Tidswell H E, Saunders E M, Saunders W P
Department of Adult Dental Care, Glasgow Dental Hospital and School, UK.
Int Endod J. 1994 Jul;27(4):208-12. doi: 10.1111/j.1365-2591.1994.tb00255.x.
The effect on coronal leakage of the use of either a single gutta-percha cone or cold lateral condensation of gutta-percha, with a glass ionomer sealer cement was studied. In addition, the effect of the removal of the smear layer was also determined. Eighty-eight single-rooted teeth were prepared chemomechanically using hand files, with the balanced force technique. Lubrication was provided by either Hibiscrub (maintaining the smear layer) or an EDTA-containing paste (to remove the smear layer). Copious irrigation was carried out with 2.2% sodium hypochlorite. The teeth were allocated randomly to four groups of 20 teeth each, the remaining eight teeth served as controls. Two groups of teeth, one with and one without smear layer, were obturated with either a single gutta-percha cone or cold laterally condensed gutta-percha, with Ketac Endo as the sealer. The teeth were stored for 6 weeks, thermocycled, and the extent of coronal leakage determined for each group after immersion in India ink for 90 h. The teeth were demineralized, dehydrated and immersed in methyl salicylate, which rendered them transparent. Linear measurement of maximum dye penetration was recorded. The mean depth (+SD) of leakage for the groups in which the smear layer was left intact was 1.68 mm (+0.38) for the single cone (A1) and 2.29 mm (+1.58) for lateral condensation (B1). When the smear layer was removed the mean depth of leakage for the single cone group (A2) was 2.04 mm (+0.73) and 2.37 mm (+1.70) for the laterally condensed group (B2). There was no significant difference in coronal leakage between the groups (P > 0.05).
研究了使用单根牙胶尖或牙胶冷侧方加压充填，并配合玻璃离子封闭剂对冠部微渗漏的影响。此外，还测定了去除玷污层的效果。使用手用锉采用平衡力技术对88颗单根牙进行化学机械预备。分别使用洗必泰（保留玷污层）或含乙二胺四乙酸的糊剂（去除玷污层）进行润滑。用2.2%的次氯酸钠进行大量冲洗。将牙齿随机分为四组，每组20颗，其余8颗作为对照组。两组牙齿，一组保留玷污层，一组去除玷污层，分别用单根牙胶尖或牙胶冷侧方加压充填，并使用Ketac Endo作为封闭剂。将牙齿储存6周，进行热循环处理，然后将每组牙齿浸泡在印度墨水中90小时后测定冠部微渗漏的程度。将牙齿脱矿、脱水并浸泡在水杨酸甲酯中使其透明。记录染料最大渗透深度的线性测量值。保留玷污层的组中，单根牙胶尖组（A1）的渗漏平均深度（+标准差）为1.68毫米（+0.38），侧方加压充填组（B1）为2.29毫米（+1.58）。去除玷污层后，单根牙胶尖组（A2）的渗漏平均深度为2.04毫米（+0.73），侧方加压充填组（B2）为2.37毫米（+1.70）。各组之间的冠部微渗漏无显著差异（P>0.05）。
