Influencia do tratamento de superficie e do tempo de armazenagem em agua sobre a resistencia a tração da união entre ceramica de infra-estrutura IPS Empress 2 e agente cimentante

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

The purpose of this study was to evaluate the effect of water storage (24 hours and 1 year) on the tensile bond strength between the IPS Empress 2 ceramic and material for fixation Variolink II under different superficial treatments. One hundred and eighty ceramic disks (5,5mm in diameter and 2,5m thick) were divid~d into 6 groups of the 15 discs each. Each group was submitted to different treatments: Groups 1 and 4- sandblasting with 50 mu m aluminum oxide; Groups 2 and 5- sandblasting with 100 mu m aluminum oxide; and, Groups 3 and 6- etching with 10% hydrofluoric acid for 20 seconds. After, silane was applied on treated ceramic surfaces and the ceramic disks of each group were bonded into pairs with Heliobond adhesive and Variolink II resin cement. After, the specimens of the Groups 1 to 3 were stored in distilled water at 37°C for 24 hours and the specimens of the Groups 4 to 6 were stored for one year. Afterwards, the specimens were submitted to a tensile strength test in an Instron machine at a cross - head speed of 1 mm/minute. The pattern of failure was examined with a light microscope at x 20 magnifications. The results were submitted to variance analysis and Tukey s test (p<0.05) and showed that storage conditions decreased the bond strength between ceramiclresin cement over the period of 1 year independent of the surface treatments. The surface treatments with 10% hydrofluoric acid achieved higher values of tensile bond strength (p<0.05) in relation to the sandblasting with 50 mu m and 100 mu m aluminum oxide for the storage time 24 hours and 1 year. The pattern of failure was mixed for acid etching with hydrofluoric acid and adhesive for sandblasting with 100 mu m and 50 mu m

ASSUNTO(S)

morfologia materiais dentarios ceramica odontologica

ACESSO AO ARTIGO

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