即刻和延迟的根管桩道预备对不同封闭剂和技术封闭根管根尖的影响。
Effect of immediate and delayed post space preparation on the apical seal of root canals obturated with different sealers and techniques.
机构信息
Department of Endodontics, Ondokuz Mayis University, Samsun, Turkey.
出版信息
J Appl Oral Sci. 2009 Nov-Dec;17(6):605-10. doi: 10.1590/s1678-77572009000600013.
UNLABELLED
During mechanical preparation of the post space, the root canal filling may be twisted or vibrated, depending on several factors associated with the preparation technique and quality of filling.
OBJECTIVE
The purpose of this study was to investigate the effect of immediate and delayed post space preparation on the integrity of the apical seal.
MATERIAL AND METHODS
Sixty-four extracted human incisors were biomechanically prepared using the step-back technique. Sixty roots were randomly assigned to 6 experimental groups of 10 teeth each and the remaining 4 roots served as positive and negative controls (n=2). The root canals in the different groups were obturated with cold lateral and warm vertical condensation of gutta-percha and one of two sealers (Sealapex and Diaket). Post space was prepared either individually or simultaneously. An insulated copper wire was cut into 10-cm-long pieces. In each canal, one piece was inserted to maintain contact with gutta-percha and extended to the outside as one of two working electrodes. A stainless steel wire with the same dimensions of those of the copper wire, used as the other working electrode, was immersed into the background electrolyte from the center of the bottle. The electrical current between standard and experimental electrodes in canals was measured over a period of 10 days applying a conductivity meter. The Kruskal-Wallis test (p=0.05) determined whether there was a significant difference in microleakage among the groups and the Mann-Whitney U test (p=0.01) was used for multiple comparison grouping variables.
RESULTS
The results suggest that only the differences between the root canal filling techniques were statistically significant (p<0.01). There were no statistically significant difference in the sealers and the times of filling removal for post space preparation (p>0.01).
CONCLUSION
The quality of the root canal filling is important for the integrity of the apical seal.
目的
本研究旨在探讨即刻和延迟后牙根管预备对根尖封闭完整性的影响。
材料和方法
64 颗人离体前磨牙采用逐步后退法进行根管预备。60 根随机分为 6 个实验组，每组 10 根，其余 4 根作为阳性和阴性对照（n=2）。不同组的根管用冷侧向和热垂直冷凝牙胶和两种密封剂（Sealapex 和 Diaket）进行填充。后牙根管预备单独或同时进行。将绝缘铜丝切成 10cm 长的小段。在每个根管中，插入一段与牙胶保持接触，并延伸至外部作为两个工作电极之一。与铜丝尺寸相同的不锈钢丝作为另一个工作电极，浸入瓶中心的背景电解液中。在 10 天的时间内，用电导率计测量标准电极和实验电极之间的电流。Kruskal-Wallis 检验（p=0.05）确定组间微渗漏是否存在显著差异，Mann-Whitney U 检验（p=0.01）用于对分组变量进行多重比较。
结果
结果表明，只有根管填充技术之间的差异具有统计学意义（p<0.01）。密封剂和后牙根管预备去除牙胶的时间之间没有统计学差异（p>0.01）。
结论
根管填充质量对根尖封闭完整性很重要。
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