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Development and validation of a method for creating incomplete vertical root fracture in extracted teeth

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Abstract

The present study reported a method for inducing incomplete root fracture in human extracted teeth for the purpose of evaluating the merits of different diagnostic imaging techniques. Thirty-five single-rooted teeth were inspected under magnification and transillumination to exclude previously fractured teeth. Tooth crowns were removed, and the root canals were prepared up to the ProTaper Next X4 (40.06) file. Each root was lined with wax and embedded in a polystyrene resin block. The setup was attached to a universal testing machine for pressing a customized conical wedge (diameter at tip: 0.6 mm; taper: 0.2 mm/mm) into the instrumented canal with a 2 kN load at 5 mm/min. The machine was programmed to stop after a sudden 10% drop in loading force. Each specimen was removed from the resin block and inspected under × 20 magnification and transillumination to identify the fracture characteristics (pattern, surfaces and root-third affected). The gap width of each specimen was measured at different locations along the fracture line. The protocol induced incomplete vertical root fractures in all specimens. Fracture widths were < 100 μm in all specimens (mean gap width: 34.9 μm). The proposed methodology was successful in inducing incomplete vertical root fractures with characteristics that resemble the clinical presentation of these conditions. The method is easy to execute, highly reproducible and helps to minimize bias in laboratory studies that aims to mimic vertical root fractures.

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Data availability

The datasets generated during and/or analysed during the current study are available in the UFSC Library repository (https://repositorio.ufsc.br/).

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Acknowledgements

The authors would like to thank the “Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)” for the financial assistance to carry out this research.

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Authors and Affiliations

  1. Department of Dentistry-Endodontics Division, Health Sciences Center, Federal University of Santa Catarina, Campus Reitor João David Ferreira Lima, Florianópolis, Santa Catarina, Brazil

    Luiz Carlos de Lima Dias-Junior, Marcio Corrêa, Cleonice da Silveira Teixeira, Diego Leonardo de Souza & Lucas da Fonseca Roberti Garcia

  2. Department of Endodontics, The Dental College of Georgia, Augusta University, Augusta, GA, USA

    Franklin R. Tay

  3. Department of Endodontics, School of Dentistry, Federal University of Goiás, Goiânia, Brazil

    Carlos Estrela

  4. Department of Diagnosis & Oral Health, Division of Endodontics, School of Dentistry, University of Louisville, Louisville, KY, USA

    Eduardo Antunes Bortoluzzi

Authors
  1. Luiz Carlos de Lima Dias-Junior
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  2. Marcio Corrêa
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  3. Cleonice da Silveira Teixeira
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  4. Diego Leonardo de Souza
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  5. Franklin R. Tay
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  6. Carlos Estrela
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  7. Lucas da Fonseca Roberti Garcia
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  8. Eduardo Antunes Bortoluzzi
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Contributions

LdeL: conceptualization, methodology, investigation, writing—original draft; MC: conceptualization, methodology; CdaST: methodology, investigation, writing—review & editing; DLdeS: methodology, investigation, writing—review & editing; FRT: validation, formal analysis; CE: resources, data curation; LdaFRG: conceptualization, writing—review & editing, project administration, funding acquisition, supervision; EAB: conceptualization, writing—review & editing, project administration, funding acquisition.

Corresponding author

Correspondence to Lucas da Fonseca Roberti Garcia.

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Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Ethical approval

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. The study was approved by the thics Committee of the Federal University of Santa Catarina—UFSC—(No. 4.444.914/2020).

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de Lima Dias-Junior, L.C., Corrêa, M., da Silveira Teixeira, C. et al. Development and validation of a method for creating incomplete vertical root fracture in extracted teeth. Odontology 111, 750–758 (2023). https://doi.org/10.1007/s10266-023-00787-z

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  • DOI: https://doi.org/10.1007/s10266-023-00787-z

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