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首页> 外文期刊>The Journal of Prosthetic Dentistry >Marginal fit of nickel-chromium copings before and after internal adjustments with duplicated stone dies and disclosing agent.
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Marginal fit of nickel-chromium copings before and after internal adjustments with duplicated stone dies and disclosing agent.

机译：在进行内部调整之前和之后使用重复的石材模具和显露剂对镍铬合金顶盖进行边际拟合。

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摘要

STATEMENT OF PROBLEM: Despite careful procedures, master stone dies may be damaged during laboratory procedures. The dentist routinely adjusts castings because the marginal fit of casting is not as accurate as on the dies. PURPOSE: This study evaluated the technique of internal adjustment of castings with use of duplicated stone dies and a disclosing agent to improve marginal fit discrepancy. MATERIAL AND METHODS: Thirty-two nickel-chromium copings were fabricated and simulated standard clinical and laboratory procedures with 2 variables: tooth preparation convergence angles of 6 and 18 degrees, with or without internal relief. Master stone dies and their duplicates were selected for coping construction and internal adjustment, respectively. A specimen positioning device was coupled with a Toolmakers microscope to allow reproducibility of measurements. Each coping was evaluated at 8 locations of its marginal perimeter, before and after internal adjustment. RESULTS: Marginal fit discrepancy of copings were significantly reduced with an internal adjustment technique (mean > 52%) for all experimental groups. Tooth preparations with greater convergence and internally relieved castings recorded a better marginal fit. CONCLUSION: The casting internal adjustment technique with use of duplicated stone dies and a disclosing agent substantially reduced marginal fit discrepancy.
机译：问题陈述：尽管进行了仔细的操作，但在实验室操作过程中可能会损坏原石模具。牙医会定期调整铸件，因为铸件的边缘配合不如在模具上精确。目的：本研究评估了通过使用重复的石模和一种可提高边缘拟合差异性的显示剂对铸件进行内部调整的技术。材料与方法：制作了32个镍铬合金顶盖，并模拟了具有2个变量的标准临床和实验室程序：牙齿预备会聚角为6度和18度，有或没有内部凸纹。分别选择了主石模及其复制品以应对建筑和内部调整。将标本定位设备与Toolmakers显微镜结合使用，以实现测量的可重复性。在内部调整之前和之后，在边缘周围的8个位置评估每个应对方法。结果：所有实验组的内部调整技术（均值> 52％）均显着降低了应对措施的边际拟合差异。具有更高收敛性和内部松脱铸件的牙齿预备件具有更好的边缘配合。结论：使用重复的石模和显露剂的铸造内部调整技术可显着降低边缘配合误差。

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