Abstract:

Abstract： Objective To explore the effects of immediate or delayed post space preparation on apical microleakage after root canal obturation of different lengths. Methods Totally 120 extracted human teeth with single root were randomly assigned to 6 groups. The 5mm long apical root was filled after root preparation in group A and the whole root was filled in group B. The post space was prepared either immediately after root canal obturation （groups A1 and B1） or one week later （groups A2 and B2）. For groups A3 and B3， no post space preparation was carried out. Indian ink dye and transparency methods were adopted and the extent of dye penetration was measured under a stereo microscope. Results No statistically significant differences were detected between groups A and B （P > 0.05）. There were no significant differences between groups A1 and A3 or B1 and B3 （P > 0.05）. But there were significant differences between the above groups and groups A2 or B2 respectively （P < 0.05）. Conclusion Different lengths of root filling have similar effects on apical microleakage. Delayed post space preparation leads to more serious apical microleakage than immediate post space preparation.

Key words: post space preparation, root canal obturation, microleakage

摘要：

目的 探讨根管不同长度充填后，即刻与延迟桩道预备对根尖微渗漏的影响。方法 选取2011年9月至2012年7月沈阳市口腔医院颌面外科拔除的直根单根管牙齿120颗，行根管预备后随机分为A、B两组，每组60颗牙齿。A组充填根管的根尖区5 mm，B组充填全长根管。A、B两组再各自分为3个亚组，即A1～A3、B1～B3，每个亚组20颗牙齿。其中A1组及B1组根管充填后即刻行桩道预备；A2组及B2组于根管充填1周后行桩道预备；A3组及B3组根管充填后不预备桩道。用印度墨水对各组样本染色，透明处理后在体视显微镜下测定根尖染色长度，评价微渗漏情况。结果 A1组与B1组，A2组与B2组，A3组与B3组间染色长度差异无统计学意义（P > 0.05）；A1组与A3组，B1组与B3组间染色长度差异无统计学意义（P > 0.05），但分别与A2组及B2组间差异有统计学意义（P < 0.05）。结论 部分根管充填相对全根管充填对根尖微渗漏无影响，延迟桩道预备与即刻桩道预备相比会加重根尖微渗漏。

关键词: 桩道预备, 根管充填, 微渗漏