Evaluation of fastening systems indicated for cementing carbon fiber pins through shear strength by extrusion: an in vitro study / Avaliação de sistemas de fixação indicados para cimentação de pinos de fibra de carbono por resistência ao cisalhamento por extrusão: estudo in vitro

Joanna Puchala, João Victor Frazão Câmara, Gisele Damiana da Silveira Pereira, Isabel Ferreira Barbosa, Ana Clara Correa Duarte Simões, Justine Monteiro Monnerat Tinoco, Hana Fried, Renato Feres de Carvalho Vianna, Sonia Groisman, Paulo Ricardo Barros de Campos, Josué Junior Araujo Pierote


Objective: To evaluate four fixation systems for cementing carbon fiber pins, at different depths, through shear strength by extrusion. Material and Methods: The crown was separated from the root through a double-sided diamond disc. The root canals were filled using the thermoplastic technique and the plasticized filling material was condensed to 5 mm below the apex. The samples were randomly assigned to 8 experimental groups (n = 4). The carbon fiber pins were fixed, applying zinc phosphate cement, the resin-modified glass ionomer cement (ReIyX™ Luting 2), resin cement RelyX™ ARC and ReIyX™ Unicem universal self-adhesive resin cement. Each tooth was sectioned perpendicularly along the long axis of the prefabricated pin with a diamond disc in order to obtain a slice of each depth, with a thickness of 1 mm, removed from 1 mm, 5 mm and 9 mm from the limit cervical of each root. The samples were stored in an oven at 37 °C for 48 hours and subjected to the shear strength test by extrusion. The results were subjected to analysis of variance at the level of 5% probability (p <0.0001). Results: Through Tukey's Multiple variation test the following results were presented in MPa: RXUC - 9.914a; RXUM - 9,037ab, ARCC - 8,671abc; RXUA - 8,631abc; ARCM - 8,274abc; FZM - 6,544abc; FZC - 5,611abc; ARCA - 5,314abc; RXLA - 5,271abc; FZA - 4,746bcd; RXLM - 4,615cd; RXLC - 2.705d. Conclusions: The highest average shear strength by extrusion was obtained by RelyX™ Unicem cement in the cervical third. When observed the behavior of the same cement in the different root thirds, the RelyX™ Luting 2 cement was the only one to present a statistically significant difference between the thirds.


Tooth Root, Carbon Fiber, Shear Strength.


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DOI: https://doi.org/10.34117/bjdv.v7i5.29604


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