iRoot SP���ڵ���������������ʵ���о�

目的评价根管封闭剂iRootSP的根尖封闭效果。方法选择2012年9—12月中国医科大学口腔医学院口腔外科拔除的单根管前牙50颗，随机分为2个实验组（A、B组，每组20颗）和2个对照组（c组为阳性对照组，D组为阴性对照组，每组5颗）。所有牙均常规开髓、拔髓，采用机用ProTaper设备根管至F2。A、B组分别采用根管封闭剂iRootSP加单尖充填技术和根管封闭剂AHPlus加单尖充填技术充填根管，c、D组均不做任何根管充填；4组牙齿均用光固化复合树脂充填髓腔及开髓孔。A、B、c组在除根尖孔2mm外的整个牙根表面均匀涂布指甲油2遍，D组在牙根表面及根尖孔全部涂布指甲油2遍。采用染料渗透法检测根尖微渗漏情况，对各组染料渗透长度进行比较分析。结果A、B组均有不同程度的根尖微渗漏，A组染料渗透长度为（1．62±0．20）mm，B组为（1．80±0．20）mm，两组间差异无统计学意义（P〉0．05）。作为阳性对照的c组，染料渗透长度为（10．75±1．28）mm，几乎渗入牙根全长；作为阴性对照的D组，则无染料渗入牙根。结论根管封闭剂iRootSP的根尖封闭性能与AHPlus相似。由于单尖充填技术操作简便，副损伤小，省时省力，具有良好的临床应用前景。

Study on apical sealing ability of iRoot SP root canal sealer with single-cone obtruation technique

Objective To evaluate the apical sealing ability of iRoot SP root canal sealer with single-cone obtruation technique. Methods Fifty recently extracted human anterior teeth with a single canal were divided randomly into two experiment groups （twenty teeth in each group）, and positive and negative control group （five teeth in each group）. The root canals were instrumented using ProTaper file to F2, and were obturated with iRoot SP with single-cone obtruation technique （group A）, AH plus with single-cone obtruation technique （group B）. The apical microleakage was evaluated by dye penetration method. Linear dye penetration was measured and analyzed by means of SPSS13.0 software package. Results Mean depth of leakage for groups with the smear layer inact was （ 1.62± 0.20）ram for group A, （ 1.80± 0.20） mm for group B, （10.75 ± 1.28）mm for positive control group, and 0 mm for negative group. The value of the experimen tal group B was greater than group A, but there was no significant difference between two groups. Conclusion iRoot SP shows similar in vitro apical sealing ability to AH plus. The clinical application is promising.