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首页> 外文期刊>The Journal of Prosthetic Dentistry >Defects in hexed gold prosthetic screws: A metallographic and tensile analysis.
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Defects in hexed gold prosthetic screws: A metallographic and tensile analysis.

机译：六角金修复螺钉中的缺陷：金相和拉伸分析。

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STATEMENT OF PROBLEM: Prosthetic gold screw fracture remains a clinical problem in implant prosthodontics. PURPOSE: This study examined hexed gold prosthetic screws for internal defects and determined the effect of these defects on tensile strength. The microstructure, microhardness, and major constituents of the alloys also were determined. MATERIAL AND METHODS: Four intact hexed gold prosthetic screws, 1 from each of 2 different lots from 2 manufacturers (Implant Innovations and Nobel Biocare), were examined with standard metallographic techniques for defects, microstructure, microhardness, and major alloy constituents. Thirty-six screws, 9 from each of the 2 different lots of both manufacturers, were subjected to tensile testing to determine fracture load values. Analysis of variance and Tukey tests were used to identify differences between manufacturers and lots (P<.05). The fracture sites were examined retrospectively with a scanning electron microscope to identify defects that could have contributed to failure. The mode of fracture was characterized. RESULTS: There were no significant defects in the screws tested, but differences were observed in the microstructure, microhardness, alloy composition, and fracture load values for both manufacturers. Screws from the 2 manufacturers demonstrated distinctly different metallurgical characteristics, which highlighted differences in the manufacturing processes. Fracture load values ranged from 850 +/- 20 N to 1093 +/- 64 N. A significant difference was noted for mean fracture load values for the different lots of Implant Innovations screws (P<.05). Ductile fracture was the mode of failure. CONCLUSION: The results of this study suggest that variability in the physical properties of similar hexed gold prosthetic screws made by different manufacturers, as well as different lots from the same manufacturer, may affect clinical success.
机译：问题陈述：假体金螺钉断裂仍然是植入物修复术中的临床问题。目的：这项研究检查了六角形金修复螺钉的内部缺陷，并确定了这些缺陷对拉伸强度的影响。还确定了合金的显微组织，显微硬度和主要成分。材料和方法：用标准金相技术检查了4个完整的六角形义齿义齿，分别来自2个制造商（Implant Innovations和Nobel Biocare）的2个不同批次中的每一个，以检查缺陷，显微组织，显微硬度和主要合金成分。两家制造商的2个不同批次中的36个螺钉（分别来自9个）分别进行了拉伸测试，以确定断裂载荷值。方差分析和Tukey检验用于确定制造商与批次之间的差异（P <.05）。用扫描电子显微镜对骨折部位进行回顾性检查，以发现可能导致失效的缺陷。表征了断裂方式。结果：所测试的螺钉没有明显的缺陷，但是两家公司的显微组织，显微硬度，合金成分和断裂载荷值均存在差异。这两家制造商生产的螺丝具有明显不同的冶金特性，突出了制造工艺的差异。骨折负荷值的范围为850 +/- 20 N至1093 +/- 64N。对于不同批次的Implant Innovations螺钉，平均骨折负荷值存在显着差异（P <.05）。韧性断裂是破坏的方式。结论：这项研究的结果表明，不同制造商制造的相似六角金假牙螺钉的物理特性差异，以及同一制造商制造的不同批号，可能会影响临床成功。

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