Hosoya N, Nomura M, Yoshikubo A, Arai T, Nakamura J, Cox C F
Department of Periodontics and Endodontics, Tsurumi University School of Dental Medicine, 2-1-3 Tsurumi, Tsurumi-ku, Yokohama 230-8501, Japan.
J Endod. 2000 May;26(5):292-4. doi: 10.1097/00004770-200005000-00011.
The purpose of this study was to observe the seal obtained in human root canals under different in vitro treatment conditions. Root canals of freshly extracted human maxillary incisors received traditional biomechanical preparation and irrigation with 10% NaClO, followed by a final rinse of distilled water. Teeth were divided into four groups. In group 1, each root canal was dried with one paper point. In group 2, each root canal was dried with four paper points. Group 3 was dried with four paper points, followed by a gentle burst of warm air. Group 4 was dried using four paper points, followed by an internal 200 degrees C heat probe. Twenty canals in each group were filled with a gutta-percha cone and a zinc oxide-eugenol sealer, whereas 20 were filled with a glass ionomer sealer. All teeth were immediately immersed in India ink for 1 or 4 wk. The teeth were cleared, and the dye penetration-leakage measured with an accuracy of +/- 0.01 mm. Optimum sealing conditions were observed when the canal was dried with paper points and a 200 degrees C probe. There were no significant differences between 1 and 4 wk immersion. Glass ionomer sealer appeared more susceptible to the wet condition of the root canal walls than zinc oxide-eugenol sealer. An additional 40 teeth were prepared in the same manner as the dye penetration tests to observe the drying conditions of the root canal walls, and the moisture inside the canals was measured to an accuracy of 0.0001 g. The highest degree of internal canal wall dryness was found in group 4.
本研究的目的是观察在不同体外处理条件下人类根管内获得的封闭效果。新鲜拔除的人类上颌切牙的根管接受传统的生物力学预备并用10%次氯酸钠冲洗，随后用蒸馏水进行最终冲洗。牙齿被分为四组。在第1组中，每个根管用一个纸尖干燥。在第2组中，每个根管用四个纸尖干燥。第3组先用四个纸尖干燥，然后用一阵温暖的空气轻柔吹干。第4组先用四个纸尖干燥，然后用一个200℃的内热探针干燥。每组中的20个根管用牙胶尖和氧化锌丁香酚封闭剂充填，而另外20个用玻璃离子封闭剂充填。所有牙齿立即浸入印度墨水中1周或4周。牙齿经过清理，染料渗透-微渗漏的测量精度为±0.01毫米。当根管用纸尖和200℃的探针干燥时观察到最佳的封闭条件。1周和4周浸泡之间没有显著差异。与氧化锌丁香酚封闭剂相比，玻璃离子封闭剂似乎更容易受到根管壁潮湿状况的影响。另外40颗牙齿按照与染料渗透试验相同的方式进行预备，以观察根管壁的干燥情况，并测量根管内的水分，测量精度为0.0001克。在第4组中发现根管内壁的干燥程度最高。
