ABSTRACT
OBJECTIVES: The objective of this study was to investigate the effects of CO(2) laser on fluoride uptake in the loosely- and firmly-bound forms in enamel. METHODS: Five human molars were cut into halves before being treated with 2.0% NaF topical gel. Each half had three windows on the enamel surface, including one control and two experimental windows irradiated by two laser therapies. One half of each tooth was treated with 1 M KOH solution to remove the loosely-bound fluoride (calcium fluoride). A tooth section was obtained from each window and the relative fluorine concentration was analyzed with Secondary Ion Mass Spectrometry (SIMS). The morphology of the enamel surfaces in the windows was examined using an Environmental Scanning Electron Microscope (ESEM). RESULTS: Significant laser-induced increases in the uptake of fluoride were revealed in both loosely-bound and firmly-bound apatitic fluoride, with both laser treatments (all p<0.001). Calcium fluoride-like deposits on the enamel surfaces receiving the combined laser-fluoride treatment were revealed by ESEM. CONCLUSIONS: The finding of this study substantiated the laser effect in increasing the fluoride uptake into enamel.
Subject(s)
Cariostatic Agents/pharmacokinetics , Dental Enamel/metabolism , Dental Enamel/radiation effects , Fluorides/pharmacokinetics , Lasers , Carbon Dioxide , Humans , Microscopy, Electron, Scanning/methods , Molar , Spectrometry, Mass, Secondary IonABSTRACT
To investigate the effect of Chinese herbs (Astragalus-As,Angelica-An,AG-a composition of Astragalus) on muscle protein metabolism in nephrotic rats. Methods The method of incorporation of [3 H-phenylalanine ] ([3 H-phe]) into the muscle was used. Results (l)The incorporation of [3 H-phe] into the muscle of untreated nephrotic rats (1.12 ? 0.37) was significantly lower than ihe normal control rats (2.25?0.47) ( P
