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Shaping ability of rotary or reciprocating systems for oval root canal preparation: a micro-computed tomography study

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Abstract

Objectives

To evaluate the shaping ability and cleaning after oval root canal preparation using one or more instruments in reciprocating or rotary motion.

Materials and methods

Oval-shaped mandibular incisors were selected, based on the radiographic diameter (2 ≤ diameter ratio ≤ 4), and assigned according to root canal preparation (n = 18): single-file (Reciproc R40); two reciprocating files (Unicone size 20 and 40, .06 taper) or Mtwo rotary files until a size 40, .06 taper instrument. Root canal preparations were performed using an open root canal model. Scanning was performed before and after preparation using SkyScan 1176 with a voxel size of 17.42 μm. Volume, percentage of debris, and percentage of uninstrumented surface were analyzed in the entire root canal and in each root canal third. Data were compared using ANOVA and Tukey or Kruskal-Wallis and Dunn tests (α = 5%).

Results

The initial volume were similar among the groups (p > .05). Unicone preparation was associated with higher debris, increase in root canal volume and uninstrumented surface in entire root canal and in the middle third (P < .05). Mtwo was associated with lower uninstrumented surface in the entire root canal and in the cervical third. The apical third were similar for the three preparations.

Conclusions

Unicone system using two instruments in reciprocating motion resulted in higher increase in volume. However, less remaining debris was observed when Reciproc single-file and Mtwo rotary systems were used.

Clinical relevance

A preparation that volumetrically increases the root canal is not necessarily associated with better cleaning. Shaping and hard-tissue debris removal depends on root canal anatomy, kinematics, number of instruments, and instrument design.

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Funding

This study was funded by São Paulo Research Foundation—FAPESP 2015/03437-6.

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Authors and Affiliations

  1. Department of Restorative Dentistry, Araraquara Dental School, UNESP – Univ Estadual Paulista, Araraquara, SP, Brazil

    Camila Galletti Espir, Camila Almeida Nascimento-Mendes, Juliane Maria Guerreiro-Tanomaru & Mário Tanomaru-Filho

  2. Department of Restorative Dentistry, Federal University of Paraná, Curitiba, Paraná, Brazil

    Bruno Cavalini Cavenago

  3. Department of Restorative Dentistry, Endodontics and Dental Materials, School of Dentistry of Bauru, University of São Paulo, Bauru, São Paulo, Brazil

    Marco Antonio Hungaro Duarte

Authors
  1. Camila Galletti Espir
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  2. Camila Almeida Nascimento-Mendes
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  3. Juliane Maria Guerreiro-Tanomaru
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  4. Bruno Cavalini Cavenago
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  5. Marco Antonio Hungaro Duarte
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  6. Mário Tanomaru-Filho
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Corresponding author

Correspondence to Mário Tanomaru-Filho.

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The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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For this type of study, formal consent is not required. Informed consent was obtained from all individual participants included in the study.

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Espir, C.G., Nascimento-Mendes, C.A., Guerreiro-Tanomaru, J.M. et al. Shaping ability of rotary or reciprocating systems for oval root canal preparation: a micro-computed tomography study. Clin Oral Invest 22, 3189–3194 (2018). https://doi.org/10.1007/s00784-018-2411-4

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  • DOI: https://doi.org/10.1007/s00784-018-2411-4

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