Objectives: The present study is aimed at performing a scanning electron microscope (SEM) analysis to evaluate the effect of HF on the surface of feldspathic, alumina- and zirconia-reinforced ceramics. Materials and Methods: 45 specimens of feldspathic (n=15), alumina (n=15) and zirconia (n=15) ceramics were collected. 5 specimens of each type of ceramics were not subjected to any surface treatment and analysed with SEM as controls. The remaining 30 samples were etched with 40% hydrofluoric (HF) acid gel for 2 min and then subjected to SEM analysis. Five areas of each sample were randomly selected and photographed at 0.5, 1.5 and 7.41 K X magnifications. Results: The SEM investigation of the acid etched specimens revealed micro-morphological changes in the surfaces of feldspathic, alumina and zirconia ceramics respectively. A self-adhesive universal resin cement is desirable to obtain durable bonding to polycrystalline ceramics. Conclusions and Significance: The adhesion between resin cements and silanated feldspathic ceramics can guarantee a valid retention of all-ceramic restorations, whereas the adhesion between polycrystalline ceramics and dental tissues remains controversial and could lead the restoration to failure. Chemically compatible dedicated cements should be used in such cases.

Acid etching surface treatment of feldspathic, alumina and zirconia ceramics: a micro-morphological SEM analysis.

TRAINI, TONINO;
2006

Abstract

Objectives: The present study is aimed at performing a scanning electron microscope (SEM) analysis to evaluate the effect of HF on the surface of feldspathic, alumina- and zirconia-reinforced ceramics. Materials and Methods: 45 specimens of feldspathic (n=15), alumina (n=15) and zirconia (n=15) ceramics were collected. 5 specimens of each type of ceramics were not subjected to any surface treatment and analysed with SEM as controls. The remaining 30 samples were etched with 40% hydrofluoric (HF) acid gel for 2 min and then subjected to SEM analysis. Five areas of each sample were randomly selected and photographed at 0.5, 1.5 and 7.41 K X magnifications. Results: The SEM investigation of the acid etched specimens revealed micro-morphological changes in the surfaces of feldspathic, alumina and zirconia ceramics respectively. A self-adhesive universal resin cement is desirable to obtain durable bonding to polycrystalline ceramics. Conclusions and Significance: The adhesion between resin cements and silanated feldspathic ceramics can guarantee a valid retention of all-ceramic restorations, whereas the adhesion between polycrystalline ceramics and dental tissues remains controversial and could lead the restoration to failure. Chemically compatible dedicated cements should be used in such cases.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11564/369293
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