Savirmath Abhishek, Mishra Vandita
Reader, Department of Prosthodontics, Sri Sai College of Dental Surgery , Vikarabad, Hyderabad, Telangana, India .
Senior Lecturer, Department of Periodontics, Sri Sai College of Dental Surgery , Vikarabad, Hyderabad, Telangana, India .
J Clin Diagn Res. 2016 Nov;10(11):ZC50-ZC54. doi: 10.7860/JCDR/2016/22066.8903. Epub 2016 Nov 1.
Close mucosal adaptation of denture base to the underlying mucosa is of prime importance for denture stability. This however can be affected by various temperature changes which the denture base undergoes during processing and also to its material properties.
The aim of the present study was to compare linear dimensional change of heat cure acrylic resin with three different cooling regimens on two different commercially available acrylic denture base resins.
Six groups of acrylic specimens with 10 samples each were prepared using either PYRAX or DPI acrylic resin, with a standard processing technique. Three different cooling methods were used for both the commercially available heat cure acrylic denture base resins. Linear dimensional changes were measured between three pre-determined points on the specimens of all the groups using a travelling microscope after removing the sample from the flask. One way ANOVA and unpaired t-test was used for statistical analysis.
Linear dimensional change was more in quenching followed by air and water bath method of cooling respectively. Amongst the materials, linear dimensional changes were more in PYRAX than in DPI acrylic.
Slow cooling by methods described should be advocated for better mucosal adaptation of the denture base.
义齿基托与下方黏膜紧密贴合对义齿稳定性至关重要。然而，这可能会受到义齿基托在加工过程中经历的各种温度变化及其材料特性的影响。
本研究旨在比较两种不同市售丙烯酸义齿基托树脂在三种不同冷却方式下热固化丙烯酸树脂的线性尺寸变化。
采用标准加工技术，使用PYRAX或DPI丙烯酸树脂制备六组丙烯酸标本，每组10个样本。两种市售热固化丙烯酸义齿基托树脂均采用三种不同的冷却方法。从烧瓶中取出样本后，使用移动显微镜测量所有组标本上三个预定点之间的线性尺寸变化。采用单因素方差分析和非配对t检验进行统计分析。
线性尺寸变化在骤冷中最大，其次分别是空气冷却和水浴冷却方法。在材料中，PYRAX的线性尺寸变化比DPI丙烯酸树脂更大。
为使义齿基托更好地贴合黏膜，应提倡采用所述的缓慢冷却方法。
