Avaliação in vitro da resistência adesiva e degradação da interface de união entre cimentos resinosos e uma cerâmica aluminizada tratada internamente com laser / In Vitro analsis of bond strength and degradation method between bond interface of aluminous ceramic and resin cements

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The aim of this study was to evaluate the influence of different surface treatments on resistance to degradation between In-Ceram Alumina and two resin-based cements. Sixteen experimental groups were formed according to ceramic treatment: Sandblasting (S), Rocatec System (R), Nd:YAG Laser (Nd), Nd:YAG Laser plus Rocatec System (NR); luting cement: Panavia F (Kuraray) or Relyx Unicem (3M ESPE); and aging method: water (W) or sodium hypochlorite (H). Sixty four In-Ceram Alumina blocks (10x10x6mm) received four surface treatments: Al2O3 sandblasting; Al2O3 sandblasting + Rocatec Plus; Al2O3 sandblasting + Nd:YAG Lase; Al2O3 sandblasting + Nd:YAG Laser + Rocatec Plus. Each conditioned ceramic block was bonded to a composite block using a resin cement system. After 24h storage time, the blocks were sectioned to obtain sticks with cross-sectional area of 1.0mm2. The specimens were loaded to failure in a universal testing machine at a crosshead speed of 0.5mm/min. The fractured surface morphology of the debonded specimens was observed (40X) to evaluate the fracture pattern. Failure modes were classified as adhesive, cohesive in ceramic, cohesive in resin cement and mixed. The ceramic treatment and the aging method significantly affected the microtensile bond strength. Nd:YAG surface treatment resulted in the best bond strength values. To groups luted with Panavia F cement the microtensile bond strength values were: SW: 27,71±6,3; RW: 35,67±5,13; NdW: 42,49±6,8; NdRW: 37,41±4,76; SH: 22,27±6,05; RH: 27,49±8,83; NdH: 32,24±6,94; NdRH: 31,75±7,77. To groups luted with RelyX cement: SW: 26,74±6,34; RW: 35,07±6,02; NdW: 41,05±7,71; NdRW: 33,85±6,03; SH: 22,77±7,37; RH: 27,84±6,26; NdH: 36,42±5,08; NdRH: 27,6±5,8. Nd:YAG laser was the most effective surface treatment, followed by Nd:YAG+Rocatec, Rocatec and Al2O3 sandblasting. Resin cements presented similar behaviors in spite of aging. NaOCl 12h-immersion decreased Bond strength values.

ASSUNTO(S)

cerâmica aluminum oxide sandblasting rocatec nd:yag laser rocatec sodium hypochlorite ceramic microtração Óxido de alumínio laser de nd:yag hipoclorito de sódio microtensile test

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