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• W2087968275 abstract "In-vitro uptake of F by intact enamel from 0.62 M solutions of NH4F was greater than that from NaF at low pH, but similar at nearly neutral or alkaline pH. Fluoride contents in enamel biopsies taken 2 weeks after a 3 min topical treatment with the acid solutions also were higher for the NH4F treatment. The in-vitro and in-vivo uptake from both solutions was enhanced by pretreating the enamel for one minute with 0.05 M phosphoric acid. Examination by the electron microscope of the F-exposed enamel before and after washing revealed the deposit formed from NH4F was retained more tenaciously than that formed from NaF. X-ray diffraction patterns showed formation of CaF2 when ground enamel was treated with either of the two acid fluoride solutions. L'absorption de F in vitro par de l'émail intact à partir de solutions 0,62 M de NH4F est plus élevée que celle de NaF à pH bas, mais est identique à des pH neutre et alcalins. Les contenus en fluorure de biopsies d'émail, prélevées 2 semaines après un traitement local de 3 min avec des solutions acides, sont plus élevés pour un traitement au NH4F. L'absorption in vitro et in vivo des deux solutions est augmentée par un prétraitement de l'émail pendant 1 min avec 0,05 M d'acide phosphorique. L'examen au microscope électronique de l'émail exposé au F—, avant et après lavage, montre que le dépot formé à partir de NH4F est plus adhérent que celui obtenu par NaF. Des clichés de diffraction par rayons X démontrent la formation de Ca F2, lorsque de l'émail en poudre est traité par l'une ou l'autre solution fluorée acide. Die in vitro-Fluoraufnahme durch intakten Schmelz aus 0,62 M Lösungen von NH4F war gröβer als die aus NaF-Lösungen bei niedrigem pH und ähnlich bei nahezu neutralem oder alkalischem pH. Der Fluoridgehalt in Schmelzbiopsien, die 2 Wochen nach einer 3 min dauernden Oberflächenbehandlung mit sauren Lösungen gewonnen worden waren, fand sich nach der NH4F-Behandlung erhöht. Die in vitro- und in vivo-Aufnahme aus beiden Lösungen wurde gesteigert, wenn der Schmelz 1 min lang mit 0,05 M Phosphorsäure vorbehandelt wurde. Die elektronenmikroskopische Untersuchung des F-behandelten Schmelzes vor und nach dem Waschen ergab, daβ die aus NH4F gebildete Ablagerung besser retiniert wurde als die aus NaF gebildete. Röntgendiffraktionsuntersuchungen ergaben die Bildung von CaF2, wenn Schmelzpulver mit einer der beiden sauren Fluoridlösungen behandelt worden war." @default.
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• W2087968275 date "1971-10-01" @default.
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• W2087968275 title "Response of human enamel to topical application of ammonium fluoride" @default.
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• W2087968275 doi "https://doi.org/10.1016/0003-9969(71)90046-x" @default.
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