Horvath S D, Altenburger M J, Naumann M, Wolkewitz M, Schirrmeister J F
Department of Prosthodontics, University School and Dental Hospital, University of Freiburg, Freiburg, Germany.
Int Endod J. 2009 Nov;42(11):1032-8. doi: 10.1111/j.1365-2591.2009.01616.x.
To determine the influence of solvents on gutta-percha and sealer remaining on root canal walls and in dentinal tubules.
The root canals of 70 teeth were prepared chemomechanically to apical size 40. In group 1 (n = 10; control group), the canals remained unfilled. In groups 2-4 (n = 20 each), the canals were filled using lateral compaction with gutta-percha and sealer. Removal of root fillings was undertaken after 2 weeks using Gates Glidden burs and hand files without solvent (group 2), with eucalyptol (60 microL; group 3) and with chloroform (60 microL; group 4) to size 50. After further irrigation using sodium hypochlorite and ethylenediaminetetraacetic acid, the roots were split, photographed and scanning electron microscopy (SEM) was performed. The number of filled dentinal tubules (SEM) and the surface covered by root filling remnants (photographs) were evaluated for the coronal, middle and apical third of each root half. Statistical analysis was performed via mixed model for clustered data followed by Tukey's test.
After pooling the results of all thirds of the canal, open tubules were more prevalent in the control group, followed by the nonsolvent group, the eucalyptol group and the chloroform group (P < 0.05 between all groups). Less surface was covered by root filling remnants in the nonsolvent group than in the eucalyptol group and the chloroform group (P < 0.05); again, fewer remnants were found in the control group than in all other groups (P < 0.05).
Solvents led to more gutta-percha and sealer remnants on root canal walls and inside dentinal tubules.
确定溶剂对残留在根管壁和牙本质小管内的牙胶和封闭剂的影响。
对70颗牙齿的根管进行化学机械预备至根尖尺寸40。第1组（n = 10；对照组），根管未充填。第2 - 4组（每组n = 20），采用侧向加压法用牙胶和封闭剂充填根管。2周后，使用盖茨·格利登钻和手动锉去除根管充填物，第2组不使用溶剂，第3组使用桉叶油（60微升），第4组使用氯仿（60微升），预备至尺寸50。在进一步用次氯酸钠和乙二胺四乙酸冲洗后，将牙根劈开、拍照并进行扫描电子显微镜（SEM）检查。对每个牙根半侧的冠部、中部和根尖三分之一评估充填的牙本质小管数量（SEM）和被根管充填物残余覆盖的面积（照片）。通过聚类数据混合模型进行统计分析，随后进行Tukey检验。
汇总根管所有三分之一的结果后，开放小管在对照组中更为普遍，其次是无溶剂组、桉叶油组和氯仿组（所有组之间P < 0.05）。无溶剂组被根管充填物残余覆盖的面积小于桉叶油组和氯仿组（P < 0.05）；同样，对照组中发现的残余物少于所有其他组（P < 0.05）。
溶剂导致根管壁和牙本质小管内残留更多的牙胶和封闭剂。
