[Effect caused by uptake of different levels of calcium to enamel fluorosis in rats].
OBJECTIVE
To study the effects caused by uptake of different levels of calcium to dental fluorosis in rats.


METHODS
Weanling rats were raised on water containing 0.1 mol/L fluoride and food containing low, normal and high levels of calcium for 2 months. The concentration of fluoride in enamel was analysed by F-ion-selective electrode. The microradiographic examination and light-density analysis were performed. The enamel structure was examined under SEM.


RESULTS
The more calcium was ingested, the lower level of fluoride amount in enamel was observed (P < 0.01). With increasing food calcium ingestion, the light density value was decreasing, and the level of enamel mineralization was increasing (P < 0.01).


CONCLUSIONS
With increasing food calcium ingestion during the development of teeth, the level of dental fluorosis is decreasing. The calcium supply is effective in protection from fluoride toxicity to a certain extent.
Ouyang
W
W
Research Institute of Stomatology, Beijing Stomatological Hospital, Beijing 100050, China.
Li
Y
Y
Liu
Z
Z
D000818:Animals; D002118:Calcium / Q000008:administration & dosage*; D005459:Fluorides / Q000032:analysis; D009050:Fluorosis, Dental / Q000517:prevention & control*; D008297:Male; D051381:Rats; D017208:Rats, Wistar
D005459:Fluorides; D002118:Calcium