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首页> 外文期刊>The Journal of Prosthetic Dentistry >Comparison of accuracy between compression- and injection-molded complete dentures.
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Comparison of accuracy between compression- and injection-molded complete dentures.

机译：比较压模和注模全口义齿的精度。

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STATEMENT OF PROBLEM: A clinically significant incisal pin opening may occur after processing complete dentures if a compression molding technique is used. To recover the proper vertical dimension of occlusion, a time-consuming occlusal adjustment is necessary that often destroys the anatomy of the artificial teeth. A new injection molding process claims to produce dentures that require few, if any, occlusal adjustments in the laboratory after processing. PURPOSE: This laboratory study compared incisal pin opening, dimensional accuracy, and laboratory working time for dentures fabricated by this new injection system with dentures constructed by the conventional compression molding technique. MATERIAL AND METHODS: Two groups of 6 maxillary and 6 mandibular dentures were evaluated as follows: group 1 (control), Lucitone 199, compression molded with a long cure cycle; and group 2, Lucitone 199, injection molded with a long cure. Incisal pin opening was measured with a micrometer immediately after deflasking. A computerized coordinate measuring machine was used to measure dimensional accuracy of 3-dimensional variations in selected positions of artificial teeth in 4 stages of denture fabrication. Analysis of variance (ANOVA) and t tests were performed to compare the groups. RESULTS: A significant difference was found in pin opening between groups (t test). Horizontal dimensional changes evaluated with repeated measures ANOVA revealed no significant differences between groups. However, analysis of vertical dimensional changes disclosed significant differences between the groups. There was no appreciable difference in laboratory working time for flasking and molding denture bases between the injection and compression molding techniques when polymethyl methacrylate resin was used. CONCLUSION: The injection molding method produced a significantly smaller incisal pin opening over the standard compression molding technique. The injection molding technique, using polymethyl methacrylate, was a more accurate method for processing dentures. There were no appreciable differences in laboratory working time between the injection and compression molding techniques.
机译：问题陈述：如果使用压缩成型技术，则在处理完整的义齿后可能会发生临床上显着的切牙销开口。为了恢复正确的咬合垂直尺寸，必须进行耗时的咬合调整，这通常会破坏人造牙的解剖结构。一种新的注射成型工艺声称可以生产出在加工后几乎不需要在实验室进行咬合调整的义齿。目的：本实验室研究比较了这种新型注射系统与传统压模技术制造的假牙所制成的假牙的切齿开口度，尺寸精度和实验室工作时间。材料和方法：两组6个上颌假牙和6个下颌假牙的评估如下：第1组（对照组），Lucitone 199，压模成型，固化周期长。第二组，Lucitone 199，经长期固化而注塑成型。剥落后立即用千分尺测量切开的顶针。使用计算机坐标测量机在义齿制造的四个阶段中，测量人造牙齿选定位置的3维变化的尺寸精度。进行方差分析（ANOVA）和t检验以比较各组。结果：两组之间的针脚打开量存在显着差异（t检验）。使用重复测量方差分析评估的水平尺寸变化显示各组之间无显着差异。然而，对垂直尺寸变化的分析揭示了两组之间的显着差异。当使用聚甲基丙烯酸甲酯树脂时，在注射和压塑技术之间，用于烧瓶和义齿基托的实验室工作时间没有明显差异。结论：注射成型方法比标准压缩成型技术产生的切齿开口小得多。使用聚甲基丙烯酸甲酯的注射成型技术是加工假牙的更准确方法。注塑和压塑技术之间的实验室工作时间没有明显差异。

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