Department of Prosthodontics, Faculty of Dentistry, Cukurova University, Faculty of Dentistry, Balcali, Adana, Turkey.
J Prosthet Dent. 2011 Sep;106(3):170-8. doi: 10.1016/S0022-3913(11)60116-9.
Casting a high-gold alloy to a wrought prefabricated noble implant-component increases the cost of an implant. Selecting a less expensive noble alloy would decrease implant treatment costs.
The purpose of this study was to investigate the interfacial regions of a representative noble implant component and cast noble dental alloys and to evaluate the effects of porcelain firing cycles on the interface.
Six representative alloys (n=3) were cast to gold implant abutments (ComOcta). Scanning electron microscopy (SEM) was used to characterize microstructures. Compositions of interfacial regions and bulk alloys were obtained by energy-dispersive spectroscopy. Vickers hardness was also measured across the interface. By using Micro-X-ray diffraction, the phases were evaluated at 7 points perpendicular to the interface. The effects of porcelain firing cycles on microstructures, diffusion, hardness, and phases were also evaluated. For statistical evaluation of diffusion length and hardness, a 3-way repeated measures ANOVA was used. Pairwise comparisons of interest were conducted with Tukey pairwise comparisons or, when a significant interaction was found, Bonferroni-adjusted t-tests (overall α=.05).
Microstructures of bulk alloys were predominantly maintained to a well-defined boundary for both as-cast and heat-treated conditions. An interaction band, 5-6 μm wide, was observed. The alloy grain size at the interface and the interaction band width increased after simulated porcelain firing. The extent of elemental diffusion from the interface was about 30 μm and not affected by simulated porcelain firing. Differences in Vickers hardness for the alloys were consistent with their compositions. Micro-XRD patterns indicated that substantial amounts of new phases had not formed at the interfacial regions.
Less expensive noble alternatives to high-gold alloys provided comparable metallurgical compatibility with the noble implant component.
将高金合金铸造到预成型的锻造贵金属植入物部件上会增加植入物的成本。选择较便宜的贵金属合金会降低植入物治疗的成本。
本研究的目的是研究代表性贵金属植入物部件和铸造贵金属牙科合金的界面区域，并评估瓷烧制循环对界面的影响。
将六种代表性合金（n=3）铸造到金植入体接头上（ComOcta）。扫描电子显微镜（SEM）用于表征微观结构。通过能谱分析获得界面区域和块状合金的成分。还测量了横跨界面的维氏硬度。通过使用微 X 射线衍射，在垂直于界面的 7 个点评估了相。还评估了瓷烧制循环对微观结构、扩散、硬度和相的影响。为了评估扩散长度和硬度的统计数据，使用了三向重复测量 ANOVA。使用 Tukey 两两比较或在发现显著相互作用时使用 Bonferroni 调整的 t 检验（总体α=0.05）进行了感兴趣的两两比较。
在铸造和热处理条件下，大块合金的微观结构主要保持到明确的边界。观察到一个 5-6μm 宽的相互作用带。在模拟瓷烧制后，界面处的合金晶粒尺寸和相互作用带宽增加。从界面扩散的元素量约为 30μm，不受模拟瓷烧制的影响。合金的维氏硬度差异与其成分一致。微 XRD 图谱表明，在界面区域没有形成大量新相。
与高金合金相比，较便宜的贵金属替代品与贵金属植入物部件具有相当的冶金相容性。
