KRISZTINA MÁRTHA, ALEXANDRU OGODESCU, IRINA ZETU, EMILIA OGODESCU, MARIANA PACURAR<br>The Effect of Phosphoric Acid Etching Application Time <br>on the Enamel Morphology - a Comparative SEM Study

KRISZTINA MÁRTHA, ALEXANDRU OGODESCU, IRINA ZETU, EMILIA OGODESCU, MARIANA PACURAR
The Effect of Phosphoric Acid Etching Application Time
on the Enamel Morphology - a Comparative SEM Study

Abstract:

Our objective was to evaluate the etching pattern and the depth of demineralization during enamel etching with phosphoric acid applied on un-instrumented enamel surfaces in different time duration. 40 human premolars extracted for orthodontic reason were divided in four groups and after preparing them for conditioning, were treated with 37% phosphoric acid for 15, 30 and 45 s. The fourth group was the control group. All teeth were analyzed with scanning electron microscopy. Control teeth showed transversally oriented, superimposed prisms and small, polygonal or round holes where the prisms were perpendicular to the examined surface. When etching was made for 15 s, a sponge-like moderate demineralization can be seen which affect mostly the interprism spaces. In the case of a longer acid treatment (30 s) the demineralization was greater at the prism head and at the periphery, demineralization of interprismatic areas can also be seen. When we etched for 45 s, we observed that both inter- and intraprismatic areas were affected, the head of prisms were almost completely razed. Our results showed different micro morphological changes depending on the time duration of acid treatment. Key words: enamel etching, phosphoric acid, SEM, time duration

Issue: 2013, Volume 64, Issue 9

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