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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of wax melting range and investment liquid concentration on the accuracy of a three-quarter crown casting.
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Effect of wax melting range and investment liquid concentration on the accuracy of a three-quarter crown casting.

机译：蜡的熔化范围和精炼液浓度对四分之三冠铸件精度的影响。

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STATEMENT OF PROBLEM: Dental casting accuracy is influenced by the setting expansion of investment materials. Although setting expansion can help compensate for casting shrinkage, it cannot be fully realized under a confined wax pattern. Exactly how soft a wax pattern should be to ensure optimum setting expansion has not been determined. PURPOSE: In this study, the relationship between wax characteristics and the casting accuracy of a three-quarter crown was investigated. MATERIAL AND METHODS: Four different wax materials were used: paraffin 135 with a softening temperature of 37.5 degrees C (P38), paraffin 1080 with a softening temperature of 63.5 degrees C, Shofu Red with a softening temperature of 41.5 degrees C, and Shofu Hard with a softening temperature of 51 degrees C. Two mixtures of phosphate-bonded investment were prepared: one with 100% special liquid and another with 75% special liquid plus 25% distilled water. For both, the liquid/powder ratio was 16:100. A type IV gold alloy was cast into a three-quarter crown mold. The discrepancy at 6 locations (1 lingual, 1 mesial, 1 distal, and 3 facial) was measured with a traveling microscope. Five readings were collected. Means and standard deviations were calculated for all data. A 2-way analysis of variance followed by the Student-Newman-Keuls test for multiple comparisons was used to identify significant differences between groups at the 95% confidence level. RESULTS: For the gingival measurement sites (lingual, mesial, and distal), there was no significant difference in cast adaptation when Shofu Hard and paraffin 1080 waxes were used. However, the results with these 2 waxes were different than with Shofu Red and P38. For the 3 facial measurement sites, significantly different measurements were found for each wax; P38 demonstrated the best results. Casting shrinkage was smaller with the use of 100% special liquid. CONCLUSION: Within the limitations of this study, casting shrinkage was affected by the type of wax used and was sensitive to the site at which dimensional measurements were performed. The higher the softening temperature, the larger the casting shrinkage.
机译：问题陈述：铸造牙的精度受备用材料设置的扩展影响。尽管定型膨胀可以帮助补偿铸件的收缩，但在密闭的蜡型下无法完全实现。到底蜡模到底应该有多软才能确保最佳的定型膨胀还没有确定。目的：在这项研究中，研究了蜡特性与四分之三冠的铸造精度之间的关系。材料和方法：使用了四种不同的蜡材料：软化温度为37.5摄氏度（P38）的石蜡135，软化温度为63.5摄氏度的石蜡1080，软化温度为41.5摄氏度的松风红和松软硬质的软化温度为51摄氏度。制备了两种磷酸酯键合的混合物：一种为100％特殊液体，另一种为75％特殊液体加25％蒸馏水。两者的液/粉比均为16：100。将IV型金合金铸造到四分之三的冠状模具中。用移动显微镜测量6个位置（舌1个，内侧1个，远端1个和面部3个）的差异。收集了五个读数。计算所有数据的平均值和标准偏差。使用方差的2-way分析，然后进行Student-Newman-Keuls检验进行多次比较，以在95％置信水平下确定组之间的显着差异。结果：对于牙龈测量部位（舌侧，内侧和远端），当使用Shofu Hard和石蜡1080蜡时，铸模适应性无显着差异。但是，这两种蜡的结果与Shofu Red和P38的结果不同。对于3个面部测量部位，每种蜡的测量结果差异显着。 P38表现出最好的结果。使用100％的特殊液体，铸件收缩率较小。结论：在本研究的范围内，铸件收缩率受所用蜡的类型影响，并且对进行尺寸测量的部位敏感。软化温度越高，铸件收缩率越大。

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