【摘要】 目的:探讨全身给予辛伐他汀对大鼠正畸牙齿移动后保持阶段骨形成生化指标和骨密度的影响。方法:选用40只雄性Wistar大鼠,随机分成5组:基本对照组、阴性对照组(生理盐水)、低剂量组(2.5mg/kg)、中剂量组(5.0mg/kg)、高剂量组(10.0mg/kg),牵引其上颌第一磨牙向近中移动。实验组在加力装置去除前1d开始,腹膜下注射辛伐他汀;阴性对照组注射生理盐水,1次/d。4周后处死大鼠,取血,检测血清骨钙素(BGP)、碱性磷酸酶(ALP)、钙(Ca)、磷(P),测定上颌第一磨牙区牙槽骨密度(BMD)等。结果:实验组BGP、ALP水平较阴性对照组明显升高(P<0.05),低剂量组升高最明显,随剂量增加,BGP、ALP水平减低;实验组与对照组血清Ca、P无明显差别(P>0.05)。上颌第一磨牙区牙槽骨BMD对照组明显高于其它各组(P<0.05);实验组与阴性对照组比较,低剂量组最高,差异有显著性(P<0.05)。结论:辛伐他汀全身给药能够有效地促进局部牙槽骨骨合成代谢,最适有效剂量为2.5mg/kg。更多还原

【Abstract】 Objective:To investigate the effect of of simvastatin on bone formation and bone mineral density(BMD) during the retention after orthodontic tooth movement. Methods:Orthodontic tooth movement of upper first molar was performed in 40 rats with coil spring for 21 days. 40 rats were randomly allocated into 5 groups: basic control group,negative control group and 3 simvastatin groups(2.5 mg·kg-1, 5.0 mg·kg-1 and 10.0 mg·kg-1respectively).Rats in basic control group were killed when appliances were removed after 21 days.The experimental groups were administered simvastatin daily from 1 day before appliances removed for 4 weeks.The negative control group received the isotonic saline as control.4 weeks later all animals were anesthetized and killed. Level of serum Ca and P in blood, ALP, BGP and BMD were monitored.Results:①Between experimental groups and the negative control group, in amounts of ALP and BGP,the anterior were higher than the posterior (P<0.05).The more dosage,the less amount of ALP and BGP. The amounts of ALP and BGP were the highest in the low-dose group; there were no obvious differences among all groups in amounts of Ca and P(P>0.05). ②The alveolar near the maxillary first molar,BMD of the basic control group was the highest(P<0.05);compared the experimental groups with the negative group,BMD of the lowest group was the highest one.Conclusion: Simvastatin can improve the local alveolar bone formation,and the optimum dose is 2.5 mg·kg-1.更多还原