysis; Stress analysis; dental porcelain; lithia disilicate; ceramics; computer aided design; dental procedure; dental restoration; fatigue; human; materials testing; prosthesis design; tooth crown; Ceramics; Computer-Aided Design; Crowns; Dental Porcelain; Dental Prosthesis Design; Dental Restoration Failure; Dental Stress Analysis; Fatigue; Humans; Materials Testing

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