Shaping ability of rotary nickel-titanium Mtwo versus K3 in severely curved root canals

doi:10.3969/j.issn.2095-4344.2015.12.005

Abstract

Abstract:

BACKGROUND: Severely curved root canal preparation is the difficulty during clinical root canal preparation, and improper preparation may induce complications such as stage, root canal offset and apical open, which affect the quality of root canal preparation and apical closure. Therefore, it is important to choose a root canal preparation instrument which has the best cutting and forming ability.
OBJECTIVE: To compare the shaping ability of Mtwo nickel-titanium rotary instruments, K3 nickel-titanium rotary instruments and stainless steel K-files for the preparation of curved root canals.
METHODS: A total of 30 severely curved root canals of freshly extracted human maxillary molars were randomly divided into three groups, with 10 canals in each group. The canals were prepared by Mtwo instruments, K3 instruments and K-files, respectively. The instrument’s tip location in pre- and post-instrumentation radiographs of the three groups was recorded; the changes of root curvature, working length and working time in the three groups were measured and compared.
RESULTS AND CONCLUSION: The root curvature showed no significant difference in the three groups before preparation (P > 0.05). The changes of root curvature after root preparation in Mtwo instrument and K3 instrument groups were significantly less than that in K-files group (P < 0.01), and no significant difference was found between Mtwo instrument group and K3 instrument group (P > 0.05). The root canal preparation time in the three groups showed significant differences (P < 0.01), which was the shortest in Mtwo instrument group and the longest in K-files group. The changes of working length after root preparation in the three groups showed no significant difference (P > 0.05). Mtwo nickel-titanium rotary instruments and K3 nickel-titanium rotary instruments are have high efficacy and strong shaping ability in preparing curved root canals.

中国组织工程研究杂志出版内容重点：生物材料；骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性；组织工程

全文链接：

Key words: Tissue Engineering, Root Canal Preparation, Dental Instruments

CLC Number:

R318

Wang Li-na, Liu Qi-cheng, Fu Kang-gui, Shi Chun, Niu Wei-dong. Shaping ability of rotary nickel-titanium Mtwo versus K3 in severely curved root canals[J]. Chinese Journal of Tissue Engineering Research, 2015, 19(12): 1827-1831.

Figures/Tables 1

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