Cevidanes Lucia H S, Alhadidi Abeer, Paniagua Beatriz, Styner Martin, Ludlow John, Mol Andre, Turvey Timothy, Proffit William R, Rossouw Paul Emile
Department of Orthodontics, School of Dentistry, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2011 Jun;111(6):757-70. doi: 10.1016/j.tripleo.2011.02.002. Epub 2011 Apr 16.
The aim of this study was to determine if 3-dimensional (3D) shape analysis precisely diagnoses right and left differences in asymmetry patients.
Cone-beam computerized tomography (CT) data were acquired before treatment from 20 patients with mandibular asymmetry. 3D shape analysis was used to localize and quantify the extent of virtually simulated asymmetry. Two approaches were used: 1) mirroring on the midsagittal plane determined from landmarks; and 2) mirroring on an arbitrary plane and then registering on the cranial base of the original image. The validation presented in this study used simulated data and was applied to 3 clinical cases.
For mirroring on the midsagittal plane, there was a >99% probability that the difference between measured and simulated asymmetry was <0.5 mm. For mirroring with cranial base registration, there was a >84% probability of differences <0.5 mm.
Mandibular asymmetry can be precisely quantified with both mirroring methods. Cranial base registration has the potential to be used for patients with trauma situations or when key landmarks are unreliable or absent.
本研究旨在确定三维（3D）形状分析能否精确诊断不对称患者的左右差异。
在治疗前从20名下颌不对称患者获取锥束计算机断层扫描（CT）数据。使用3D形状分析来定位和量化虚拟模拟不对称的程度。采用了两种方法：1）在由地标确定的正中矢状面上进行镜像；2）在任意平面上进行镜像，然后在原始图像的颅底上进行配准。本研究中呈现的验证使用了模拟数据，并应用于3个临床病例。
对于在正中矢状面上进行镜像，测量的不对称与模拟的不对称之间差异<0.5毫米的概率>99%。对于进行颅底配准的镜像，差异<0.5毫米的概率>84%。
两种镜像方法均可精确量化下颌不对称。颅底配准有可能用于创伤情况的患者或关键地标不可靠或不存在的情况。
