氟对大鼠股骨生物力学性质改变的影响

目的 观察氟对大鼠股骨生物力学性质改变的影响.方法 30日龄Wistar大鼠50只,体质量90～100 g,按体质量随机分为氟中毒组和对照组,每组25只.氟中毒组饮用含氟(NaF,100 mg/L)的自来水,对照组饮用自来水.饲养期间观察大鼠牙齿生长状态,6个月后处死大鼠,对大鼠股骨进行拉伸强度、冲击韧性、剪切和弯曲强度实验.结果 氟中毒组氟斑牙检出率[92%(23/25)]高于对照组[0(0/25)],组间比较差异有统计学意义(X2=38.97,P<0.01);氟中毒组大鼠总拉伸强度、冲击韧性、剪切和弯曲强度[(225.67±11.81)Mpa、(1.94±0.15)J/mm2、(76.62±6.10)Mpa、(39.96.3±3.90)Mpa]均低于对照组[(244.70±13.38)Mpa、(2.39±0.19)J/mm2、(87.72±7.05)Mpa、(45.75±3.75)Mpa],组间比较差异有统计学意义(t值分别为3.372、5.879、3.756、3.383,P<0.01).结论 氟影响大鼠的骨代谢,氟中毒大鼠股骨生物力学性质发生了改变.

Changes of the femur biomechanics in fluorosis rats

Objective To observe the changes of femur biomechanical properties in fluorosis rats. Methods Fifty Wistar rats of thirty-day old, weighing 90-100 g, were randomly divided according to body mass into fluorosis and control group of 25 each. Fluorosis group drank tap water containing 100 mg/L of fluoride, the control group drank tap water. The rats were observed of dental growing status and killed after feeding 6 months. Their femurs underwent tensile strength, impact, shear, bending experiments. Results The deteetable rate of dental fluorosis was significantly higher in fluorosis group[92%(23/25)] than control group[0(0/25),X2=38.97, P<0.01]. Biomeehanical data in fluorosis group(225.67±11.81,1.94±0.15,76.62±6.10,39.96.3±3.90) were lower than those of the control group(244.70±13.38,2.39±0.19,87.72±7.05,45.75±3.75) in experiments of tensile strength (MPa), impact toughness (J/mm2), shear and bending strength (MPa). The difference was statistically significant(t=3.372,5.879,3.756 and 3383, respectively, P<0.01) between the two groups. Conclusion Fluorides affected bone metabolism in rats, femur biomechanieal properties ehanged in fluorosis rats.