Abstract
Objectives: Evaluate of the heated air jet temperature (T) in the pulp chamber on cavity 5 depths and photoactivation stages for a bulk fill resin restorative protocol is evaluated. Methods: Class I cavity preparations were conducted at different depths (n = 8) through two protocols for adhesive volatilization (23 °C and 40 °C) and cavities were restored with the Filtek Bulk Fill resin. The pulp chamber temperature variation was evaluated at four steps (times) during the restorative protocol: I (initial), V (after volatilization), A (after photoactivation of the adhesive), and C (after photoactivation of the composite resin). To verify the assumptions of the normality of the errors and homoscedasticity, the Shapiro Wilk and Levene tests were conducted. Subsequently, two-way and three-way analysis of variance was carried out, followed by Tukey's post-hoc analysis (α = 0.05). Results: The maximum T at the different restorative steps, regardless of the volatilization protocol and cavity depth, was as follows: I (36.8 °C) = V (36.9 ºC) < A (37.2 °C) = R (37.8 ºC) (p <0.05). During V, a small greater variation was observed in pulp chamber temperature when dentin was volatilized at 40 °C (p <0.05) at very deep cavity depths (0.31 °C). The largest temperature variations (p <0.05) were observed during A (0.17–0.59 °C) and R (0.50–1.06 °C), reaching peak temperatures in the cavities.
Highlights
Dentin adhesives have the following components: resinous monomers, polymerization initiators, inhibitors or stabilizers, solvents, and particles of inorganic charge
As for the initial averages (36.8 °C) and those obtained after volatilization (36.9 °C) were lower and statistically similar; further, the photoactivation temperatures required for the adhesive system (37.2 oC) and restoration (37.8 oC) were observed to be greater (Figures 2 and 3)
The scientific interest in protocols that improve the quality of the adhesive layer and the hybrid layer has resulted in the formation of composite resin restorations with enhanced resistances; this has been achieved via inspiring research based on the volatilization of solvents with rising temperatures (Alexandre, et al, 2008; Klein-Júnior, et al, 2008; Reis, et al, 2009; Reis, et al, 2010; Ogura, et al, 2012; Ferreira-Barbosa, et al, 2020)
Summary
Dentin adhesives have the following components: resinous monomers, polymerization initiators, inhibitors or stabilizers, solvents, and particles of inorganic charge. The use of a heated air jet for volatilization in adhesive systems has been evaluated in some studies. The use of this jet is promising because of the high bond strength values achieved for the resin/dentin interface (Alexandre, et al, 2008; KleinJúnior, et al, 2008; Reis, et al, 2009; Reis, et al, 2010; Ogura, et al, 2012), in addition to higher stability imparted to the dentin matrix and the best module of long-term elasticity achieved for macro hybrid layer models (Matuda, et al, 2016; FerreiraBarbosa, et al, 2020)
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