Etude semi-quantitative in vitro du mordançage de l’émail humain: observations au microscope électronique à balayage

J Rodde

Abstract


The efficiency of etching using lactic, citric, hydrochloric and phophoric acids has been studied with the scanning electron microscope on 557 human enamel surfaces. A semi-quantitative assessment has been performed with reference to Silverstone et al.’s classification (1975) as regards the demineralization stages of enamel prisms and to Sheykholeslam and Buonocuore’s 6 points scale as regards the etching degrees.

Lactic and citric acids proved ineffective. Hydrochloric and phosphoric acids were efficient between 20 and 50% concentrations. A 1 minute etching seems optimal. A long-continued etching induces crackling of the surface enamel layer into patches which do not stick properly to the underlying enamel. Only the removal of the hypermineralized surface layer (using a diamond wheel) allows to obtain microporosities evenly distributed all over the sample surface. A mechanical teatment of enamel surfaces prior to etching is necessary especially when temporary teeth or «mature» (between 5 and 50) or «aged» (over 50) teeth are concerned.


Keywords


etching; human enamel; lactic acid; citric acid; hydrochloric acid; phosphoric acid; SEM.

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