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Mechanical and Histomorphologic Changes of the Rat Femur After Administration of Sodium Fluoride

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Abstract

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-Abstract-
The purposes of the study was to examine changes in thickness and strength of the
rat femur after administration of sodium fluoride in the drinking water. 48 female
Sprague-Dawley rats were randomly divided into 4 groups, an they were supplied with
0(control), 1, 5 and 50 ppm of fluoride in the drinking water ad libitum for 6 weeks.
Rats were killed and both sides of femur were dissected. Bone strength was measured
as the stress of failure of femur at the middle point and femoral neck with Instron.
Histologic slides were prepared from the femur shaft with routine processing of fixing,
demineralizing, embedding and HE staining. Thickness and area of cortical bone and
medullary cavity were measured by using Camera Lucida and Image Analyzer. All the
collected data were analyzed with one-way ANOVA, Duncan's multiple range test for
post-hoc tests and ANCOVA using the SAS 6.12 package at the level of 0.05. Bone
strength increased significantly in the animals given 1 and 5ppm of fluoride in the
water, as compared to the control group. There were significant decreases of stress at
fracture in 50ppmF group compared to the 1 and 5ppmF groups. The similar trends of
bone strength at the femoral neck fracture test, but there were no statistical
significances. Cortical bone thickness and area of the femur increased in the 1 and
5ppmF groups compared to the control. However, the thickness of 50ppmF group also
decreased significantly as compared to 1 and 5 ppmF groups. On the other hand,
medullary thickness and are increased in all fluoride group than control group. All of the
findings presented support the conclusion that, low fluoride dosage used in water
fluoridation could increase the bone strength and might have preventive effect on femur
fracture.

Å°¿öµå

Sodium fluoride; Rat femur; Bone strength; Histomorphologic change;

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