The effect of etching on a number of glass ionomer cements.
Aust Dent J
; 35(4): 338-44, 1990 Aug.
Article
em En
| MEDLINE
| ID: mdl-2275652
ABSTRACT
In view of the continuing interest in the use of glass ionomer cements as a dentine substitute or base under composite resins, further investigations were carried out on the effects of the length of time of etching of the surface of the cement prior to the placement of the resin. A number of cements are available on the Australian market which are advocated for use in this technique. Each of them was subjected to etching for periods of 15, 30, 45, or 60 seconds and then stored in water for one week. Examination under a dissecting microscope and a scanning electron microscope revealed some variation in results between the different cements. It would appear that not all those materials presently marketed for this purpose are entirely suitable. Whilst 15 seconds is the preferred time for most cements, some require times up to 60 seconds to achieve the best result. Also, some of the cements showed signs of cracking, expansion and distortion after they had been stored in water for one week to allow for maturation before being prepared for viewing under the SEM. It is suggested that this group of cements is not suitable for the 'sandwich' technique.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Condicionamento Ácido do Dente
/
Cimentos de Ionômeros de Vidro
Idioma:
En
Ano de publicação:
1990
Tipo de documento:
Article