Webb E L, Murray H V, Holland G A, Taylor D F
J Prosthet Dent. 1983 Jun;49(6):777-80. doi: 10.1016/0022-3913(83)90347-5.
Machined steel dies were used to study the effects of three die modifications on seating full coverage castings during cementation. The die modifications consisted of occlusal channels, occlusal surface relief, and axial channels. Fourteen specimens having one or more forms of die modification were compared with two control specimens having no die modifications. Statistical analysis of the data revealed that the addition of four axial channels to the simulated preparation on the steel die produced a significant reduction in the mean marginal discrepancy during cementation. Occlusal modifications alone failed to produce significant reductions in marginal discrepancies when compared with the control specimens. Occlusal modifications in conjunction with axial channels failed to produce further significant reductions in marginal discrepancies when compared with those reductions observed in specimens having only axial channels.
使用加工过的钢模来研究三种模具改进措施对粘结全冠铸件就位的影响。模具改进措施包括咬合沟、咬合面减压和轴沟。将14个具有一种或多种模具改进形式的样本与2个未进行模具改进的对照样本进行比较。数据的统计分析表明，在钢模上的模拟预备体上增加四条轴沟，在粘结过程中平均边缘差异显著减小。与对照样本相比，单独的咬合改进措施未能显著减小边缘差异。与仅具有轴沟的样本相比，咬合改进措施与轴沟相结合并未进一步显著减小边缘差异。
