Journal of Prosthodontics News
December 1, 2020
Mechanical Behavior and Fracture Loads of Lithium Disilicate Implant‐Supported Crowns
Now online in the Journal of Prosthodontics, an evaluation of fatigue survival, fracture loads and failure modes of monolithic lithium disilicate screw‐retained crowns and cement‐retained crowns.
Previous studies have reported more technical complications in screw-retained crowns, and more frequent biological complications in cement-retained restorations.
For this study, internal tapered connection implants were restored with lithium disilicate restorations, simulating a maxillary premolar with the two different designs (screw-retained and cement-retained).
All specimens survived the cyclic mechanical loading and the fracture load was significantly higher for screw‐retained crowns. A fractographic analysis was performed to identify fractographic marks and understand fracture mechanics.
The authors conclude that the use of a titanium insert to support a monolithic restoration enhances the fracture strength of the crown/abutment system.
Pessin Camatta H, Melim Ferreira R, Mota Ferrairo B, et al: Mechanical behavior and fracture loads of screw‐retained and cement‐retained lithium disilicate implant‐supported crowns. J Prosthodont 2020. Accepted Author Manuscript. https://doi.org/10.1111/jopr.13298
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