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Fracture resistance and stress distribution of weakened teeth reinforced with a bundled glass fiber–reinforced resin post

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Abstract

Objectives

To make an in vitro assessment of fracture resistance of weakened and non-weakened teeth receiving intraradicular reinforcement using Rebilda bundled glass fiber–reinforced composite posts (GT), Rebilda conventional glass fiber posts (RP), or both systems combined (GT + RP).

Materials and methods

Eighty sound bovine incisors were prepared and divided randomly into eight groups as follows: (a) nWnR: without simulating weakness, and without intraradicular reinforcement; (b) WnR: simulating weakness, but without intraradicular reinforcement; (c) nWGT: without simulating weakness, but with GT; (d) WGT: simulating weakness, and with GT; (e) nWRP: without simulating weakness, but with RP; (f) WRP: simulating weakness, and with RP; (g) nWGTRP: without simulating weakness, but with GT + RP; (h) WGTRP: simulating weakness, and with GT + RP. The specimens were subjected to the load-to-fracture test using the DL-2000MF universal testing machine. The finite element method assessed the mechanical behavior and stress distribution in endodontically treated teeth.

Results

The groups nWGTRP and WGTRP presented the best results in the load-to-fracture test, with the former being better than the latter, but with no statistically significant difference (P > 0.05). However, there was a significant difference between these and the other groups (P < 0.05), except for nWRP. Stress distribution inside the canal wall was different among the groups, with promising mechanical behavior for nWGTRP and nWRP.

Conclusions

The Rebilda conventional fiber post (RP), combined with the Rebilda bundled glass fiber–reinforced composite post (GT) improves the resistance and stress distribution of immature teeth.

Clinical relevance

Longitudinal fracture is less frequent in teeth restored with GT and RP posts.

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Funding

This study was supported by the Restorative Dentistry Department, Institute of Science and Technology, São Paulo State University (ICT-UNESP), São José dos Campos, SP, Brazil.

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Authors and Affiliations

  1. Department of Restorative Dentistry, Endodontics Division, Institute of Science and Technology, São Paulo State University (UNESP), Av. Francisco José Longo 777, São Dimas, São José dos Campos, SP, 12245-000, Brazil

    Thaís da Silva Alves Santos, Amjad Abu Hasna, Ricardo Toledo Abreu & Cláudio Antonio Talge Carvalho

  2. Department of Dental Materials and Prosthodontics, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, Brazil

    João Paulo Mendes Tribst, Guilherme Schmitt de Andrade & Alexandre Luiz Souto Borges

  3. Department of Restorative Dentistry, Operative Dentistry Division, Institute of Science and Technology, São Paulo State University (UNESP), São José dos Campos, Brazil

    Carlos Rocha Gomes Torres

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  1. Thaís da Silva Alves Santos
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Correspondence to Amjad Abu Hasna.

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Santos, T.d.A., Abu Hasna, A., Abreu, R.T. et al. Fracture resistance and stress distribution of weakened teeth reinforced with a bundled glass fiber–reinforced resin post. Clin Oral Invest 26, 1725–1735 (2022). https://doi.org/10.1007/s00784-021-04148-4

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