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首页> 外文期刊>The Journal of Prosthetic Dentistry >Effect of processing method on the dimensional accuracy and water sorption of acrylic resin dentures.
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Effect of processing method on the dimensional accuracy and water sorption of acrylic resin dentures.

机译：加工方法对丙烯酸树脂假牙的尺寸精度和吸水率的影响。

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STATEMENT OF PROBLEM: Acrylic resin complete dentures exhibit certain unavoidable dimensional changes. Processing shrinkage and expansion due to water uptake are 2 important aspects influencing dimensional accuracy. PURPOSE: This study investigated linear dimensional changes and water sorption of dentures processed by dry and wet heat with different rates of cooling. METHODS: Fine crosses marked on tinfoil inserts were placed at the incisive papilla and tuberosity regions of edentulous maxillary casts and incorporated into the dentures during polymerization by 3 processing techniques. A traveling microscope was used to measure the distances between the reference points to determine dimensional changes. Water uptake and content were determined by the mass changes of the dentures with an electronic balance. Data of linear dimensional change and water sorption were analyzed by multivariate analysis of variance and analysis of variance, respectively. Bonferroni simultaneous confidence intervals (95%) were applied for multiple comparison. RESULTS: Dry heat-processed and water bath-processed acrylic resin dentures did not exhibit significant differences in shrinkage (0.42% to 0.58%) at water saturation. Amounts of water sorption of dentures processed by dry and wet heat (0.50 and 0.48 mass%, respectively) were not significantly different, and their associated expansion did not entirely compensate for the processing shrinkage. The initial water content of dry heat-processed dentures (1.77 mass%) was unexpectedly slightly higher than that of wet heat-processed dentures (1.68 mass%). The rate at which the dentures cooled did not affect their initial water content and subsequent water uptake. CONCLUSIONS: Water uptake of dry and wet heat-processed acrylic resin dentures after deflasking was in both cases low, and the dentures did not reveal significant differences in shrinkage at water saturation. Air oven-processed and water bath-processed acrylic resin dentures show similar dimensional shrinkage at water saturation.
机译：问题陈述：丙烯酸树脂全口义齿表现出某些不可避免的尺寸变化。由于吸水引起的加工收缩和膨胀是影响尺寸精度的两个重要方面。目的：本研究调查了在不同冷却速率下通过干热和湿热处理的假牙的线性尺寸变化和吸水率。方法：将标记在锡箔插入物上的细十字放置在无牙上颌铸型的尖锐乳头和结节区域，并在聚合过程中通过3种加工技术掺入假牙中。使用移动显微镜测量参考点之间的距离，以确定尺寸变化。吸水率和含量由具有电子天平的义齿的质量变化确定。分别通过多元方差分析和方差分析来分析线性尺寸变化和吸水率的数据。将Bonferroni同时置信区间（95％）用于多重比较。结果：干热加工和水浴加工的丙烯酸树脂假牙在水饱和时收缩率没有显着差异（0.42％至0.58％）。通过干热法和湿热法（分别为0.50和0.48质量％）处理的假牙的吸水量没有显着差异，并且它们的相关膨胀不能完全补偿处理收缩。出乎意料的是，干热处理的假牙的初始含水量（1.77质量％）比湿热处理的假牙的初始含水量（1.68质量％）高。假牙的冷却速度不影响其初始含水量和随后的吸水率。结论在两种情况下，脱皮后干法和湿法热加工丙烯酸树脂义齿的吸水率均较低，并且在水饱和时义齿的收缩率没有显着差异。空气烤箱处理和水浴处理的丙烯酸树脂义齿在水饱和时显示出相似的尺寸收缩率。

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