Avaliação comparativa da absorção, solubilidade e dureza em reembasadores resilientes submetidos a termociclagem / Comparative evaluation of two permanent denture soft liners in water sorption, solubility and hardness by thermal cycling

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The aim of this study was to evaluate the effect of thermocycling on sorption, solubility and Shore A hardness of two resilient definitive lining materials: 1) auto-polymerized silicone base (Sofreliner MS); and 2) heat-polymerized plasticized acrylic resin (Super - soft). To prepare the samples, twenty aluminium matrixes were made (ten for sorption and solubility and ten for Shore A hardness) placed in a flask order to obtain a cast pressed mold, and then filled with resilient lining materials, handled according to the manufacturer?s directions. The hardness samples were submitted for readings in a Shore A durometer (GS ? 709 Teclock, Osaka, Japan). After the readings, the samples were submitted to thermal cycling treatment in a thermal cycler machine (MSCT ? 3 PLUS) for 2.000 cycles at temperatures ranging from 5±1oC to 55±1oC and a 60-second dwell time. After thermal cycling new readings of hardness were done, and the values of sorption and solubility calculated by Kasanji &Watkinson equation. The values were submitted to Shapiro ? Wilks analysis followed by Student test, with 5% of significance. Sorption and solubility showed statistical significance for both materials (2,69 ± 0,16 and 1,59 ± 0,24 for Super ? soft and 1,41 ± 0,21 and 0,01 ± 0,1 for Sofreliner MS) (p<0,05). For Shore A hardness the thermal cycling showed no effect for both materials (64 for Super ? soft and 30 for Sofreliner MS) (p>0,05). Sofreliner MS showed the lower values for sorption, solubility and Shore A hardness. Withing the limitations of this in vitro study Sofreliner MS showed best properties

ASSUNTO(S)

materiais dentarios protese dentaria completa complete denture resinas acrilicas dental materials acrylic resins

ACESSO AO ARTIGO

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