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Quintessence Publishing: Journals: QI
Quintessence International

Edited by Eli Eliav

ISSN 0033-6572 (print) • ISSN 1936-7163 (online)

Publication:
April 1995
Volume 26 , Issue 4

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Microscopic appearance of enamel white-spot lesions after acid etching

Lee/Shey/Cobb

Pages: 279-284
PMID: 7568748

Ultrastructural changes in surface characteristics of enamel white-spot lesions were compared with changes in the adjacent clinically cound enamel after they were etched with 30% phosphoric acid. Ten human permanent first molars exhibiting natural white-spot lesions were used as study specimens. The lesion surfaces and their adjacent sound enamel were etched with 30% phosphoric acid for 60 seconds. Specimens were then evaluated by polarized light microscopy, scanning electron microscopy, and energy-dispersive spectroscopy. The acid etching produced a porous surface on both the white-spot lesion and the surrounding sound enamel. However, the lesion surface appeared to be more resistant to acid and dissolved less than adjacent enamel. This difference in acid solubility produced a steplike appearance between a white-spot lesion and its adjacent enamel surface. Energy-dispersive spectroscopy demonstrated no difference in relative calcium-phosphorus rations among the acid-etched white-spot lesion, acid-etched sound enamel, and unetched sound enamel.

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