Passon C, Lambert R H, Lambert R L, Newman S
University of Colorado School of Dentistry.
Oper Dent. 1992 Mar-Apr;17(2):42-9.
The application of die-spacer to crown preparation dies prior to the fabrication of the cast crown is an acceptable procedure to improve the fit of the restoration. Previous studies have shown that the retention of the restoration will be improved, unchanged, or reduced when an appropriate thickness of die-spacer is used. No studies have determined the effect on retention if excessive die-spacer is used. This study evaluated the effect of increasing die-spacer thickness on the retention of cast full crowns. Cast copings were fabricated on dies coated with either 0, 4, 8, 12, or 16 coats of die-spacer, cemented on the respective teeth, and removed using an Instron Universal Testing Machine. There were no statistically significant differences (P < or = 0.05) between the mean force required to remove the cemented copings. It appears that increasing the application of die-spacer up to 16 coats (151 micrometers) does not adversely affect the retention of cemented cast copings.
在铸造全冠制作之前，在牙冠预备体代型上应用代型间隙剂是一种可接受的提高修复体适合性的方法。先前的研究表明，使用适当厚度的代型间隙剂时，修复体的固位力会得到提高、保持不变或降低。尚无研究确定使用过量代型间隙剂对固位力的影响。本研究评估了增加代型间隙剂厚度对铸造全冠固位力的影响。在涂有0、4、8、12或16层代型间隙剂的代型上制作铸造内冠，将其粘结在相应牙齿上，然后使用英斯特朗万能材料试验机将其移除。移除粘结内冠所需的平均力之间无统计学显著差异（P≤0.05）。看来增加代型间隙剂的涂抹层数至16层（151微米）不会对粘结铸造内冠的固位力产生不利影响。
