Sorção e solubilidade de resinas compostas polimerizadas com luz halógena E LED / Sorption and solubility of composites cured with QTH and LED

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

Objective: Although dental polymers are considered insoluble structures they can absorb and release components when immersed in an aqueous environment. The aim of this study was to evaluate the water sorption and solubility of three hybrid composites cured by halogen (QTH) and light emitting diode (LED). Methods: According to ISO 4049, 32 discs of each composite (Herculite XRV, Tetric Ceram, Filtek Z250) were polymerized with a QTH (Optilux VLC 501) and LED (LEDemetron I) light curing units and divided into groups for each time of storage. The specimens were storage in a desiccator at a 37C and weight to a constant mass (m1). The discs were immersed in deionized water for 24h, 7 days and 28 days and re-weighted (m2). The reconditioning of the specimens was carried out until a constant mass was obtained (m3). The sorption and solubility of the materials were calculated and subjected to ANOVA and Tukey HDS tests (p<0.01). Results: There were not found statiscally significant differences between the light sources. The water sorption was increased with storage time for all the composites. The lowest sorption was attributed to Herculite XRV, followed by Tetric Ceram and Filtek Z250, with significant differences among them. Different periods of storage did not affect the solubility of Herculite XRV and Tetric Ceram, while Filtek Z250 showed reduction with prolonged storage time. Significance: The light polymerization using QTH and LED, with the same intensity and time of exposure did not affect water sorption and solubility of the tested composites.

ASSUNTO(S)

materais dentários polimerização dentística odontologia resinas dentárias

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