Method of surface treatment employed 85 per cent phosphoric acid for 30 seconds to determine the effect of a simple acid decalcification on adhesion.
The increased adhesion obtained intraorally on treated enamel surfaces may be due to several factors...
(a) a tremendous increase in surface area due to the acid etching action.
(b) the exposing of the organic framework of enamel which serves as a network, in and about which the acrylic can adhere.
(c) the formation of a new surface due to precipitation of new substance, for instance, calcium oxalate, organic tungstate complex, and so on,to which the acrylic might adhere.
(d) the removal of old, fully reacted, and inert enamel surface, exposing a fresh, reactive surface more favorable for adhesion.
(e) the presence on the enamel surface of an adsorbed layer of highly polar phosphate groups, derived from the acid used.
J. D. Res. December, 1955,849-853
Tuesday, July 07, 2009
Subscribe to:
Posts (Atom)
