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Biomedical subjects

F Barbakow

Publications and source records attributed to F Barbakow.

At least 73 records · Page 4Linked to original sources
PubMed1983

Periodontal pocket measurements with a modified Plast-o-Probe and a metal probe.

Two types of periodontal probes used to measure pocket depths, i.e. a modified Plast-o-Probe (PoP) and a metal probe (MP), were compared. Periodontal pocket depths in 5 volunteers were determined by 5 clinically trained investigators using each of the probes. The average periodontal pocket depth was found to be the same for both probes and was independent of the degree of gingival inflammation and the localisation of probing. The results obtained by 1 of the 5 investigators were influenced by the type of probe. 4 investigators found that PoP permitted a 2.8-11.0% greater degree of reproducibility while MP exhibited a 0.9-12.2% higher inter-investigator agreement. In vivo and in vitro radiological and histometrical analysis on another group of patients showed a similar degree of penetration into the connective tissue zones with both probes. The investigators considered PoP a precise instrument but suggested that its readability should be improved for routine clinical use.

Adult↗
PubMed1975

Histochemically demonstrable changes in amylase activity in submaxillary salivary glands of puberal male mice following castration.

The sexual dimorphism in mouse submaxillary glands is well documented. The main difference is seen in the granular convoluted tubules (G.C.T.) which in the adult male are large and in the adult female are small and fewer. Previous studies have shown that amylase is localized histochemically to these G.C.T.'s; that following castration there is a histological reduction in size and number of the G.C.T.'s and a roughly 50 per cent decrease in amylase activity demonstrable biochemically. In the present study 74 male mice aged 60 days were divided in six groups. The animals were fasted overnight. Under general anaesthesia, the submaxillary glands on the left side were removed and frozen in liquid nitrogen for subsequent histochemistry. The animals were then castrated and returned to their cages. At periods of 2, 4, 6, 8, 10 and 12 weeks later, the other submaxillary gland was removed under the same conditions, and the animals were then killed. Fresh frozen cryostat sections of both glands were subjected to the starch substrate film technique for the histochemical demonstration of amylase. Adjacent sections were stained with HE. The 2-week animals showed a slight but define reduction in size and number of G.C.T.'s and a parallel reduction in amylase activity. This was more pronounced by 4 and 6 weeks. In the 4-week animals, however, the changes were not consistent, being more pronounced in some animals than in others. This same phenomenon was observed in the 6-, 8- and 10-week animals, in some of whom there was considerable G.C.T. atrophy in the submaxillaries and in others very much less. In many of the 12-week animals there was very little evidence of G.C.T. atrophy. These findings confirmed other studies which suggested that there may be some regeneration of G.C.T's, possibly as a result of influence of other endocrine glands such as thyroid, adrenal and pituitary.

Amylases↗
PubMedDate not supplied

Fluoride retention by human enamel after in vitro application of nicomethanol hydrofluoride.

Fluoridated dentifrices generally contain sodium monofluorophosphate or sodium fluoride--alone or in combination--or a group of organic fluorides, the amine fluorides. The purpose of this study was to determine the fluoride and retention in vitro by human enamel, after brushing with a dentifrice containing the amine fluoride, nicomethanol hydrofluoride, the fluoride salt of nicotinyl alcohol.

Administration, Topical↗
PubMedDate not supplied

Observations of SnF2-treated human enamel using scanning electron microscope.

Human enamel was ground flat, treated for 4 min with 8 percent SnF2 and then immersed in water for 5 sec, 5 min, 60 min and 24 h. Products formed on the enamel included round globular and triangular-shaped crystalline structures which were removed after the treated enamel specimens were immersed in water for 24 h. In contrast, the non-water-washed treated enamel specimens had a distinct precipitate.

Dental Enamel↗
PubMedDate not supplied

In vitro dissolution of human enamel after application of a mixture of stannous fluoride and amine fluoride 297: a pilot study.

Human enamel specimens were topically treated in vitro, using either a clear, aged aqueous mixture consisting of SnF2 and amine fluoride 297, or SnF2 alone, amine fluoride 297 alone, NaF, or water (as the negative control). The fluoride concentrations used were 250 ppm F1/n. The topically treated enamel specimens were then acid-etched for 5, 10, 15, and 15 seconds, respectively, in 2NHC1. The amount of phosphorous dissolved from the enamel and the depth of etch were both significantly less for the groups treated with SnF2/AmF297 and SnF2 alone, which indicated better protection against acid dissolution than the other three groups.

Acid Etching, Dental↗