AvaliaÃÃo in vitro da microinfiltraÃÃo marginal em cavidades classe II submetidas a diferentes estresses mecÃnicos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

The aim of this work was to evaluate âin vitroâ the mechanical stress influence over the marginal microlekage of class II cavities restored with Filtek Z-250Â adhesive restorative system. It was selected 16 sound human pre-molars with completely formed roots that had their apices and cusps cut. It was made the cavities, with cervical end in cement, then the specimens were repaired and identified, in an aleatory way, and divided into 4 groups. All specimens of the first group were kept into distilled water at 37ÂC while the remaining specimens suffered mechanical cycling with 8Kgf for 100.000, 250.000 and 500.000 cycles, respectively. All the components were submitted to thermocycling with temperature ranging from 5ÂC (Â5ÂC) to 55ÂC (Â5ÂC) during 500 cycles being then submerged into 0,5% basic fucsin. The dye penetration was measured with a stereoscope mangnifying glass, increased 40 times, and the results were submitted to Kruskal-Wallis statistic test with p>0,05. The results showed that the specimens submitted to thermocycling only presented some marginal infiltration score 1 while the ones submitted to both cyclings showed a greater amount of infiltrated samples and greater infiltration scores. It was concluded that thermo and mechanocycling provoked negative effects to the tooth/restoration interface of class II cavities repaired with composites, although the results werenât statistically significant

ASSUNTO(S)

infiltraÃÃo dentÃria odontologia composite resins dental leakage dental restoration forÃa oclusal occlusal force resinas compostas

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