A new method to evaluate the positional stability of a self-drilling miniscrew
A new method to evaluate the positional stability of a self-drilling miniscrew
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DOI：
10.1111/ocr.12065
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发表时间：
2015-08-01
影响因子：
3.1
通讯作者：
Xu, T. M.
中科院分区：
文献类型：
--
作者：
Chen, G.;Chen, S.;Xu, T. M.
目的评价锥形束ct （cone-beam computed tomography， CBCT）在正畸治疗变化过程中微型支架的位置稳定性。设置和样本人群20名成人志愿者被招募。方法所有患者均至少有2颗上颌第一前磨牙因前突而拔除。每个志愿者在上颌骨上都安装了6个微型支架，包括2个已加载的微型支架，用于收缩前牙，还有4个未加载的微型支架。CBCT扫描在间隙关闭开始时（T1）和大约11.8个月后（T2）进行。在T1和T2建立三维微型模型，利用主成分分析（PCA）技术计算中心轴。最后，我们测量并比较了所有微型螺钉从T1到T2的角度变化。结果卸载和加载微型螺钉的角度变化值分别为1.641.25°和1.67 +/- 1.15°。角度变化无明显差异。结论锥形束计算机断层扫描显示，在本研究中，卸载和加载的微型螺钉在大规模内收时位置稳定。
Structured AbstractObjectivesTo evaluate the positional stability of miniscrews during orthodontic treatment change in cone-beam computed tomography (CBCT).Setting and Sample PopulationTwenty adult volunteers were enrolled.MethodsIn all participants, at least two maxillary first premolars were extracted because of protrusion. Each volunteer received six miniscrews in the maxilla, including two loaded miniscrews to retract anterior teeth and four unloaded miniscrews. CBCT scans were obtained at the beginning of space closure (T1) and approximately 11.8months later (T2). Three-dimensional miniscrew models were constructed at T1 and T2, and the central axes were calculated using a principal component analysis (PCA) technique. Finally, we measured and compared the angle change of all the miniscrews from T1 to T2.ResultsThe angle change values of the unloaded and loaded miniscrews were 1.641.25 degrees and 1.67 +/- 1.15 degrees, respectively. No significant differences in the angle change were observed.ConclusionCone-beam computed tomography images revealed both the unloaded and loaded miniscrews to be positionally stable during en-masse retraction in this study.