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Dentin thickness as a risk factor for vertical root fracture in endodontically treated teeth: a case-control study

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Abstract

Objectives

This study evaluated factors associated with vertical root fracture in endodontically treated teeth, using a cone-beam computed tomography (CBCT) image database.

Materials and methods

The sample for this case-control study consisted of 81 CBCT scans of teeth with vertical root fracture (VRF) and 81 CBCT scans of non-fractured teeth, matched by age, sex, and tooth position. The analyzed variables included dentin thickness, an intraradicular post, an adjacent implant, and a missing adjacent tooth. Student’s t test test was used to compare the quantitative variables. The chi-square test was used to compare the categorical variables. Logistic regression was performed to evaluate the association between the presence of VRF and the independent factors assessed.

Results

The mean dentin thickness of fractured teeth was 1.3 mm, whereas that of non-fractured ones was 1.5 mm (p < 0.001). There was no difference between the fractured and non-fractured groups, regarding implant frequency or missing adjacent tooth (p > 0.05). There were a significantly larger number of teeth with posts in the fractured versus non-fractured group (p = 0.007). However, dentin thickness ≤ 1.3 mm was the only factor associated with VRF in the multiple regression model (OR = 3.60, 95%CI = 1.76–7.37).

Conclusions

Dentin thickness may influence the development of VRF. Dentin thickness ≤ 1.3 mm is associated with a greater likelihood of fracture than ≥ 1.4 mm.

Clinical relevance

This study suggests there may be a minimum amount of safe dentin thickness that should be preserved after endodontic instrumentation.

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Authors and Affiliations

  1. Department of Stomatologic Sciences, School of Dentistry, Federal University of Goiás, Goiânia, Brazil

    Lorena Rosa Silva, Kaique Leite de Lima, Ananda Amaral Santos, Carlos Estrela & Fernanda Paula Yamamoto-Silva

  2. Department of Prevention and Oral Rehabilitation, School of Dentistry, Federal University of Goiás, Goiânia, Brazil

    Cláudio Rodrigues Leles

  3. Department of Oral Diagnosis, School of Dentistry, University of Anápolis, Av. Universitária, km 3,5. Cidade Universitária, Anápolis, CEP 75083-515, Brazil

    Brunno Santos de Freitas Silva

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  1. Lorena Rosa Silva
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Correspondence to Brunno Santos de Freitas Silva.

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The authors declare that they have no conflict of interest.

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This study was approved by the ethics committee of the university (CAAE 80421917.0.0000.5083) and conducted in accordance with the 1964 Helsinki declaration.

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For this type of study (retrospective study), formal consent is not required.

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Silva, L.R., de Lima, K.L., Santos, A.A. et al. Dentin thickness as a risk factor for vertical root fracture in endodontically treated teeth: a case-control study. Clin Oral Invest 25, 1099–1105 (2021). https://doi.org/10.1007/s00784-020-03406-1

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