Hot air stream reduces cytotoxicity of light-cured calcium hydroxide based cements

Abstract
The light-cured calcium hydroxide based cements have incomplete polymerization and unconverted monomers can cause pulp cell damage. The aim of this study was to evaluate the influence of a warm and hot air stream on the cytotoxicity of light-cured calcium hydroxide based cements. The materials Dycal (conventional cement), Biocal, Hidrox-Cal, and Ultra-Blend Plus (light-cured calcium hydroxide cements) were submitted to cytotoxicity analysis after polymerization, without vs. with previous heat treatment with a warm (37°C) and a hot (60°C) air stream. Following polymerization, cements were maintained in culture medium for 24 hours and 7 days, and subjected to the MTT test. Data were analyzed using analysis of variance (ANOVA) followed by post-hoc Student-Newman-Keuls (<0.05). The results indicated significant differences between the materials according to their composition, i.e., light-cured cements treated with a jet of warm air showed similar cytotoxicity levels to those observed for conventional cement, suggesting that they may be considered alternatives in cases requiring pulp-capping treatment. Application of a hot air stream reduced cytotoxicity of materials tested.
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Bibliographic reference
Klein-Júnior, Celso-Afonso ; Zimmer, Roberto ; Borghetti, Diana-Lina-Bronca ; Portella, Fernando-Freitas ; Abich, Flávia-Carolina ; Marinovic, Daniel Rodrigo ; Hosaka, Keiichi ; Reston, Eduardo-Galia. Hot air stream reduces cytotoxicity of light-cured calcium hydroxide based cements. En: Journal of Clinical and Experimental Dentistry, 12 3 2020: 215-219