Journal of Prevention and Treatment for Stomatological Diseases ›› 2019, Vol. 27 ›› Issue (4): 246-249.doi: 10.12016/j.issn.2096-1456.2019.04.008

• Prevention and Treatment Practice • Previous Articles     Next Articles

Comparison of the formation ability of two types of machine-made nickel-titanium instruments in simulated curved root canals

LI Tingting,JIANG Wei,PAN Yueping()   

  1. Department of Endodontics, Shanghai Ninth People’Hospital, College of Stomatology, Shanghai Jiao Tong University School of Medicine, National Clinical Research Center for Oral Diseases, Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology,Shanghai 200011, China
  • Received:2018-10-30 Revised:2018-11-15 Online:2019-04-20 Published:2019-04-28
  • Contact: Yueping PAN E-mail:zrx61@sina.com

Abstract:

Objective To compare ProTaper Universal (PU) and M3-L instruments in preparing curved root canals and to provide a reference for clinical applications.Methods Twenty resin-simulated curved single root canals were randomly divided into two groups. Root canal preparation was performed with a PU nickel-titanium file or an M3-L nickel-titanium file. Root canal preparation time, root canal length before and after preparation and root canal deviation were recorded.Results In the M3-L group, the displacement measured at the 4th to 7th sites was less than that in the PU group (P < 0.05), but there was no significant difference between the other two groups (P > 0.05); The length of the root canal before and after root canal preparation in the M3-L group was (14.90 ± 1.92)mm and (14.57 ± 1.13)mm, respectively, and the difference between the two groups was not statistically significant (t=3.18, P=0.058). The root canal length before and after root canal preparation in the PU group was(14.53 ± 1.53)mm and (14.28 ± 1.39)mm, respectively. The difference between the two groups was not statistically significant(t=2.12,P=0.124); The average preparation time of the M3-L group [(110.15 ± 10.43)s] was less than that in the PU group [(330.48 ± 12.62)s] (P < 0.05).Conclusion The M3-L nickel-titanium file has better central positioning ability and is less time-consuming than the PU nickel-titanium file in root canal bending preparation.

Key words: Root canal preparation, Central positioning ability, Nitinol, ProTaper Universal, M3-L

CLC Number: 

  • R781.05

Figure 1

Photographs taken before and after root canal preparation"

Figure 2

Schematic diagram of the internal and external root canal removal measurements"

Table 1

The absolute value of the difference between the removal amounts of the 2 instruments n=10, mm, $\bar{x}$± s"

测量点距根尖孔的距离(mm) PU M3-L t P
1 0.04 ± 0.03 0.05 ± 0.03 1.876 0.348
2 0.06 ± 0.05 0.06 ± 0.04 1.199 0.779
3 0.05 ± 0.03 0.04 ± 0.03 2.121 0.208
4 0.12 ± 0.06 0.09 ± 0.07 4.132 0.032
5 0.16 ± 0.07 0.09 ± 0.06 5.012 0.012
6 0.13 ± 0.10 0.09 ± 0.09 4.281 0.024
7 0.12 ± 0.14 0.08 ± 0.08 3.876 0.045
8 0.15 ± 0.16 0.13 ± 0.11 1.419 0.523
9 0.13 ± 0.25 0.12 ± 0.11 1.815 0.448
10 0.14 ± 0.23 0.12 ± 0.09 2.463 0.125
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