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The Effect of Viscosity and Application Mode of Phosphoric Acid on Bond Strength of GlassFiber Post

Authors Costa Scholz MF, Aboud Matos de Almeida R, Scholz N, Gomes GM, Masson-P MJ, Loguercio AD, Reis A, Bandéca MC

Received 6 September 2019

Accepted for publication 6 December 2019

Published 26 February 2020 Volume 2020:12 Pages 61—70


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 2

Editor who approved publication: Professor Christopher E. Okunseri

Maria Fernanda Costa Scholz,1 Rossana Aboud Matos de Almeida,2 Nelson Scholz,1 Giovana M Gomes,1 María José Masson-P,1 Alessandro D Loguercio,1,3 Alessandra Reis,1 Matheus C Bandéca2

1Department of Restorative Dentistry, State University of Ponta Grossa, Paraná, Brazil; 2The Post-Graduation Program in Dentistry, CEUMA University, São Luis, Maranhão, Brazil; 3Faculdad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito, Equador

Correspondence: Matheus C Bandéca
Post-Graduation Program in Dentistry, CEUMA University, Josue Montello, São Luis, Maranhão 65075-120, Brazil
Tel +55 98 982232998

Background: When a phosphoric acid is used, before applying an adhesive system, it is known that obtaining an effective adhesion to the root canal walls is a challenge. The aim of the present study was to evaluate the influence of phosphoric acid viscosity and application mode on the push-out bond strength (BS) values of fiberglass post to root dentin. The conditioning pattern on the root dentin was also evaluated.
Materials and Methods: The roots of 44 endodontically treated premolars were divided into 4 groups, of eleven teeth each, according to the combination of the main factors: phosphoric acid viscosity (liquid or gel) and application mode (passive or sonic). After application of the two-step etch-and-rinse adhesive system, the fiberglass posts were cemented with a dual-cure resin-cement. Roots were sectioned transversely into six 1-mm slices for push-out BS test at 0.5 mm/min. Some roots of each group were selected for evaluation of the conditioning pattern by scanning electron microscopy. BS results (three-way ANOVA and Tukey’s test) and the conditioning pattern (Kruskal–Wallis test and Mann–Whitney test) were statistically evaluated (α= 0.05).
Results: The highest BS value was observed with a liquid phosphoric acid under sonic application mode (p < 0.05), being all other groups similar to one another (p < 0.05). Also, the highest BS value was observed in the cervical third, followed by the medium and the apical thirds (p < 0.05). The sonic application produced better smear layer removal and opening of dentinal tubules for both viscosities (p = 0.015).
Conclusion: A better bonding of fiberglass posts to root canals can be achieved when the post spaces are conditioned with a liquid phosphoric acid under sonic application.

Keywords: fiberglass reinforced polymer, acid etching, post and core technique

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