Influence of different photoinitiators on the resistance of union in bovine enamel: an in vitro study

Paulo Ricardo Barros De Campos,Lizandra Esper Serrano,João Victor Frazão Câmara,Raquel Rytholz,Suelem Chasse Barreto,Gisele Damiana Da Silveira Pereira,Renata Aguiar Costa Di Leta Gregorio,Sonia Groisman,Josué Junior Araujo Pierote,Marcelo Dos Santos Basílio

doi:10.33448/rsd-v9i10.8832

Abstract

To evaluate the action of photoinitiators on the microtensile resistance of adhesive systems and resins composed in bovine enamel. Forty dental fragments, with flat and smooth enamel surfaces, obtained from the coronary buccal face of healthy bovine incisors, were randomly assigned to 4 experimental groups (n = 10) according to the different adhesive systems and composite resins used: Group 1- Ambar APS + Vittra APS; Group 2- Ambar APS + Opallis; Group 3- Ambar + Vittra APS; Group 4- Ambar + Opallis. After composite restoration, the samples were sectioned to obtain toothpicks that were subjected to the microtensile test (1.0 mm/min). The data obtained were subjected to statistical analysis. The Kruskal-Wallis test revealed no significant differences between groups (p <0.05). Values in MPa were: G1- 18.58 MPaa; G2 - 19.83 MPaa; G3- 19.87 MPaa; G4- 20.99 MPaa. The result of the Mann-Whitney test showed no significant differences due to the adhesive (Ambar Universal- 19.58 MPaa, Ambar APS Universal- 19.87 MPaa) and the composite resin used (Vittra APS- 19.52 MPAa, Opallis - 20.56 MPAa). The use of different photoinitiators in the composition of adhesive systems and restorative composites did not influence their adhesive resistance values due to the standardization of the factors that influence their cure pattern.

Highlights

Adhesive systems have significantly revolutionized dentistry, making restorative procedures more conservative and longlasting (Cadenaro et al, 2019; Azad, Ata, Zandi, Shokrollahi & Solhi, 2018)
This study aimed to evaluate the microtensile strength of adhesive systems and composite resins with different types of photoinitiators when applied to bovine enamel
The following restorative materials were used in this study: 37% phosphoric acid FGM, Ambar and Ambar APS adhesive systems, Opallis and Vittra APS composite resins, and the Valo photoactivator

Summary

Introduction

Adhesive systems have significantly revolutionized dentistry, making restorative procedures more conservative and longlasting (Cadenaro et al, 2019; Azad, Ata, Zandi, Shokrollahi & Solhi, 2018). The main objective of adhesive systems is to promote the retention of dental composites to the dental substrate, preventing failures and infiltration along the restoration margin (Cadenaro et al, 2019; Azad et al, 2018; Landuyt et al, 2007) Their correct polymerization, before inserting the composite resin, provides a higher degree of monomeric conversion, causing satisfactory mechanical properties for the adhesion layer. Camphorquinone is a solid compound with an intense yellowish color and, when presented in high concentrations in composite resin formulations, causes an undesirable effect on the final aesthetic of the material polymerized This reduces the amount of this photoinitiator in the composites, limiting the degree of monomer conversion and the depth of polymerization (Schneider, Cavalcante, Prahl, Pfeifer & Ferracane, 2012; Brandt, Tomaselli, Correr-Sobrinho & Sinhoreti, 2011)

Objectives

Methods

Results

Discussion

Conclusion