Three-dimensional cone-beam computed tomography for assessment of mandibular changes after orthognathic surgery
Three-dimensional cone-beam computed tomography for assessment of mandibular changes after orthognathic surgery
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DOI：
10.1016/j.ajodo.2005.03.029
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发表时间：
2007-01-01
影响因子：
3
通讯作者：
Turvey, Timothy
中科院分区：
文献类型：
--
作者：
Cevidanes, Lucia H. S.;Bailey, L'Tanya J.;Turvey, Timothy
简介：本研究的目的是评估接受上颌前移和下颌后退或仅接受上颌手术的患者的下颌支和髁突的三维（3D）位置的改变。方法：对21例正颌手术前后患者进行高分辨率锥形束CT扫描。10例各种错牙合患者仅接受上颌手术，11例III类患者接受上颌前移和下颌后退。手术前和手术后的3D模型在颅底表面上注册。使用一种新工具进行图形叠加和3D显示（彩色图），以直观评估位置并量化叠加模型之间下颌支和髁突后缘的位置变化。结果如下：双颌和单颌手术的髁突位置的平均位移较小-分别为0.77 mm（SD，0.12 mm）和0.70 mm（SD，0.08 mm）（无显著性，P > 0.05）。所有双颌手术患者的下颌支向后旋转移位（平均值，1.98 mm; SD，1.03 mm），11例受试者中有8例的最大表面距离变化>= 2 mm。对于单颌手术，所有受试者的下颌支都有小的向后旋转位移（平均值，0.78 mm; SD，0.25 mm），只有1名受试者的最大表面距离变化>= 2 mm。
Introduction: The purpose of this study was to assess alterations in the 3-dimensional (3D) position of the mandibular rami and condyles in patients receiving either maxillary advancement and mandibular setback or maxillary surgery only. Methods: High-resolution cone-beam computed tomography scans were taken of 21 patients before and after orthognathic surgery. Ten patients with various malocclusions underwent maxillary surgery only, and 11 Class III patients received maxillary advancement and mandibular setback. Presurgery and postsurgery 3D models were registered on the surface of the cranial base. A new tool was used for graphical overlay and 3D display with color maps to visually assess the locations and to quantify positional changes in the posterior border of the mandibular rami and condyles between superimposed models. Results: The average displacements in condylar position were small-0.77 mm (SD, 0.12 mm) and 0.70 mm (SD, 0.08 mm)-for 2-jaw and 1 -jaw surgeries, respectively (not significant, P >.05). All 2-jaw surgery patients had backward rotational displacements of the mandibular rami (mean, 1.98 mm; SD, 1.03 mm), with a maximum surface distance change of >= 2 mm in 8 of 11 subjects. For the 1-jaw surgery, all subjects had small backward rotational displacements of the mandibular rami (mean, 0.78 mm; SD, 0.25 mm), with only 1 subject having a maximum surface distance change >= 2 mm. The difference in mean backward rotational displacement was statistically significant (P