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Accuracy of electronic apical functions of a new integrated motor compared to the visual control of the working length—an ex vivo study

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Abstract

Objectives

To evaluate ex vivo the efficacy of the integrated motor Tri Auto ZX2 in controlling the apical extent of preparation compared to conventional visual control (CVC) of the working length (WL).

Materials and methods

Eighty standardized mandibular premolars were divided into five groups (n = 16). In the CVC group, instruments were used in continuous rotation (CR) and visual control performed by means of rubber stoppers. For each of the remaining groups, it was assigned a combination of a motion (CR or optimal torque reverse (OTR)), and an apical function (Auto Apical Reverse (AAR) or Optimum Apical Stop (OAS)). Root canals were prepared using the apical functions at 0.5 mark using an alginate model. Difference between the final WL and the actual length post-instrumentation was calculated. Data were analyzed statistically with the significance set at 5% (ANOVA, Tukey HSD).

Results

There was no difference in the mean WL among the groups, except between the CR combined to OAS compared to CVC (P > 0.05). Although CVC resulted in two cases beyond the foramen, no significant difference was found among the groups when comparing the distributions of measurements (P > 0.05).

Conclusions

All combinations of motion and apical control functions of Tri Auto ZX2 provided an adequate apical limit ex vivo, similar to the visual control using rubber stoppers.

Clinical relevance

TriAuto ZX2 was efficient to control the apical extent of preparation dispensing the need for calibrating the files, regardless of the different settings. This motor might potentially prevent over-instrumentation by continuously monitoring the apical limit.

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Authors and Affiliations

  1. Department of Endodontics, School of Health and Bioscience, Pontifical Catholic University of Paraná, Curitiba, Brazil

    Adriane Antoniw Klemz, Alessandra Timponi Goes Cruz, Everdan Carneiro, Vânia Portela Ditzel Westphalen & Ulisses Xavier da Silva Neto

  2. Department of Periodontics & Endodontics, University at Buffalo, 240 Squire Hall, Buffalo, NY, 14214, USA

    Lucila Piasecki

Authors
  1. Adriane Antoniw Klemz
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  2. Alessandra Timponi Goes Cruz
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  3. Lucila Piasecki
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  4. Everdan Carneiro
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  5. Vânia Portela Ditzel Westphalen
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  6. Ulisses Xavier da Silva Neto
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Correspondence to Lucila Piasecki.

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Ethical approval was obtained from School of Health and Biosciences of the Pontifical Catholic University (Curitiba, Brazil) (protocol # 2.600.486).

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Klemz, A.A., Cruz, A.T.G., Piasecki, L. et al. Accuracy of electronic apical functions of a new integrated motor compared to the visual control of the working length—an ex vivo study. Clin Oral Invest 25, 231–236 (2021). https://doi.org/10.1007/s00784-020-03357-7

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  • DOI: https://doi.org/10.1007/s00784-020-03357-7

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