Schirrmeister Jörg F, Wrbas Karl-Thomas, Meyer Katharina M, Altenburger Markus J, Hellwig Elmar
Department of Operative Dentistry and Periodontology Albert-Ludwigs-University of Freiburg, Germany.
J Endod. 2006 May;32(5):469-72. doi: 10.1016/j.joen.2005.10.052.
The purpose of this study was to evaluate the efficiency of FlexMaster, ProTaper, and RaCe rotary instruments compared with Hedström files for removal of gutta-percha during retreatment. Sixty mandibular premolars with one single straight canal were instrumented with K-type files and filled using cold lateral compaction and sealer. The teeth were randomly divided into four groups of 15 specimens each. After repreparation with Gates Glidden burs and the test instruments the specimens were cleared. The area of remaining gutta-percha/sealer on the root canal wall was measured from two directions. The RaCe group showed significantly less residual obturation material than FlexMaster and Hedström group (p < 0.05; closed test procedure). There was no difference between ProTaper and all other instruments (p > 0.05). ProTaper and RaCe instruments required significantly less time for retreatment than FlexMaster and Hedström files (p < 0.05). One RaCe file, two ProTaper, and two FlexMaster instruments separated. RaCe cleaned obturated canals more effectively than hand files and FlexMaster files.
本研究的目的是评估FlexMaster、ProTaper和RaCe旋转器械与Hedström锉在根管再治疗期间去除牙胶的效率。选取60颗具有单一直根管的下颌前磨牙，先用K型锉进行预备，然后采用冷侧方加压和封闭剂进行充填。将牙齿随机分为四组，每组15个样本。用Gates Glidden钻和测试器械再次预备后，对样本进行清理。从两个方向测量根管壁上残留牙胶/封闭剂的面积。RaCe组的残留充填材料明显少于FlexMaster组和Hedström组（p < 0.05；封闭检验程序）。ProTaper组与其他所有器械之间无差异（p > 0.05）。ProTaper和RaCe器械进行再治疗所需的时间明显少于FlexMaster和Hedström锉（p < 0.05）。1根RaCe锉、2根ProTaper锉和2根FlexMaster器械分离。与手动锉和FlexMaster锉相比，RaCe能更有效地清理充填根管。
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