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Effect of canal preparation with XP-endo Shaper and ProTaper Next on root canal geometry and dentin thickness of mandibular premolars with radicular grooves and two canals: a micro-CT study

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Abstract

Objectives

This study aimed to evaluate the effects of different shaping protocols on the root canal geometry and remaining dentin thickness of mandibular premolars with radicular grooves (RG) and two canals by means of micro-CT.

Materials and methods

Mandibular premolars with RG and two canals were matched based on their similar morphological dimensions and assigned to 2 experimental groups according to the canal preparation (n=8): XP-endo Shaper (XPS) and ProTaper Next (PTN) systems. Before and after preparation, morphometric measurements of the volume, surface area, structure model index, area, perimeter, roundness, major and minor diameters, as well as untouched canal walls, canal transportation, and dentin wall thickness were evaluated. Data were statistically compared within and between groups using the independent sample t test (α=5%).

Results

XPS revealed less changes in volume, surface area, area, perimeter, and major and minor diameters (P<0.05). There was no significant difference in structure model index (SMI), roundness, and percentage of untouched canal walls between groups (P>0.05). XPS resulted in less apical canal transportation and a higher remaining dentin thickness toward the RG compared to PTN in lingual canals (P<0.05).

Conclusions

XPS revealed fewer changes in root canal geometry as well as lower transportation and a greater remaining dentin thickness in the lingual canals toward the RG compared to PTN.

Clinical relevance

Internal and external anatomical characteristics of mandibular premolars might have an influence on biomechanical preparation. Considering the risk of perforation, the canal preparation using XPS appears to be more conservative compared to PTN.

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Funding

This study was supported by grants from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP n° 2018/23913-5) and Financiadora de Estudos e Projetos (FINEP), Brazilian Funding Agencies.

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Authors and Affiliations

  1. School of Dentistry, University of Ribeirão Preto, Avenida Costábile Romano 2201, Ribeirão Preto, SP, 14096-900, Brazil

    Nathália Mancioppi Cerqueira, Victoria Gabriela Louzada, Yara Teresinha Corrêa Silva-Sousa, Walter Raucci-Neto & Graziela Bianchi Leoni

Authors
  1. Nathália Mancioppi Cerqueira
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  2. Victoria Gabriela Louzada
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  3. Yara Teresinha Corrêa Silva-Sousa
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  4. Walter Raucci-Neto
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  5. Graziela Bianchi Leoni
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Contributions

GBL, NMC, YTCSS, and WRN contributed to the conception and organization of the study.

GBL and NMC participated in the study design.

GBL, NMC, and VGL conducted the experiments.

GBL, NMC, and VGL manuscript and conducted data analysis.

GBL, NMC and WRN participated in interpretation of the results.

GBL and NMC wrote the manuscript.

All authors have read, reviewed, and approved the final manuscript.

Corresponding author

Correspondence to Graziela Bianchi Leoni.

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Conflict of interest

The author Nathália Mancioppi Cerqueira denies any conflicts of interest related to this study. The author Victoria Gabriela Louzada denies any conflicts of interest related to this study. The author Yara Teresinha Corrêa Silva Sousa denies any conflicts of interest related to this study. The author Walter Raucci Neto denies any conflicts of interest related to this study. The author Graziela Bianchi Leoni denies any conflicts of interest related to this study.

Ethical approval

All procedures performed in this study 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 (ethics committee approval protocol 98181018.5.0000.5498).

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Cerqueira, N.M., Louzada, V.G., Silva-Sousa, Y.T.C. et al. Effect of canal preparation with XP-endo Shaper and ProTaper Next on root canal geometry and dentin thickness of mandibular premolars with radicular grooves and two canals: a micro-CT study. Clin Oral Invest 25, 5505–5512 (2021). https://doi.org/10.1007/s00784-021-03858-z

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  • DOI: https://doi.org/10.1007/s00784-021-03858-z

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