Jow J
Veterans Administration Medical Center, West Los Angeles, Brentwood Division, Calif.
J Prosthet Dent. 1989 Jul;62(1):110-5. doi: 10.1016/0022-3913(89)90054-1.
A basic experiment compared two different alterations (modified postpalatal strap and the "Ristau post-dam") of maxillary casts before flasking and processing with a control (unaltered maxillary casts). This experiment evaluated whether the alterations of the maxillary cast and its subsequent flasking procedures can alter the palatal separation in the postpalatal seal region between the master cast and the simulated denture. Ten trials each were performed for the modified postpalatal strap, the Ristau post-dam, and the unaltered maxillary casts (control). Subsequent to the flasking and processing, measurements were made to evaluate the palatal separation in the postpalatal seal region. After two statistical analyses, improvements (decreased palatal separation) were noted with the use of the modified postpalatal strap (with the mechanical undercuts) technique. In addition, measurements were made to compare results before and after 72 hours of hydration.
一项基础实验比较了在上颌模型包埋和处理之前，两种不同的上颌模型改变方式（改良后腭带和“里斯陶后堤”）与对照组（未改变的上颌模型）。该实验评估了上颌模型的改变及其后续的包埋程序是否会改变主模型与模拟义齿之间后腭封闭区域的腭部间距。对改良后腭带、里斯陶后堤和未改变的上颌模型（对照组）分别进行了十次试验。在包埋和处理之后，进行测量以评估后腭封闭区域的腭部间距。经过两次统计分析，发现使用改良后腭带（带有机械倒凹）技术有改善（腭部间距减小）。此外，还进行了测量以比较水化72小时前后的结果。
