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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5mm,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。
Objective To investigate the effect of immediate and delayed post-canal preparation on apical microleakage after different lengths of root canal filling. Methods From September 2011 to July 2012, 120 teeth of single root canal root canal extraction from maxillofacial surgery in Shenyang Stomatological Hospital were randomly divided into two groups (A and B), 60 teeth in each group. A group of root canal filling root canal area 5mm, B group full-length root canal filling. A and B groups were divided into three subgroups, namely A1 ~ A3, B1 ~ B3, 20 teeth in each subgroup. Group A1 and Group B1 were prepared immediately after root canal filling; group A2 and group B2 were filled with root canal one week later; and group A3 and group B3 were not prepared after root canal filling. Each group of samples were stained with Indian ink, and the apical staining length was determined under a stereomicroscope after the transparent treatment to evaluate the microleakage. Results There was no significant difference in staining length between group A1 and group B1, group A2 and group B2, group A3 and group B3 (P> 0.05). There was no significant difference in the staining length between group A1 and group A3, group B1 and group B3 (P> 0.05), but there was a significant difference between group A2 and group B2 (P <0.05). Conclusion Partial root canal filling compared with total root canal filling has no effect on apical microleakage. Delayed post-canal preparation aggravates apical microleakage compared with immediate post-canal preparation.