Journal of Prevention and Treatment for Stomatological Diseases ›› 2017, Vol. 25 ›› Issue (7): 426-429.doi: 10.12016/j.issn.2096-1456.2017.07.004

• Basic Study • Previous Articles     Next Articles

In vitro evaluation of retreatment efficacy of Mtwo rotary instruments

Fangli TONG1(), Qin YANG2, Xiongqun ZENG1   

  1. 1. Department of Endodontics, Stomatological Hospital, Southern Medical University, Guangzhou 510280, China
    2. Haizhu Branch, Stomatological Hospital, Southern Medical University, Guangzhou 510280, China
  • Received:2017-01-26 Revised:2017-03-24 Online:2017-07-20 Published:2018-09-03

Abstract:

Objective To evaluate the efficacy of Mtwo rotary instruments during root canal retreatment. Methods Thirty mandibular premolars with oval root canal were prepared with ProTaper rotary instruments and obturated with lateral condensation method. The samples were divided into 2 groups. In Mtwo group, the filling materials were removed with Mtwo retreatment system and Mtwo basic instruments. Inmanual stainless group, the filling material were removed with manual instruments. The percentage of residual filling material was measured with image proplus software and the operating time was recorded. Results The percentage of residual filling material in Mtwo group was significantly lower than manual group in middle third, but the opposite result can be found in the coronal third. In the whole canal, no significant difference was found between the two groups. The mean operating time in Mtwo group was significantly shorter than manual group. Conclusion Mtwo rotary instruments can shorten the time of retreatment, neither of the groups can remove the filling material in oval root canal completely.

Key words: Mtwo rotary instruments, Manual instruments, Root canal preparation, Root canal filling, Root canal retreatment

CLC Number: 

  • R781.05

Figure 1

The modified experimental Maggiore model"

Table 1

The percentage of residual filling material in two groups x?± s,%"

组别 牙数 冠1/3 中1/3 尖1/3 整个根管内
Mtwo镍钛组 15 0.09 ± 0.04 0.10 ± 0.05 0.24 ± 0.09 0.39 ± 0.12
手用器械组 15 0.04 ± 0.02 0.20 ± 0.08 0.21 ± 0.08 0.41 ± 0.13

Figure 2

The RVG image of gutta-percha removal in Mtwo group"

Figure 3

The RVG image of gutta-percha removal in manual group"

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