摘要目的:观察氟对大鼠髁突软骨下骨（RCSB）骨微结构生长发育的影响。方法:将42只3周龄SD大鼠（雌雄各半），适应性喂养1周后，处死雌、雄大鼠各3只，记为0个月，根据体重（55 ~ 70 g）按照随机数字表法将剩余大鼠分为对照组（ n = 18）和染氟组（ n = 18），雌雄各半。染氟组饮用含150 mg/L氟化钠（NaF）水溶液，对照组饮用自来水。两组实验动物连续饲养，分别在3、5、7个月后处死，每组6只，雌雄各半。分离截取右侧髁突，进行微计算机断层扫描技术（Micro CT）扫描，检测RCSB骨微结构参数。 结果:3个月染氟组中，雌鼠骨面积密度（BS/TV）、骨表面积和骨体积的比例（BS/BV）、骨小梁厚度（Tb.Th）、骨小梁数目（Tb.N）、结构模式指数（SMI）、连通性、骨小梁连接密度（Conn.D）、总孔隙率，与雄鼠比较差异均有统计学意义（ t = - 5.10、- 5.58、4.52、- 4.32、- 4.03、- 2.81、- 6.71、- 3.32， P均< 0.05）；5、7个月染氟组雌、雄鼠各项指标比较，差异均无统计学意义（ P均> 0.05）。 结论:慢性染氟环境下，雌、雄RCSB骨微结构随时间表现不同，总体呈雌鼠骨变化减缓、雄鼠骨变化活跃的氟损伤倾向。

abstractsObjective:To observe the effect of fluoride on growth and development of bone microstructure of rats condyle subchondral bone (RCSB).Methods:Forty two 3-week-old SD rats (half male and half female) were fed adaptively for 1 week, and 3 females and 3 males were sacrificed and recorded as 0 month. The remaining rats were randomly divided into control group ( n = 18) and fluoride exposed group ( n = 18) according to their body weight (55 - 70 g), half male and half female. The fluoride exposed group was fed with 150 mg/L sodium fluoride (NaF) aqueous solution, and the control group was fed with tap water. The two groups of experimental animals were sacrificed at 3, 5 and 7 month, respectively, 6 rats in each group, half male and half female. The right mandibular condyle was separated, and Micro CT scanning was performed to detect the microstructure parameters of RCSB. Results:In fluoride exposed group (3 month), bone surface/tissue volume (BS/TV), bone surface/bone volume (BS/BV), trabecular thickness (Tb.Th), trabecular number (Tb.N), structure model index (SMI), connectivity, connectivity density (Conn.D) and total porosity of female rats were significantly different from those of male rats ( t = - 5.10, - 5.58, 4.52, - 4.32, - 4.03, - 2.81, - 6.71, - 3.32, P < 0.05). There was no significant difference in each index between female and male rats in fluoride exposed group (5, 7 month, P > 0.05). Conclusion:In chronic fluorine exposure bone environment, the RCSB bone microarchitecture of male and female rats is different with time, showing the tendency of fluoride injury that the bone changes of female rats are slowed and the bone changes of male rats are active.