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首页> 外文期刊>The Journal of Prosthetic Dentistry >Dental diamond burs made with a new technology.
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Dental diamond burs made with a new technology.

机译：用新技术制成的牙科钻石针。

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STATEMENT OF PROBLEM: Conventional diamond burs show several limitations such as the heterogeneity of grain shapes, the difficulty of automation during fabrication, the decrease of cutting effectiveness due to repeated sterilization, and short lifetime. An additional shortcoming may be represented by the potential release of Ni+2 ions from the metallic binder into the body fluids. PURPOSE: This study investigated a new diamond rotative instrument made of a continuous diamond film obtained by chemical vapor deposition (CVD). This bur, characterized by a pure diamond cutting surface without metallic binder between crystals, was compared with a conventional diamond bur. MATERIAL AND METHODS: Cutting tests were followed by SEM examination and electron microprobe analysis (EMA) to trace metallic residues both at the surface of the bur and the substrate. RESULTS: EMA demonstrated that the metals Ni, Cr, Si, and Fe were present in the metallic binder matrix of the conventional bur and could be smeared on the surface of the substrate during cutting. SEM showed that significant loss of diamond particles occurred during cutting. On the other hand, no discrete particles sheared off the CVD bur. The smearing of the metallic binder cannot occur using the new bur. CONCLUSION: The new CVD bur not only proves to be more efficient in its cutting ability and longevity, but also excludes the risk of metal contamination. This last aspect concerns both the pollution of the oral environment and the contamination of the ceramic during the laboratory manufacturing of dental restorations.
机译：问题陈述：传统的金刚石车针显示出一些局限性，例如晶粒形状的异质性，制造过程中自动化的难度，由于反复灭菌而导致的切割效率降低以及使用寿命短。 Ni + 2离子可能从金属粘合剂释放到体液中可能代表了另一个缺点。目的：本研究研究了一种新的金刚石旋转仪器，该仪器由通过化学气相沉积（CVD）获得的连续金刚石膜制成。将这种车针的特征是纯金刚石切割表面，晶体之间没有金属结合剂，并与常规金刚石车针进行了比较。材料与方法：切削测试后进行SEM检查和电子微探针分析（EMA），以探查车针表面和基材表面的金属残留物。结果：EMA表明，金属Ni，Cr，Si和Fe存在于常规bur的金属粘合剂基体中，并且在切割过程中可能会涂抹在基材表面上。 SEM显示在切割过程中发生了金刚石颗粒的显着损失。另一方面，没有离散的颗粒从CVD bur上切下。使用新的车针不会发生金属粘合剂的涂抹。结论：新型CVD车针不仅被证明具有更高的切削能力和使用寿命，而且还排除了金属污染的风险。最后一个方面涉及在牙科修复体的实验室制造过程中口腔环境的污染和陶瓷的污染。

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