West China Journal of Stomatology

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Evaluation of the efficiency of different instrumentation for root canal retreatment using Micro-computed tomography

Guo Jing1,2, Yin Kaifeng2,3,  Yang Haibing1,2, Han Xuan1,2, Wang Yan1,2.   

  1. 1. Dept. of Endodontics, School of Stomatology, Shandong University, Jinan 250012, China; 2. Shandong Provincial Key Laboratory of Oral Biomedicine,
    Jinan 250012, China; 3. Dept. of Orthodontics, School of Stomatology, Shandong University, Jinan 250012, China
  • Received:2012-06-25 Revised:2012-06-25 Online:2012-06-01 Published:2012-06-01
  • Contact: Wang Yan,Tel:0531-88382623
  • About author:Guo Jing1(1985—),女,北京人,硕士

Abstract:

Objective To establish the three-dimensional model of human permanent premolars based on Microcomputed tomography(Micro-CT) data, and evaluate the efficiency quantitatively of two different instrumentations for root canal retreatment. Methods Forty extracted permanent premolars for the reason of orthodontic treatment were collected, prepared by using ProTaper Ni-Ti files and filled by cold gutta pertscha lateral condensation technique. The subjects were scanned by Micro-CT. Forty teeth were randomly divided into two groups and retreated by K-Flexo files and ProTaper Universal retreatment system respectively. Then all subjects were scanned again, and the mean percentage of remaining filling materials and the scores of remaining filling materials presented in upper, middle and apical 1/3 of the canal were calculated. Results Mean percentage of the remaining filling materials by K-Flexo files was lower than that by ProTaper Universal retreatment system(P=0.005). The scores demonstrated that K-Flexo files had greater efficiency than ProTaper Universal retreatment system when retreating the apical 1/3 of canal(P<0.05). Conclusion This study shows that both techniques could not remove filling materials completely.012, China)

Key words: Micro-computed tomography, three-dimensional reconstruction, root canal retreatment