Shankar T, Gowd Snigdha, Ahmed Syed Tauqheer, Vinod V, Goud M Vikas, Rao N Venugopal
Department of Prosthodontics, Kalinga Institute of Dental Sciences, Bhubaneswar, Odisha, India.
J Contemp Dent Pract. 2012 Nov 1;13(6):842-9. doi: 10.5005/jp-journals-10024-1240.
The aim of this study is to evaluate the dimensional accuracy of heat polymerized acrylic resin denture base clamped by the conventional method and by new-press technique and cured by long curing cycle.
In this study, a total of 60 standardized maxillary record bases were fabricated with seven reference points as follows: Point A: Incisive papilla, Point B and C: Canine region on either side Point E and G: Midpoint of tuberosities on either side Point F: Midpoint of the line joining the two tuberosities Point D: Midpoint between the line joining A and F.
Ten maxillary record bases were fabricated by conventional clamping method and cured by long curing cycle. GROUP A': Ten maxillary record bases were fabricated by New Press or RS tension clamping method and cured by long curing cycle. The distances between the reference points, i.e. A-B, A-C, A-D, D-F, B-E, C-G, E-F, F-G, B-D, D-G, C-D, D-E of all three thermoplastic denture base plates were measured and recorded with the help of travelling microscope and were used for comparison with the measured and recorded readings of processed acrylic denture bases. The data obtained was analyzed by using the one-way analysis of variance and HSD Multiple Comparison Test.
The overall results of the study indicate that among all the denture bases cured by the two clamping systems and the long curing cycle, group A' were the most dimensionally stable, followed by control group A.
The study concluded that the denture bases fabricated by the New Press method using the long curing cycle would produce the most dimensionally stable denture bases.
本研究旨在评估采用传统方法和新压制技术夹紧并经长周期固化的热聚合丙烯酸树脂义齿基托的尺寸精度。
在本研究中，共制作了60个标准化上颌记录基托，设有以下七个参考点：A点：切牙乳头；B点和C点：两侧尖牙区；E点和G点：两侧结节中点；F点：连接两个结节的线的中点；D点：连接A点和F点的线的中点。
A组：采用传统夹紧方法制作10个上颌记录基托，并经长周期固化。A'组：采用新压制或RS张力夹紧方法制作10个上颌记录基托，并经长周期固化。借助移动显微镜测量并记录所有三种热塑性义齿基托板上参考点之间的距离，即A - B、A - C、A - D、D - F、B - E、C - G、E - F、F - G、B - D、D - G、C - D、D - E，并用于与加工后的丙烯酸义齿基托的测量和记录读数进行比较。对获得的数据采用单因素方差分析和HSD多重比较检验进行分析。
研究的总体结果表明，在通过两种夹紧系统和长周期固化的所有义齿基托中，A'组尺寸最稳定，其次是对照组A。
该研究得出结论，采用长周期固化的新压制方法制作的义齿基托尺寸最稳定。
