Baker P S, Oguntebi B R
University of Florida College of Dentistry, Gainesville.
J Endod. 1990 May;16(5):227-9. doi: 10.1016/S0099-2399(06)81676-6.
This in vitro dye leakage study examined the influence of apical root resection and reverse amalgam fillings on the apical seal of root canals obturated with Thermafil. Fifty human canine teeth were instrumented and obturated with either laterally condensed gutta-percha or Thermafil using Roth's zinc oxide-eugenol Type I regular sealer. After 24 h, one of the following additional procedures was performed on 30 of the teeth: 2-mm apical resection, 4-mm apical resection, and 2-mm apical resection plus reverse amalgam filling 2 mm in depth and diameter. The external root surfaces were coated with enamel paint and the teeth were exposed to 1% methylene blue dye at 37 degrees C for 2 wk. The roots were split longitudinally and the depth of linear dye penetration was measured through a stereozoom microscope. Statistical analysis showed no significant differences in the linear dye penetration among the various groups of teeth.
这项体外染料渗漏研究考察了根尖牙根切除术和倒充汞合金充填对用Thermafil充填的根管根尖封闭性的影响。五十颗人犬齿进行了预备，并用侧向加压牙胶或Thermafil，使用Roth氏I型常规氧化锌丁香油封闭剂进行充填。24小时后，对30颗牙齿进行了以下额外操作之一：2毫米根尖切除术、4毫米根尖切除术、2毫米根尖切除术加深度和直径均为2毫米的倒充汞合金充填。牙根外表面涂有釉质漆，牙齿在37℃下暴露于1%亚甲蓝染料中2周。将牙根纵向劈开，通过体视显微镜测量线性染料渗透的深度。统计分析表明，不同组牙齿的线性染料渗透没有显著差异。
