J. M. Birkeland

The Effect of pH on the Interaction of Fluoride and Salivary Ions

The interaction between fluoride and some plaque components has indicated that fluoride binds to norganic salivary substances which are ultrafiltrable. The ffect of pH on the affinity of fluoride to t

Direct Potentiometric Determination of Fluoride in Soft Tooth Deposits

A method using an Orion combination electrode (96–09) was developed for determining the total fluoride content of soft tooth deposits. The samples were collected by plastic sealers and dried at 105° C

The Influence of Fluoride Rinses on the Fluoride Content of Dental Plaque in Children

One sample of soft deposit was taken from each of 143 11 to 13-year-old children performing weekly mouth rinses with 10 ml 0.2% NaF or 0.2% NaCl. F was determined, and the ppm F calculated on the dry

Effect of fluoride on the saturation of an acetate buffer with respect to hydroxyapatite

Synthetic hydroxyapatite and powdered enamel were equilibrated with a pH 5.0 buffer for one or two weeks at 20 °C. When the liquid approached saturation with respect to hydroxyapatite, the fluoride ion activity was adjusted to 0.1, 0.5 or 1.0 parts/106 which made the liquid highly supersaturated with respect to fluorapatite. A rapid formation of a fluorapatite occurred, which made the liquid unsaturated with respect to hydroxyapatite. After further equilibration, the liquid once more approached saturation with respect to hydroxyapatite.

The Pharmacokinetics of Fluoride in Mouth Rinses as Indicated by a Reference Substance (51Cr-EDTA)

Mouth rinses with 7 ml 0.05% NaF containing 51Cr-EDTA (2 μCi) were performed by 11 dental staff members. The water-soluble non-absorbable 51Cr-EDTA was added to enable estimation

Intra- and Interindividual Observations on Fluoride Ion Activity and Retained Fluoride with Sodium Fluoride Mouth Rinses

2-min mouth rinses with 7 and 10 ml 0.05% NaF were carried out by 9 adults and 24 children (10–11 years old). Each person rinsed 5 times with , fluoride each volume. The oral expectorate with the rins

Fluorosis of deciduous teeth and first permanent molars in a rural Kenyan community

The severity and distribution of fluorosis in the deciduous dentition of 76 children in a low-income community near Nairobi were studied. Seventeen children comprised a low-F (fluoride) group (water less than 0.7 ppm F) and 59 a high-F group (water approximately 9 ppm F). The high-F group had scores greater than or equal to 5 in the Thylstrup & Fejerskov classification system for 29% of the deciduous tooth surfaces, compared with 7% in the low-F group. Comparison between the scores of the second deciduous and the first permanent molars showed no significant difference in the high-F group (p greater than 0.001), whereas the deciduous molar was significantly less severely affected in the low-F group (p less than 0.001). The deciduous molars of the two groups differed significantly (p less than 0.002), but not the permanent molars (p greater than 0.10). Early introduction of tea might have been a major contributor to the distributions of fluorosis, particularly in the low-F group.

In vitro study on the mechanisms of action of fluoride in low concentrations.

The mechanisms of action of fluoride ions in saliva-sucrose solutions were studied when half crowns of premolars were employed in an in vitro system. The fluoride ion concentration

Fluoride Ion Activity in vitro and in vivo of Two Sodium Fluoride Dentifrices

The fluoride ion activities of two NaF dentrifrices have been determined in undiluted samples, in samples diluted in 6 ml water or saliva, and in saliva-dentifrice slurries after 2 min brushing. The a