Iriboz Emre, Sazak Öveçoğlu Hesna
Department of Endodontics, Marmara University Faculty of Dentistry, İstanbul, Turkey.
Aust Endod J. 2014 Apr;40(1):6-11. doi: 10.1111/aej.12011. Epub 2012 Dec 11.
To evaluate the effectiveness of the ProTaper and Mtwo retreatment systems for removal of resin-based obturation techniques during retreatment. A total of 160 maxillary anterior teeth were enlarged to size 30 using ProTaper and Mtwo rotary instruments. Teeth were randomly divided into eight groups. Resilon + Epiphany, gutta-percha + Epiphany, gutta-percha + AH Plus and gutta-percha + Kerr Pulp Canal Sealer (PCS) combinations were used for obturation. ProTaper and Mtwo retreatment files were used for removal of root canal treatments. After clearing the roots, the teeth were split vertically into halves, and the cleanliness of the canal walls was determined by scanning electron microscopy. Specimens obturated with gutta-percha and Kerr PCS displayed significantly more remnant obturation material than did specimens filled with resin-based obturation materials. Teeth prepared with Mtwo instruments contained significantly more remnant filling material than did teeth prepared with ProTaper. ProTaper files were significantly faster than Mtwo instruments in terms of the mean time of retreatment and time required to reach working length. The Resilon + Epiphany and AH Plus + gutta-percha obturation materials were removed more easily than were the Epiphany + gutta-percha and Kerr PCS + gutta-percha obturation materials. Although ProTaper retreatment files worked faster than did Mtwo retreatment files in terms of removing root canal obturation materials, both retreatment systems are effective, reliable and fast.
评估ProTaper和Mtwo再治疗系统在再治疗过程中去除树脂类根管充填材料的效果。使用ProTaper和Mtwo旋转器械将160颗上颌前牙扩大至30号。将牙齿随机分为八组。采用Resilon+Epiphany、牙胶尖+Epiphany、牙胶尖+AH Plus和牙胶尖+Kerr牙髓根管封闭剂（PCS）组合进行根管充填。使用ProTaper和Mtwo再治疗锉去除根管充填物。清理根管后，将牙齿垂直劈成两半，通过扫描电子显微镜确定根管壁的清洁度。与使用树脂类充填材料的标本相比，用牙胶尖和Kerr PCS充填的标本显示出更多的残余充填材料。用Mtwo器械预备的牙齿比用ProTaper预备的牙齿含有更多的残余充填材料。就再治疗平均时间和达到工作长度所需时间而言，ProTaper锉比Mtwo器械明显更快。与Epiphany+牙胶尖和Kerr PCS+牙胶尖充填材料相比，Resilon+Epiphany和AH Plus+牙胶尖充填材料更容易被去除。尽管在去除根管充填材料方面ProTaper再治疗锉比Mtwo再治疗锉工作得更快，但两种再治疗系统都是有效、可靠且快速的。
