Stimmelmayr Michael, Heiß Philipp, Erdelt Kurt, Schweiger Josef, Beuer Florian
Int J Comput Dent. 2017;20(1):53-64.
To test the mechanical properties of three different restorative materials for implant abutments supporting all-ceramic single crowns.
Thirty implants with butt-joint connections were distributed into three test groups: Group A with 10 one-piece zirconia abutments, Group U with 10 titanium abutments, and Group T with 10 titanium-zirconia hybrid abutments. Monolithic zirconia single crowns were cemented and artificially aged. The crowns were loaded at a 30-degree angle in a universal testing machine until fracture or bending. Additionally, after removal of the restorations, the implant-abutment interface of the fixtures was inspected using a scanning electron microscope (SEM).
In Group A, the abutments failed on average at 336.78 N, in Group U at 1000.12 N, and in Group T at 1296.55 N. The mean values between Groups T and U (P = 0.009), and between Group A and Groups T and U (P < 0.001) were significantly different. The abutments in Group A failed early due to fractures of the internal parts and parts close to the implant neck. In Groups T and U, failures occurred due to bending of the implant neck.
This experimental study proves that hybrid and titanium abutments have similar mechanical properties. One-piece abutments made of zirconia showed significantly lower fracture resistance.
测试三种不同的种植体基台修复材料支持全瓷单冠的力学性能。
30个具有对接连接的种植体被分为三个测试组：A组有10个一体式氧化锆基台，U组有10个钛基台，T组有10个钛 - 氧化锆混合基台。将整体式氧化锆单冠粘结并人工老化。在万能试验机中以30度角对冠进行加载，直至断裂或弯曲。此外，在去除修复体后，使用扫描电子显微镜（SEM）检查种植体 - 基台界面的固定装置。
A组基台平均在336.78 N时失效，U组在1000.12 N时失效，T组在1296.55 N时失效。T组和U组之间（P = 0.009）以及A组与T组和U组之间（P < 0.001）的平均值有显著差异。A组基台因内部部件和靠近种植体颈部的部件骨折而早期失效。在T组和U组中，失效是由于种植体颈部弯曲。
本实验研究证明混合基台和钛基台具有相似的力学性能。由氧化锆制成的一体式基台显示出显著较低的抗断裂性。
