CAJ | 학술논문

目的应用口腔锥形束CT(cone-beam computed tomography, CBCT)对减阻牵张快速牙移动的效果进行分析、评价。方法 Beagle犬10只，雌、雄各半，在下颌左右随机选取一侧为对照侧（常规加力侧，力值约85 g），另一侧为实验侧(减阻-牵张侧)。分别于加力5、10、15 d及加力15 d保持固定10 d、90 d时拍摄CBCT影像。利用CBCT影像及Ez3D2009图形分析软件观察移动牙移动距离、倾斜程度、压力侧牙槽骨密度和牙根吸收情况。结果（1）采用CBCT测量牙齿移动距离结果与直接口内牙齿移动距离测量结果无显著差异（P>0.05）；（2）实验侧移动牙发生倾斜程度略大于对照侧（P<0.05）；（3）实验侧移动牙牙根未发生广泛吸收，其压力侧牙槽骨密度伴随牙齿移动呈逐渐增高趋势，且新生骨密度、影像学特征与对照侧牙槽骨无显著差异。结论CBCT三维成像技术能够弥补二维影像重叠、变形等不足，尤其在减阻牵张过程中牙齿倾斜度、牙槽骨密度测量方面更具优势，具有无创性及可重复性。
목적응용구강추형속CT(cone-beam computed tomography, CBCT)대감조견장쾌속아이동적효과진행분석、평개。방법 Beagle견10지，자、웅각반，재하합좌우수궤선취일측위대조측（상규가력측，력치약85 g），령일측위실험측(감조-견장측)。분별우가력5、10、15 d급가력15 d보지고정10 d、90 d시박섭CBCT영상。이용CBCT영상급Ez3D2009도형분석연건관찰이동아이동거리、경사정도、압력측아조골밀도화아근흡수정황。결과（1）채용CBCT측량아치이동거리결과여직접구내아치이동거리측량결과무현저차이（P>0.05）；（2）실험측이동아발생경사정도략대우대조측（P<0.05）；（3）실험측이동아아근미발생엄범흡수，기압력측아조골밀도반수아치이동정축점증고추세，차신생골밀도、영상학특정여대조측아조골무현저차이。결론CBCT삼유성상기술능구미보이유영상중첩、변형등불족，우기재감조견장과정중아치경사도、아조골밀도측량방면경구우세，구유무창성급가중복성。
Objective To evaluate the effect of rapid teeth movement through reducing resistance and distraction using cone-beam computed tomography (CBCT). Methods The left or right side of the mandible of 10 beagles (5 males and 5 females) was randomly selected as the control side (for the conventional distraction with a force of about 85 g) and the other side as the experimental side (subjected to reducing resistance and distraction). CBCT images were taken at 5, 10, and 15 days and also after retaining for 10 and 90 days after distraction for 15 days. The distance of teeth transportation, degree of inclination, alveolar bone density of the compressive area and root resorption were evaluated based on the CBCT images and Ez3D2009 visualization software. Results No significant difference was found between CBCT-based measurement and direct measurement of teeth transportation distance within the mouths (P>0.05). Teeth inclination on the experimental side was slightly greater than that on the control side (P<0.05). The root resorption on the experimental side was minimal, and the bone density increased gradually along with the teeth migration. The experimental side showed a comparable newly formed alveolar bone density and similar X-ray features of the compressive area with the control side. Conclusions CBCT three-dimensional imaging can resolve the problems of overlapping and deformation of the two-dimensional images and is especially useful for measurement of teeth inclination and alveolar bone density in the process of reducing resistance and distraction.