Influência da termociclagem e do tratamento superficial da resina acrílica na resistência à tração da união com materiais reembasadores resilentes

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

The purpose of this study was to analyze the effect of thermo cycling and surface machining in the acrylic resin (QC-20) on the tensile bond strength with permanent soft liners (Eversoft, Mucopren Soft). Two hundred-forty samples were made and distributed in twenty-four variable’s groups with ten samples each group For making the samples, metal matrixes were invested in flasks, the mold was packed with acrylic resin and a spacer was used to divided the samples in the middle. After the resin curing, the samples were divided in six groups. Each group received a different treatment surface machining. Group 1- Samples without treatment surface machining; Group 2 –Samples with smoother non-grooved surface; Group 3- samples arranged with spherical drill; Group 4- samples prepared with Maxi-cut tungsten bur; Group 5- samples arranged with steel bur; Group 6- samples prepared with carborundum discs. After the surface machining the acrylic resins were joint with soft-liner material. Half of the samples were submitted to 4,000 thermal cycles (MSCT-3 PLUS - termoclycling machine) of 1 minute in water immersion in 5±1o C and 1 minute in 55±1o C, and the other half, were not. Afterwards, the samples were submitted to the tensile bond strength test in a universal testing machine (EMIC-DL500MF) with a crosshead speed of 5 mm/min. The results, after Tukey test at 5% of probability. When we observe the averages of the values of the bond strength to the traction independent of the treatment of thermal cycling, the Mucopren Soft material presented the highest values. (...continue)

ASSUNTO(S)

materiais dentarios protese dentaria completa

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