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中华口腔医学研究杂志(电子版) ›› 2012, Vol. 6 ›› Issue (03) : 285 -290. doi: 10.3877/cma.j.issn.1674-1366.2012.03.013

临床研究

锥形束CT 与X 线头颅侧位定位片评价骨性Ⅲ类错 的比较
邝炜平1, 蔡斌1, 冯志才1, 何旭顺1, 王大为1,()   
  1. 1.510055 广州,中山大学光华口腔医学院·附属口腔医院,广东省口腔医学重点实验室
  • 收稿日期:2011-03-01 出版日期:2012-06-01
  • 通信作者: 王大为
  • 基金资助:
    广东省科技计划(2010B080701101)

Comparison between conventional cephalograms and half-skull synthesized cone-beam computed tomography cephalograms in skeletal class Ⅲmalocclusion

Wei-ping KUANG1, Bin CAI1, Zhi-cai FENG1, Xu-shun HE1, Da-wei WANG1,()   

  1. 1.Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Stomatology, Guangzhou 510055, China
  • Received:2011-03-01 Published:2012-06-01
  • Corresponding author: Da-wei WANG
引用本文:

邝炜平, 蔡斌, 冯志才, 何旭顺, 王大为. 锥形束CT 与X 线头颅侧位定位片评价骨性Ⅲ类错 的比较[J/OL]. 中华口腔医学研究杂志(电子版), 2012, 6(03): 285-290.

Wei-ping KUANG, Bin CAI, Zhi-cai FENG, Xu-shun HE, Da-wei WANG. Comparison between conventional cephalograms and half-skull synthesized cone-beam computed tomography cephalograms in skeletal class Ⅲmalocclusion[J/OL]. Chinese Journal of Stomatological Research(Electronic Edition), 2012, 6(03): 285-290.

目的

比较锥形束计算机体层摄影术(CBCT)生成的半颅头颅侧位定位片与传统X线头颅侧位定位片的差异,探讨CBCT 生成的半颅头颅侧位定位片对骨性Ⅲ类错 患者的诊断和评价作用。

方法

选取30 例骨性Ⅲ类错手术患者。 每位患者分别在术前和术后拍摄CBCT 和X线头颅侧位定位片,并通过CBCT 生成相应的半颅头颅侧位定位片。 对两种头侧片分别进行测量,用Winceph 8.0 软件对测量值进行比较。 用Mimics 10.01 软件对CBCT 生成的三维模型进行测量。通过算式将CBCT 生成的半颅头颅侧位定位片线距测量值进行校正,将校正值与相应CBCT 三维测量值进行比较。

结果

传统头颅侧位定位片的SNA、SNB、下颌平面角、下颌升支长与CBCT 生成相应值间的差异有统计学意义,其余差异无统计学意义。 CBCT 生成的半颅头颅侧位定位片线距测量值与相应CBCT 三维测量值存在差异,但校正后两者间差异无统计学意义。

结论

CBCT 生成的半颅头颅侧位定位片在骨性Ⅲ类错 患者诊断和评价方面更准确,可以代替传统的X 线头颅侧位定位片。

Objective

To compare the difference of cephalometric measurements obtained from conventional cephalograms and cone-beam computed tomography (CBCT) synthesized half-skull cephalograms, and to investigate specific applications of CBCT synthesized half-skull cephalograms in diagnosis and treatment of patients with skeletal ClassⅢmalocclusion.

Methods

30 patients who were diagnosed as skeletal ClassⅢmalocclusion and underwent surgical-orthodontic treatment were selected.The patients took CBCT and conventional cephalograms before and after surgical treatment. Conventional and CBCT-synthesized cephalograms (right and left) were measured through Winceph8.0 and compared,and the three-dimensional models reconstructed by CBCT were evaluated using Mimics10.01. Convert the measurements derived from CBCT-synthesized cephalograms into new quantitative values using algorithm, and compare the difference between the equivalent values and the three-dimensional measurements obtained from CBCT.

Results

Significant differences in SNA、SNB、FMA、Co-Go were shown in conventional and CBCT-synthesized cephalograms, while no significant differences were shown in other measurements. All measurements of the CBCT-synthesized cephalograms were significantly different from the corresponding measurements derived from the three-dimensional models reconstructed by CBCT. When the algorithm was used to correct the two-dimensional measurements, however, no statistical differences were shown between the CBCT group and the algorithm group.

Conclusions

CBCTsynthesized cephalograms can successfully replace conventional cephalograms and provide greater accuracy in diagnosis and treatment of patients with skeletal ClassⅢmalocclusion.

图1 传统X 线头颅侧位定位片
图2 CBCT 生成的头颅侧位定位片(左)
图3 CBCT 生成的头颅侧位定位片(右)
图4 颅颌面标志点和测量项目
图5 下颌体投影图解 A.下颌体的投影长度(头颅侧位定位片上的下颌体长度);B.下颌体的实际长度;θ.AB 之间的夹角
图6 Mimics 10.01 软件在矢状面、横截面、冠状面联合定点(Gn 点)
表1 两种头颅侧位定位片术前的两两比较结果(±s)
表2 两种头颅侧位定位片术后的两两比较结果(±s)
表3 两种头颅侧位定位片在手术前后的两两比较结果(±s)
表4 校正前半颅头侧片二维测量值与CBCT 三维测量值的比较结果(mm)
表5 校正后半颅头侧片二维测量值与CBCT 三维测量值的比较结果(mm)
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