Schirrmeister J F, Meyer K M, Hermanns P, Altenburger M J, Wrbas K-T
Department of Operative Dentistry and Periodontology, Albert-Ludwigs-University, Hugstetter Strasse 55, D-79106 Freiburg, Germany.
Int Endod J. 2006 Feb;39(2):150-6. doi: 10.1111/j.1365-2591.2006.01066.x.
To evaluate the effectiveness of hand and rotary instrumentation for removal of vertically compacted Epiphany and gutta-percha during retreatment.
Sixty extracted single-rooted maxillary central incisors were enlarged to size 40 using FlexMaster instruments. The teeth were randomly divided into four groups of 15 specimens each. The canals of two groups were obturated using vertically compacted Epiphany. The others were filled with vertically compacted gutta-percha and AH Plus sealer. One Epiphany group and one gutta-percha group was reinstrumented with Gates Glidden burs and Hedström files. In the other two groups, obturation material was removed using Gates Glidden burs and RaCe rotary instruments. After clearing the roots, the area of remaining obturation material on the root canal wall was measured using a computer image analysis program. Statistical analysis was performed using Repeated Measures Analysis of Variance and anova.
Retreatment of specimens obturated with gutta-percha showed significantly more remaining obturation material than specimens filled with Epiphany (P < 0.05). No difference was found between the removal with Hedström files and with RaCe instruments (P > 0.05). Regarding the mean time of retreatment and time required for reaching the working length, Hedström files were significantly faster than RaCe instruments (P < 0.05). The times did not depend on the kind of obturation material (P > 0.05).
Vertically compacted Epiphany in combination with Epiphany Root Canal Sealant was removed more effectively than gutta-percha and AH Plus sealer. Hedström files were more rapid than RaCe rotary instruments.
评估在再治疗过程中，手动和旋转器械去除垂直加压的Epiphany和牙胶的效果。
使用FlexMaster器械将60颗拔除的单根上颌中切牙扩大到40号。将牙齿随机分为四组，每组15个标本。两组根管使用垂直加压的Epiphany进行充填。其他组用垂直加压的牙胶和AH Plus封闭剂充填。一组Epiphany组和一组牙胶组用Gates Glidden钻和Hedström锉进行再预备。在另外两组中，使用Gates Glidden钻和RaCe旋转器械去除充填材料。清理根管后，使用计算机图像分析程序测量根管壁上剩余充填材料的面积。采用重复测量方差分析和方差分析进行统计分析。
用牙胶充填的标本再治疗后剩余的充填材料明显多于用Epiphany充填的标本（P < 0.05）。Hedström锉和RaCe器械去除充填材料的效果无差异（P > 0.05）。关于再治疗的平均时间和达到工作长度所需的时间，Hedström锉明显比RaCe器械快（P < 0.05）。时间不取决于充填材料的种类（P > 0.05）。
垂直加压的Epiphany与Epiphany根管封闭剂联合使用时，比牙胶和AH Plus封闭剂更有效地被去除。Hedström锉比RaCe旋转器械更快。
