Division of Dental Materials and Engineering, Department of Reconstructive Dentistry, University Center for Dental Medicine, University of Basel, Basel, Switzerland.
Clinic of Fixed and Removable Prosthodontics and Dental Material Science, Center of Dental Medicine, University of Zurich, Zurich, Switzerland.
J Prosthodont Res. 2019 Jul;63(3):361-367. doi: 10.1016/j.jpor.2019.02.002. Epub 2019 Mar 8.
To test three potential prosthetic material options for zirconia implants in regard to their mechanical properties, loading and retention capacity as well as to record abrasion after chewing simulation followed by thermocyclic aging.
Molar crowns (n = 96) of three different computer-aided design/computer-aided manufacturing (CAD/CAM) materials were produced and cemented on zirconia implants (ceramic.implant, Vita) with a diameter of 4.5 mm. Monolithic zirconia (Vita YZ [YZ] with RelyX Unicem 2 Automix [RUN], polymer-infiltrated ceramic (Vita Enamic [VE]) with Vita Adiva F-Cem [VAF] and acrylate polymer (CAD Temp [CT]) with RelyX Ultimate [RUL]. Fracture load and retentive force of the crowns were measured after 24 h water storage at 37 °C and after a chewing simulation followed by thermocyclic aging. Abrasion was recorded by matching stereolithography-data of the crowns obtained before and after chewing simulation. Additionally, the mechanical properties and bonding capabilities of the crown and cement materials were assessed.
Fracture load values were significantly highest for YZ > VE = CT. Retention force values did not differ significantly between the materials. The aging procedure did not affect the fracture load values nor the retention force significantly. Abrasion depth of the crowns was lowest for YZ followed by VE and CT. On unpolished crowns, abrasion of YZ and VE tended to be higher than on polished specimens.
Based on the obtained in-vitro results, all tested materials can be recommended for the use on zirconia implants, although CT is only approved for temporary crowns. The loading and retention capacity of the materials were not significantly affected by aging.
测试三种潜在的氧化锆种植体修复体材料在机械性能、负载和保持能力方面的表现，并记录咀嚼模拟后的磨损情况，然后进行热循环老化。
制作了 96 个三种不同的计算机辅助设计/计算机辅助制造（CAD/CAM）材料的磨牙冠，并使用直径为 4.5mm 的氧化锆植入物（陶瓷植入物，Vita）进行粘结。氧化锆全瓷冠（Vita YZ [YZ]与 RelyX Unicem 2 Automix [RUN]，聚合物渗透陶瓷（Vita Enamic [VE]）与 Vita Adiva F-Cem [VAF]，丙烯酸酯聚合物（CAD Temp [CT]）与 RelyX Ultimate [RUL]。在 37°C 水中储存 24 小时后以及咀嚼模拟后进行热循环老化后，测量冠的断裂载荷和保持力。通过匹配咀嚼模拟前后获得的冠的立体光刻数据记录磨损情况。此外，还评估了冠和粘结材料的机械性能和粘结能力。
YZ 的断裂载荷值显著最高，其次是 VE 和 CT。材料之间的保持力值没有显著差异。老化程序对断裂载荷值和保持力值均无显著影响。冠的磨损深度最低的是 YZ，其次是 VE 和 CT。在未经抛光的冠上，YZ 和 VE 的磨损程度高于抛光标本。
根据体外实验结果，所有测试的材料都可以推荐用于氧化锆种植体，尽管 CT 仅批准用于临时冠。材料的负载和保持能力不受老化的显著影响。
