Determination of the accuracy of three die systems.
Determination of the accuracy of three die systems.
复制标题
确定三个模具系统的精度。
DOI：
10.1016/s0022-3913(05)80007-1
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Lang,BR
中科院分区：
文献类型：
--
作者：
Bloem,TJ;Czerniawski,B;Luke,J;Lang,BR
本文报告了两个相互关联的项目的研究结果，这两个项目使用密歇根计算机图形坐标测量系统 (MCGCMS) 测量电镀、环氧树脂和聚氨酯模具材料相对主齿的精度。在第一阶段，在咬合模具形态上，使用母牙的复制品来验证 MCGCMS 的可靠性。然后将来自三个镀银模具和三个环氧树脂模具的十八个总数据集与主牙的代表性数据集进行比较。所有镀银芯片和环氧树脂芯片测量值与母版的平均差异分别为 -42 至 -49 和 -46 至 -230μm/mm2。在第二阶段，以相同的方式将两种环氧模具材料和聚氨酯系统与主齿进行比较。在与母牙的配对比较中，环氧树脂材料、环氧树脂和聚氨酯模具的平均差异范围分别为-147至-153、-149至-230和-56至-168μm/mm2。在主齿和五个模具系统之间进行了使用 CLR 方差分析的学生测试。在 95% 置信水平下，搪瓷-银差异和搪瓷-环氧树脂差异数据之间存在显着差异。搪瓷银和搪瓷环氧树脂之间也存在显着差异。结论是镀银模具是可接受的母牙复制品。与镀银模具相比，环氧树脂和环氧树脂模具无法提供可靠的复制。环氧树脂和聚氨酯复制品虽然报告准确，但尚无定论。
This article reports the findings of two interrelated projects that measured the accuracy of electroplated, epoxy resin, and polyurethane die materials against a master tooth, using the Michigan Computer Graphics Coordinate Measuring System (MCGCMS). In the first phase, on occlusal die morphology, replications of a master tooth were used to validate the MCGCMS reliability. Eighteen total data sets derived from three silver-plated dies and three epoxy resin dies were then compared with a representative data set of the master tooth. The mean differences for all silver-plated die and epoxy die measurements against the master ranged from −42 to −49 and −46 to −230μm/mm2, respectively. In the second phase, two epoxy die materials and a polyurethane system were compared with a master tooth in an identical manner. In paired comparisons to the master tooth, mean differences for Epoxydent material, epoxy resin, and polyurethane dies ranged from −147 to −153, −149 to −230, and −56 to −168μm/mm2, respectively. A Studentttest using a CLR ANOVA was performed between the master tooth and the five die systems. A significant difference was revealed between the enamel-silver difference and the enamel-Epoxydent difference data at the 95% confidence level. A significant difference also occurred between enamel-silver and enamel-epoxy resin. It was concluded that silver-plated dies are acceptable replicas of a master tooth. Epoxydent and epoxy resin dies did not provide reliable replications when compared with the silver-plated dies. Epoxy and polyurethane replications, although reported as accurate, were inconclusive.