OWN - Quintessenz Verlags-GmbH CI - Copyright Quintessenz Verlags-GmbH OCI - Copyright Quintessenz Verlags-GmbH TA - Int J Prosthodont JT - The International Journal of Prosthodontics IS - 1942-4426 (Electronic) IS - 0893-2174 (Print) IP - 4 VI - 35 PST - ppublish DP - 2022 PG - 509-511 LA - en TI - Are Monolithic 3Y-TZP Zirconia Crowns Too Strong for Titanium Implants? LID - 10.11607/ijp.7322 [doi] FAU - Güth, Jan-Frederik AU - Güth J FAU - Schweiger, Josef AU - Schweiger J FAU - Graf, Tobias AU - Graf T FAU - Stimmelmayr, Michael AU - Stimmelmayr M FAU - Schubert, Oliver AU - Schubert O FAU - Erdelt, Kurt AU - Erdelt K CN - AB - Purpose: To assess whether material choice for the prosthetic component of an implant restoration influences the failure mode in case of occlusal overload in monolithic restorations fabricated from high-strength ceramics on titanium implants. Materials and Methods: Within this pilot study, finite element analysis (FEA) was conducted to simulate stress and deformation of implant-supported crowns fabricated from lithium disilicate (LiS2) and zirconia (3Y-TZP). Additionally, an in vitro load-to-failure test was conducted using two specimens per group to evaluate the failure mode and to confirm the findings from the FEA. Results/ Conclusion: FEA revealed stress areas at the palatal cervical areas of the crowns. In the load-to-failure test, both LiS2 hybrid abutment crowns fractured (410 N and 510 N) before plastic deformation of the metal implant components could be detected. The 3Y-TZP monolithic hybrid abutment crowns did not fracture until the tests were interrupted at 646-N and 690-N occlusal force, when plastic deformation of the metal implant components was visually observed. AID - 1088909