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首页> 外文期刊>The Journal of Prosthetic Dentistry >The influence of tray type and other variables on the palatal depth of casts made from irreversible hydrocolloid impressions.
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The influence of tray type and other variables on the palatal depth of casts made from irreversible hydrocolloid impressions.

机译：托盘类型和其他变量对不可逆水胶体压模铸件的the深度的影响。

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STATEMENT OF PROBLEM: There are conflicting data regarding the effect of various factors on the palatal depth of casts made from irreversible hydrocolloid impressions. PURPOSE: This study examined the influence of tray type, water temperature, pouring technique, and stone expansion on the palatal depth of casts. MATERIAL AND METHODS: Irreversible hydrocolloid impressions were made of a model under simulated oral conditions. Palatal depth was measured relative to a reference plane with a microscope. The reference planes were standardized by subjecting the data to three 2-dimensional mathematic rotations. A 2-factor analysis of variance (alpha=.05) was used to determine whether differences existed among tray types and among palatal locations. RESULTS: The palatal depth of the casts increased approximately 0.06 mm compared with the master model with all but 2 variables. Statistical testing revealed that increased depth was not attributable to water temperature (52 degrees F or 72 degrees F) or tray type (custom resin, perforated metal, metal rimlock, or rimlock with built-up palate). Custom resin tray impressions poured with a lower expansion stone and perforated tray impressions inverted onto a base made from the same mix of stone resulted in casts with palatal depths most similar to that of the master model (P<.001). CONCLUSIONS:Casts with palatal contours of comparable accuracy were obtained with the use of a stock metal or customized tray and the use of differing water temperatures to mix the impression material.
机译：问题陈述：关于各种因素对不可逆的水胶体压痕铸件的depth深度的影响，存在相互矛盾的数据。目的：本研究检查了托盘类型，水温，浇注技术和石材膨胀对铸件the深度的影响。材料与方法：在模拟的口腔条件下，对模型制作了不可逆的水胶体印模。使用显微镜相对于参考平面测量骨深度。通过对数据进行三个二维数学旋转，可以对参考平面进行标准化。使用两因素方差分析（alpha = .05）来确定托盘类型之间和pa位置之间是否存在差异。结果：与母模型相比，除两个变量外，铸件的pa深度增加了约0.06 mm。统计测试表明，深度增加并非归因于水温（52华氏度或72华氏度）或托盘类型（定制树脂，穿孔金属，金属锁扣或带with味的锁扣）。用较低膨胀的石材倒入定制的树脂托盘印模，然后将穿孔的托盘印模倒置到由相同的石材混合料制成的底座上，产生的pa模深度与主模型最相似（P <.001）。结论：通过使用金属坯料或定制的托盘，以及使用不同的水温来混合压印材料，可以获得具有相当精度的contour轮​​廓的铸件。

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