Ricci E R, Kessler J R
Advanced Education Program in General Dentistry, Ft. Bragg, NC.
J Endod. 1994 Mar;20(3):123-6. doi: 10.1016/S0099-2399(06)80056-7.
This in vitro study was conducted to determine the effect of post space preparation on teeth obturated with the Thermafil technique, both plastic and metal carriers, and the lateral condensation method. Three groups of 30 teeth each were obturated using the lateral condensation technique and the Thermafil plastic and metal techniques. Post space preparations were accomplished on the obturated groups. All specimens were submerged in India ink under a vacuum for 15 min and then soaked for an additional hour at atmospheric pressure. The teeth were decalcified and cleared to permit visualization and measurement of the extent of dye penetration. There was approximately three times more dye penetration in group 2 (plastic carrier) when compared with group 1 (lateral condensation) and group 3 (metal carrier). This was statistically significant at the 99% confidence level.
本体外研究旨在确定根管预备对采用Thermafil技术（包括塑料和金属载体）以及侧向加压法充填的牙齿的影响。每组30颗牙齿，共三组，分别采用侧向加压技术、Thermafil塑料技术和Thermafil金属技术进行充填。对已充填的各组进行根管预备。所有标本在真空中浸泡于印度墨水中15分钟，然后在常压下再浸泡1小时。牙齿经脱钙和透明处理，以便观察和测量染料渗透的程度。与第1组（侧向加压法）和第3组（金属载体）相比，第2组（塑料载体）的染料渗透量大约多两倍。在99%的置信水平上，这具有统计学意义。
