Abby Abraham, Kumar Ranjith, Shibu Job, Chakravarthy Ramasamy
Department of Prosthodontics, Meenakshi Ammal Dental College, Chennai, India.
Indian J Dent Res. 2011 Mar-Apr;22(2):200-4. doi: 10.4103/0970-9290.84282.
The purpose of this study was to investigate and compare the linear dimensional accuracy of denture bases processed with the conventional heat-polymerization technique and the Rafael and Saide (RS) tension system, taking a multidirectional approach.
Twenty standard edentulous maxillary casts were randomly assigned into two groups. A uniform denture base of 1.5 mm thickness was fabricated in wax and later processed by two methods: Group I acrylic resin flasked with the conventional technique and Group II acrylic resin flasked with the RS tension system. The dimensional accuracy was assessed using traveling microscope.
The linear dimensional changes that occurred between the dentures produced with the new press method and the conventional method were statistically insignificant and ranged from 0.002 to 0.11. The dimensionally stable areas were the canines and the most unstable was the posterior palate.
The results of this study suggest that the maximum linear dimensional change occurs around the molars and palatal segment, with the most stable areas being the canines. There was no significant linear dimensional change of the dentures processed between the conventional and the new press technique.
本研究旨在采用多方向研究方法，调查并比较采用传统热聚合法和拉斐尔与赛德（RS）张力系统加工的义齿基托的线性尺寸精度。
将20个标准无牙上颌模型随机分为两组。用蜡制作厚度为1.5毫米的均匀义齿基托，随后通过两种方法进行加工：第一组采用传统技术将丙烯酸树脂装盒，第二组采用RS张力系统将丙烯酸树脂装盒。使用移动显微镜评估尺寸精度。
采用新压制方法和传统方法制作的义齿之间发生的线性尺寸变化在统计学上无显著差异，范围为0.002至0.11。尺寸稳定的区域是尖牙，最不稳定的是后腭部。
本研究结果表明，最大线性尺寸变化发生在磨牙和腭部区域周围，最稳定的区域是尖牙。传统方法和新压制技术加工的义齿之间的线性尺寸变化不显著。
