现代口腔医学杂志
現代口腔醫學雜誌
현대구강의학잡지
JOURNAL OF MODERN STOMATOLOGY
2010年
1期
35-38
,共4页
庄丽%孟宪莹%李萍%白玉兴
莊麗%孟憲瑩%李萍%白玉興
장려%맹헌형%리평%백옥흥
正畸%牙根吸收%Micro-CT%形态学
正畸%牙根吸收%Micro-CT%形態學
정기%아근흡수%Micro-CT%형태학
Orthodontic%Root resorption%Micro-CT%Morphological
目的 了解不同的矫治力作用下牙根表面的三维形态学特征变化,探索正畸牙根吸收过程中矫治力值对牙根吸收的影响规律.方法 选择11周龄的SD雄性大鼠22只,分别施加100g和30g近中移动上颌第一磨牙建立实验动物模型,以对侧同名牙作为对照牙.2周后处死动物,获得上颌第一磨牙及其周围牙槽骨.使用Skyscan 1172型Micro-CT扫描大鼠上颌第一磨牙,计算大鼠上颌第一磨牙近中根的表面凹陷体积并进行统计学分析.结果 施加矫治力2周后,重力组与轻力组在牙根表面凹陷总体积上没有显著性差异,但是二者都显著高于对照组.在牙根上段近中面的凹陷体积上,轻力组显著高于重力组和对照组.在牙根下段远中面,重力组显著高于对照组(P＜0.01).结论 施加矫治力后,发生牙根吸收,但是在本实验的研究周期中,力值对牙根吸收的程度无明显影响,对吸收的部位有影响.在重力作用下,牙根吸收主要发生在牙根下段远中面.而在轻力作用下,牙根吸收主要发生在牙根上段近中面.
目的 瞭解不同的矯治力作用下牙根錶麵的三維形態學特徵變化,探索正畸牙根吸收過程中矯治力值對牙根吸收的影響規律.方法 選擇11週齡的SD雄性大鼠22隻,分彆施加100g和30g近中移動上頜第一磨牙建立實驗動物模型,以對側同名牙作為對照牙.2週後處死動物,穫得上頜第一磨牙及其週圍牙槽骨.使用Skyscan 1172型Micro-CT掃描大鼠上頜第一磨牙,計算大鼠上頜第一磨牙近中根的錶麵凹陷體積併進行統計學分析.結果 施加矯治力2週後,重力組與輕力組在牙根錶麵凹陷總體積上沒有顯著性差異,但是二者都顯著高于對照組.在牙根上段近中麵的凹陷體積上,輕力組顯著高于重力組和對照組.在牙根下段遠中麵,重力組顯著高于對照組(P＜0.01).結論 施加矯治力後,髮生牙根吸收,但是在本實驗的研究週期中,力值對牙根吸收的程度無明顯影響,對吸收的部位有影響.在重力作用下,牙根吸收主要髮生在牙根下段遠中麵.而在輕力作用下,牙根吸收主要髮生在牙根上段近中麵.
목적 료해불동적교치력작용하아근표면적삼유형태학특정변화,탐색정기아근흡수과정중교치력치대아근흡수적영향규률.방법 선택11주령적SD웅성대서22지,분별시가100g화30g근중이동상합제일마아건립실험동물모형,이대측동명아작위대조아.2주후처사동물,획득상합제일마아급기주위아조골.사용Skyscan 1172형Micro-CT소묘대서상합제일마아,계산대서상합제일마아근중근적표면요함체적병진행통계학분석.결과 시가교치력2주후,중력조여경력조재아근표면요함총체적상몰유현저성차이,단시이자도현저고우대조조.재아근상단근중면적요함체적상,경력조현저고우중력조화대조조.재아근하단원중면,중력조현저고우대조조(P＜0.01).결론 시가교치력후,발생아근흡수,단시재본실험적연구주기중,력치대아근흡수적정도무명현영향,대흡수적부위유영향.재중력작용하,아근흡수주요발생재아근하단원중면.이재경력작용하,아근흡수주요발생재아근상단근중면.
Objective To analyze the three dimensional morphology of root surface, and try to investigate the effect of the magnitude of force on root resorption during orthodontic tooth movement.Methods The animal model was set up by applying on the upper first molars of 22 SD rats with 100g and 30g forces for 2 weeks. Then the teeth and the alveolar bone around teeth were scanned, and calculated, the volume of the mesial root of maximal first molars was analysed.Results When the teeth were applied force for 2 weeks, the whole resorption volume of experimental groups increased significantly than that of the control group, the resorption volume on the lower distal surface of 100g group increased significantly than that of the control group, and the volume on the upper mesial root surface increased significantly than that of the control group. (P＜0.01), while there was no significant difference between the 30g group and 100g group.Conclusion Force can result in root resorption. And the magnitude of force was not related to the extent of root resorption during 2 weeks, but it was related to the position of root resorption. When the teeth were applied 100g force, the root resorption was observed on distal surfaces of lower part, while that was observed on the upper mesial surfaces of roots with 30g force.
