RESEARCH ARTICLE


Effect of 0.2% Chitosan Associated with Different Final Irrigant Protocols on the Fiber Post Bond Strength to Root Canal Dentin of Bovine Teeth: An In-vitro Study



Maura Cristiane Gonçales Orçati Dorileo1, Ricardo Danil Guiraldo2, Murilo Baena Lopes2, Daniel de Almeida Decurcio3, Orlando Aguirre Guedes4, *, Andreza Maria Fábio Aranha1, Álvaro Henrique Borges1, Alcides Gonini Júnior5
1 Department of Endodontics, Dental School, University of Cuiabá, Cuiabá, Mato Grosso, Brazil
2 Department of Operative Dentistry, Dental School, University of North Paraná, Londrina, Paraná, Brazil
3 Department of Stomatology, Dental School, Federal University of Goiás, Goiânia, Goiás, Brazil
4 Department of Endodontics, Dental School, Evangelical University of Goiás, Anápolis, Goiás, Brazil
5 Department of Operative Dentistry, Dental School, State University of Londrina, Londrina, Paraná, Brazil


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Creative Commons License
© 2022 Dorileo et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Department of Endodontics, Dental School, Evangelical University of Goiás, Av. Universitária, Km 3,5, Cidade Universitária, 75083-515, Anápolis, Goiás, Brazil; Tel: +55 62 3310-6630; E-mail: orlandoaguedes@gmail.com


Abstract

Objective:

This in-vitro study investigated the effect of 0.2% Chitosan associated with different final irrigant protocols on the bond strength of fiber posts (FP) to root canal dentin.

Methods:

Fifty bovine incisors roots were prepared using the ProTaper Universal system, irrigated with 2.5% sodium hypochlorite, and divided into one control group (n=10) with no final irrigant protocol and four experimental groups (n=10), which were defined according to the combination of chelating solution (17% EDTA and 0.2% Chitosan) and irrigant activation/delivery method [conventional irrigation (CI), and passive ultrasonic irrigation (PUI)]. Post spaces were prepared to a depth of 12 mm using #1-5 Largo drills, and the FP were cemented using self-adhesive resin cement. Two slices of 2 mm in thickness from each third were obtained and submitted to the micropush-out test. After testing the push-out strength, the slices were analyzed under a stereomicroscope at 40× magnification for bond failure patterns determination. Statistical analysis was performed using three-way ANOVA followed by Tukey’s test (α = 0.05).

Results:

The control and 17% EDTA + CI groups exhibited significantly lower bond strength than 0.2% Chitosan + CI, 17% EDTA + PUI, and 0.2% Chitosan + PUI groups in the cervical third (P = 0.00). The cervical third had higher values than the middle and apical thirds in control (P = 0.00), 17% EDTA + PUI (P = 0.00), and 0.2% Chitosan + PUI groups (P = 0.00). Adhesive cement-dentin failure type was predominant in all groups.

Conclusion:

The use of 0.2% chitosan did not affect the bond strength of FP to root dentin. Passive ultrasonic activation of chelating solutions resulted in an improvement in bonding strength.

Keywords: Bond strength, Chelating agent, Chitosan, Fiber post, Passive ultrasonic activation, Smear layer.