Effect of acid-etching on fluoride-treated caries-like lesions of enamel: a SEM study.

Abstract	Etching patterns by 20 percent phosphoric acid on caries-like lesions of enamel (white spot) untreated and treated with 0.4 APF were studied at 30, 60, 120 seconds of etch-times using the Scanning Electron Microscope (SEM). The surface topography of acid-etched teeth varied according to the etch time. Acid etching of caries-like lesions treated with fluoride showed etching patterns similar to sound enamel. Based on Silverstone's classification, thirty seconds etch-time produced type III pattern of surface morphology, while type I and type II were observed with 60 and 120 seconds of etch time. Fluoride treated lesions showed increased porosity and in addition to a surface coating of numerous small globules of calcium fluoride. Low level of topical fluoride before sealant application should be beneficial, since this allows a more rapid rate and increased degree of remineralization and possible arrest in the progress of caries lesions.
Authors	S Tandon, T A Mathew
Journal	ASDC journal of dentistry for children (ASDC J Dent Child) Vol. 64 Issue 5 Pg. 344-8 ( 1997) ISSN: 1945-1954 [Print] United States
PMID	9391712 (Publication Type: Journal Article)
Chemical References	Cariostatic Agents Fluorides, Topical Phosphoric Acids Pit and Fissure Sealants Acidulated Phosphate Fluoride Calcium Fluoride
Topics	Acid Etching, Dental Acidulated Phosphate Fluoride (administration & dosage, therapeutic use) Adolescent Calcium Fluoride (chemistry) Cariostatic Agents (administration & dosage, therapeutic use) Child Dental Caries (drug therapy, pathology, physiopathology) Dental Enamel (drug effects, ultrastructure) Dental Enamel Solubility (drug effects) Fluorides, Topical (administration & dosage, therapeutic use) Humans Microscopy, Electron, Scanning Phosphoric Acids (administration & dosage, pharmacology) Pit and Fissure Sealants (therapeutic use) Porosity Time Factors Tooth Remineralization

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