Dimensional accuracy of stone casts obtained with multiple pours into the same mold.

ISRN dentistry Pub Date : 2012-01-01 Epub Date: 2012-12-24 DOI:10.5402/2012/730674
Valdimar da Silva Valente, Artêmio Luiz Zanetti, Pedro Paulo Feltrin, Ricardo Tatsuo Inoue, Carmem Dolores Vilarinho Soares de Moura, Luiz Evaldo de Moura Pádua
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引用次数: 8

Abstract

Aim. The aim of the present study was to compare the dimensional accuracy of stone casts obtained with vinyl polysiloxane molds through the double-impression technique with three pours into the same mold. Methods. A stainless steel master model was constructed simulating a three-unit fixed prosthesis. Twelve impressions were taken of this master model with addition silicone, using the double-impression technique. Three pours of type IV gypsum were then made into each mold, thus producing 36 casts. The pours were made 1 hour, 6 hours and 24 hours after the impression procedure. Next, intra- and interabutment measurements were made in a coordinate measuring machine. Results. Comparative analysis of the dimensional accuracy of stone casts resulting from multiple pours was not statistically significant in pours first and second (P > 0.05). These values, however, were statistically significant at third pour in the height in abutment 1 and upper distance interabutment. Conclusion. The wait time (1 hour, and 6 hours) observed before pouring the stone into the same molds did not cause significant dimensional accuracy of the casts.

Abstract Image

Abstract Image

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在同一模具中多次浇注获得的石铸件尺寸精度。
的目标。本研究的目的是比较乙烯基聚硅氧烷模具通过三次注入同一模具的双压模技术获得的石头铸件的尺寸精度。方法。建立了一个模拟三单元固定假体的不锈钢主模型。使用双重印模技术,在这个主模型上添加了硅树脂,进行了十二次印模。然后在每个模具中倒入三次IV型石膏,从而生产36个铸件。分别在压印后1小时、6小时和24小时进行灌注。其次,在三坐标测量机上进行了基台内和基台间的测量。结果。多次浇筑的石模尺寸精度对比分析,第一次和第二次浇筑的石模尺寸精度差异无统计学意义(P > 0.05)。然而,这些值在第1基台高度和基台间上部距离的第三次灌注中具有统计学意义。结论。在将石头倒入相同的模具之前观察到的等待时间(1小时和6小时)并没有导致铸件的显着尺寸精度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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