Influence of the Passive Evaporation of adhesive on the conductance of dentin
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Cristian Bersezio [1] ; Sebastian Toledo [1] ; Claudia Letelier [1] ; Andrea Werner [1] ; Osmir Batista Oliveira Jr [2] ; Ziyad S Haydar [3] ; Javier Martín [1] ; Eduardo Fernández [1]
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[1] University of Chile
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[2] UNESP
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[3] Universidad de Los Andes
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- Localización: Revista clínica de periodoncia, implantología y rehabilitación oral, ISSN-e 0719-0107, Vol. 10, Nº. 1, 2017, págs. 38-40
- Idioma: inglés
- Enlaces
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Resumen
ABSTRACT: Aim: Determine the influence of time of passive evaporation of the solvent in a universal adhesive on the hydraulic conductance and permeability of dentin in an ex vivo human model. Henceforth, 60 healthy non-occluding third molars, indicated for therapeutic extraction/removal, of informed and consented patients aged between 18 and 30 years, were used here in. First, extracted teeth were incorporated into epoxy resin blocks and then dentin disks (1mm +/- 0.1 mm thick) were prepared. Dentin was acid etched with 35% ortho-phosphoric acid for 15 seconds in order to remove the smear layer and obtain permeable dentin. Samples were then randomized and divided into 5 groups (n=12). A Single Bond Universal adhesive layer with different time of passive evaporation of the solvent was then applied: GC=10 seconds, G1=30 seconds, G2=60 seconds, G3=300 seconds and G4=50 minutes. Finally, the flow rate was measured using a diffusion chamber, a model previously proposed by Pashley et al. Results: The obtained hydraulic conductance averages were as follows: GC=0.00052, G1=0.00018, G2=0.00006, G3=0.00005, G4=0.00005 expressed in uL•cm-2•min-1cm•H2O-1. For comparisons between groups, ANOVA and post hoc Tukey (ρ<0.05) tests were applied, resulting in a statistically significant difference between the GC group and all experimental groups (ρ <0.05). An influence of solvent passive evaporation thereby reducing hydraulic conductance in the experimental groups, was detected.
