Measurements of the diffusion coefficient of NaF in human dental plaque in vitro
1980; Elsevier BV; Volume: 25; Issue: 11-12 Linguagem: Inglês
10.1016/0003-9969(80)90140-5
ISSN1879-1506
AutoresS.G. McNee, D.A.M. Geddes, C. Main, F.C. Gillespie,
Tópico(s)Endodontics and Root Canal Treatments
ResumoUsing a new technique, the diffusion coefficient, D, of NaF in plaque at 37 °C was measured by monitoring its clearance from a thin layer of plaque. D, for both the sodium and the fluoride ions, was 4.2 × 10−6cm2s-t1, which is about one quarter of the diffusion coefficient of NaF in water at 37 °C. No significant change in D was found over the physiological pH range of plaque. It is concluded that fluoride diffuses rapidly in plaque, with a halving-time T12, of 6.7s for a 100 μm layer of plaque. This suggests that a thorough cleaning and polishing of the teeth may not be essential before topical application of fluoride.
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