Journal of the Formosan Medical Association
Volume 107, Issue 5 , Pages 381-388, May 2008

Endodontic Shaping Performance Using Nickel–Titanium Hand and Motor ProTaper Systems by Novice Dental Students

  • Ming-Gene Tu

      Affiliations

    • Faculty of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
    • School of Dentistry, China Medical University, Taichung, Taiwan
    • Department of Dentistry, China Medical University and Hospital, Taichung, Taiwan
    • ,
  • San-Yue Chen

      Affiliations

    • School of Dentistry, China Medical University, Taichung, Taiwan
    • ,
  • Heng-Li Huang

      Affiliations

    • School of Dentistry, China Medical University, Taichung, Taiwan
    • ,
  • Chi-Cheng Tsai

      Affiliations

    • Faculty of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
    • Corresponding Author InformationCorrespondence to: Professor Chi-Cheng Tsai, Faculty of Dentistry, College of Dental Medicine, Kaohsiung Medical University, Shih-Chuan 1st Road, Kaohsiung 807, Taiwan

Received 23 October 2007; received in revised form 18 January 2008; accepted 12 February 2008.

Article Outline

Background/Purpose

Preparing a continuous tapering conical shape and maintaining the original shape of a canal are obligatory in root canal preparation. The purpose of this study was to compare the shaping performance in simulated curved canal resin blocks of the same novice dental students using hand-prepared and engine-driven nickel–titanium (NiTi) rotary ProTaper instruments in an endodontic laboratory class.

Methods

Twenty-three fourth-year dental students attending China Medical University Dental School prepared 46 simulated curved canals in resin blocks with two types of NiTi rotary systems: hand and motor ProTaper files. Composite images were prepared for estimation. Material removed, canal width and canal deviation were measured at five levels in the apical 4 mm of the simulated curved canals using AutoCAD 2004 software. Data were analyzed using Wilcoxon's rank-sum test.

Results

The hand ProTaper group cut significantly wider than the motor rotary ProTaper group in the outer wall, except for the apical 0 mm point. The total canal width was cut significantly larger in the hand group than in the motor group. There was no significant difference between the two groups in centering canal shape, except at the 3 mm level.

Conclusion

These findings show that the novice students prepared the simulated curved canal that deviated more outwardly from apical 1 mm to 4 mm using the hand ProTaper. The ability to maintain the original curvature was better in the motor rotary ProTaper group than in the hand ProTaper group. Undergraduate students, if following the preparation sequence carefully, could successfully perform canal shaping by motor ProTaper files and achieve better root canal geometry than by using hand ProTaper files within the same teaching and practicing sessions.

Key Words:  canal deviations , endodontic curriculum , endodontic shaping performance , NiTi hand and motor ProTaper , simulated curved canals

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PII: S0929-6646(08)60103-5

doi:10.1016/S0929-6646(08)60103-5

Journal of the Formosan Medical Association
Volume 107, Issue 5 , Pages 381-388, May 2008

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