Influence of repeated APF applications on long-term remineralization of initial lesions in bovine enamel.
Initial lesions in bovine enamel were remineralized in vitro for periods lasting from one hour to two weeks; in some cases, remineralization was interrupted daily for a ten-minute APF application. After two weeks, surface coatings appeared on APF-treated specimens; SEM and TEM observations, including selected area and micro-electron diffraction, indicated both a layered structure within these coatings, and the predominance of calcium fluoride single crystals, ranging from 0.1 to 1.0 micrometer in size. Using double (45 Ca and 32 P) labeled remineralizing solutions, we obtained depth profiles of deposited labeled calcium and phosphate; these indicated that repeated APF applications prevented inward penetration of calcium and phosphate and limited the deposition of these ions to an outer surface region corresponding to the surface coating. These phenomena are explained in terms of the composition and apparent reactivity of the coating.
D000149:Acidulated Phosphate Fluoride / Q000008:administration & dosage / Q000494:pharmacology*; D000818:Animals; D002122:Calcium Chloride / Q000494:pharmacology; D002132:Calcium Radioisotopes; D002417:Cattle; D003461:Crystallography; D003731:Dental Caries / Q000473:pathology / Q000503:physiopathology*; D003743:Dental Enamel / Q000648:ultrastructure; D008852:Microradiography; D008855:Microscopy, Electron, Scanning; D010710:Phosphates / Q000494:pharmacology; D010761:Phosphorus Radioisotopes; D011188:Potassium / Q000494:pharmacology; D017680:Potassium Compounds; D012969:Sodium Fluoride / Q000031:analogs & derivatives*; D013997:Time Factors; D014089:Tooth Remineralization
D002132:Calcium Radioisotopes; D010710:Phosphates; D010761:Phosphorus Radioisotopes; D017680:Potassium Compounds; D000149:Acidulated Phosphate Fluoride; D012969:Sodium Fluoride; C013216:potassium phosphate; D002122:Calcium Chloride; D011188:Potassium