Jiménez-Melendo Manuel, Llena-Blasco Oriol, Bruguera August, Llena-Blasco Jaime, Yáñez-Vico Rosa-María, García-Calderón Manuel, Vaquero-Aguilar Cristina, Velázquez-Cayón Rocío, Gutiérrez-Pérez José-Luis, Torres-Lagares Daniel
Department of Condensed Matter Physics, University of Seville, 41012, Seville, Spain.
Private dental practice. Barcelona, Spain.
J Clin Exp Dent. 2014 Dec 1;6(5):e485-90. doi: 10.4317/jced.51442. eCollection 2014 Dec.
This study was undertaken to characterize the mechanical response of bare (as-received) and single-layer ceramized zirconia abutments with both internal and external connections that have been developed to enhanced aesthetic restorations.
Sixteen zirconia implant abutments (ZiReal Post®, Biomet 3i, USA) with internal and external connections have been analyzed. Half of the specimens were coated with a 0.5mm-thick layer of a low-fusing fluroapatite ceramic. Mechanical tests were carried out under static (constant cross-head speed of 1mm/min until fracture) and dynamic (between 100 and 400N at a frequency of 1Hz) loading conditions. The failure location was identified by electron microscopy. The removal torque of the retaining screws after testing was also evaluated.
The average fracture strength was above 300N for all the abutments, regardless of connection geometry and coating. In most of the cases (94%), failure occurred by abutment fracture. No significant differences were observed either in fatigue behavior and removal torque between the different abutment groups.
Mechanical behavior of Zireal zirconia abutments is independent of the type of internal/external connection and the presence/absence of ceramic coating. This may be clinically valuable in dental rehabilitation to improve the aesthetic outcome of zirconia-based dental implant systems. Key words:Dental implant, zirconia, ceramic structure, mechanical properties.
本研究旨在表征裸露（收货时状态）以及具有内外连接的单层陶瓷化氧化锆基台的力学响应，这些基台是为增强美学修复而开发的。
分析了16个具有内外连接的氧化锆种植体基台（ZiReal Post®，美国Biomet 3i公司）。一半的样本涂有一层0.5毫米厚的低熔氟磷灰石陶瓷。在静态（恒定十字头速度为1毫米/分钟直至断裂）和动态（在100至400牛之间，频率为1赫兹）加载条件下进行力学测试。通过电子显微镜确定失效位置。测试后还评估了固位螺钉的拆卸扭矩。
无论连接几何形状和涂层如何，所有基台的平均断裂强度均高于300牛。在大多数情况下（94%），失效是由基台断裂引起的。不同基台组之间在疲劳行为和拆卸扭矩方面均未观察到显著差异。
ZiReal氧化锆基台的力学行为与内外连接类型以及陶瓷涂层的有无无关。这在牙齿修复中对于改善基于氧化锆的牙种植系统的美学效果可能具有临床价值。关键词：牙种植体；氧化锆；陶瓷结构；力学性能。
