Sonntag David, Ott Mareike, Kook Kathrin, Stachniss Vitus
Department of Operative Dentistry, Philipps-University Marburg, Georg-Voigt-Strasse 3, 35033 Marburg, Germany.
Aust Endod J. 2007 Aug;33(2):73-81. doi: 10.1111/j.1747-4477.2007.00062.x.
The aim of this paper was to examine the result of rotary root canal preparation with the nickel-titanium (NiTi) systems K3, ProTaper and Mtwo. One hundred and fifty curved artificial root canals and 60 mesial canals of human mandibular molars were selected. In the group of curved artificial canals, all canals were prepared to size 35/0.04 taper with the three systems. In the group of human mandibular molars, the teeth with mature root canals were radiographed with silver points inserted in bucco-lingual and in mesio-distal positions. In the artificial root group, one K3 instrument separated. Mtwo (20%) showed significantly (P = 0.003) less zips than K3 (46.9%) or ProTaper (50%). There were no significant differences in ledge and elbow formation. K3 and Mtwo had the lowest percentage of canal transportation. There was no significant difference regarding the preparation length or the condition of the apical foramina following the preparation. Canals prepared with K3 (26.5%) were significantly (P < 0.001) less tapered than ProTaper (62%) and Mtwo (82%). In the human mandibular molar group, one Mtwo and one ProTaper instrument separated. No significant differences were found in the preparation length, transportation or taper. The three systems tested, K3, Mtwo and ProTaper, achieved good preparation results.
本文旨在研究使用镍钛（NiTi）系统K3、ProTaper和Mtwo进行旋转根管预备的结果。选取了150个弯曲的人工根管和60颗人类下颌磨牙的近中根管。在弯曲人工根管组中，使用这三种系统将所有根管预备至35/0.04锥度。在人类下颌磨牙组中，对根管成熟的牙齿插入银尖，分别在颊舌向和近远中向进行X线摄片。在人工根管组中，有1根K3器械分离。Mtwo（20%）出现的拉链状痕迹显著（P = 0.003）少于K3（46.9%）或ProTaper（50%）。在台阶和肘状弯曲形成方面无显著差异。K3和Mtwo的根管偏移率最低。预备后的长度或根尖孔情况无显著差异。用K3预备的根管（26.5%）的锥度显著（P < 0.001）小于ProTaper（62%）和Mtwo（82%）。在人类下颌磨牙组中，有1根Mtwo和1根ProTaper器械分离。在预备长度、偏移或锥度方面未发现显著差异。所测试的三种系统，K3、Mtwo和ProTaper，均取得了良好的预备效果。
