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作 者:刘颍凤[1] 王小竟[1] 王庆昱[1] 张晓[1] 王军[2]
机构地区:[1]第四军医大学口腔医学院儿童口腔科,陕西西安710032 [2]第四军医大学西京医院骨科
出 处:《中华口腔医学杂志》2009年第6期355-359,共5页Chinese Journal of Stomatology
基 金:国家自然科学基金(30572045)
摘 要:目的建立牙周炎大鼠的牙槽骨三维模型,采用显微cT观察尼古丁对大鼠牙槽骨的影响。方法36只SD大鼠,丝线结扎上颌右侧(实验侧)第二磨牙颈部,左侧不予结扎,作为自身对照(对照侧),使用完全随机分组方法分为对照组(A)及尼古丁注射低剂量(B)和高剂量(C)组,每组12只。分别给予生理盐水和尼古丁0.83、1.67mg·kg^-1·d^-1腹腔注射。每组分别于给药后第14、28天各处死6只,取双侧上颌磨牙区牙体牙周复合组织,行显微CT扫描、重建、测量和分析。结果随尼古丁给药剂量增加,双侧牙槽骨骨密度、骨体积分数、骨小梁厚度逐渐降低,牙槽骨高度丧失与骨小梁间隙逐渐升高。28d时C组牙槽骨高度丧失[对照侧和实验侧分别为(0.61±0.14)、(1.39±0.09)mm]显著高于B组[对照侧和实验侧分别为(0.39±0.10)、(1.31±0.06)mm]和A组[对照侧和实验侧分别为(0.30±0.06)、(0.94±0.07)mm];C组牙槽骨骨密度[对照侧和实验侧分别为(617.86±34.27)、(572.46±31.62)mg/cm^3]显著低于B组[对照侧和实验侧分别为(660.04±36.73)、(604.97±32.59)mg/cm^3]和A组[对照侧和实验侧分别为(709.15±34.95)、(657.04±30.06)mg/cm^3]。结论尼古丁可加重丝线结扎造成的大鼠牙槽骨骨量丧失和骨质微观结构的变化,导致牙槽骨骨质疏松。Objective To establish the three-dimensional images of rat's alveolar bone and to evaluate the effects of nicotine on alveolar bone loss during the process of hgature-induced periodontitis with micro-computed tomography (micro-CT). Methods Thirty-six adult male SD rats received silk ligatures around the cervixes of the fight second maxillary molars. Then the animals were randomly assigned to three groups and received daily intraperitoneal injections as follows: group A (control), saline solution; group B, nicotine, 0.83mg·kg^-1·d^-1; and group C, nicotine, 1.67mg·kg^-1·d^-1. Six animals in each group were randomly selected and sacrificed at day 14 and 28. Micro-CT examinations were used to evaluate the periodontal breakdown. Results With the nicotine dose increased, bone mineral density (BMD), bone volume fraction (BVF), and trabecular thickness(TT) gradually reduced, while the trabecular spacing (TS) and alveolar bone loss (ABL) increased. At day 28, the ABL of group C (left, fight) was (0.61±0. 14)mm and (1.39±0.09) mm, and significantly higher than that of group B [(0.39±0.10) mm and (1.31±0.06) mm] and group A [(0.30±0.06) mm and (0.94±0.07) mm]. The BMD of group C, group B and group A at day 28 was [(617.86±34.27), (572.46±31.62) mg/cm^3], [(660.04±36.73), (604.97±32.59)mg/cm^3] and [(709.15±34.95), ( 657.04±30.06) mg/cm^3] respectively. Conclusions Daily administration of nicotine results in significant bone loss and mierostructure deteriorations in the trabeculae of alveolar bone.
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