Journal of Prosthodontics News
September 9, 2019
Fracture Resistance of Various Thickness e.max CAD Lithium Disilicate Crowns
Now online in the Journal of Prosthodontics, Drs. Sara Elizabeth Chen, Albert Christopher Park, Jingxu Wang, Kent L. Knoernschild, Stephen Campbell, and Bin Yang investigate the influence of abutment material properties on the fracture resistance and failure mode of lithium disilicate (IPS e.max) CAD/CAM (computer-aided design/manufacturing) crowns on traditionally and minimally prepared simulated tooth substrates.
They found that minimal thickness e.max crowns did not demonstrate statistical difference in fracture resistance from traditional thickness crowns. Fracture mechanisms of minimal thickness e.max crowns may be affected by the e-modulus of the substrate. Minimal thickness e.max crowns may be a viable restorative option when supported by high e-modulus materials.
This research won 1st place at the ACP's 2018 John J. Sharry Research Competition.
Chen S, Park A, Wang J, et al: Fracture Resistance of Various Thickness e.max CAD Lithium Disilicate Crowns Cemented on Different Supporting Substrates: An in vitro Study. J Prosthodont doi: 10.1111/jopr.13108
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