Wei Ya-Nan, Cao Zhi-Yun, Li Gang, Sheng Xun, Xiong Yi-Qing, Li Wei
College of Stomatology, Kunming Medical University, Kunming 650500, China.
Dept. of Prosthodontics, The Affiliated Stomatological Hospital of Kunming Medical University, Kunming 650106, China.
Hua Xi Kou Qiang Yi Xue Za Zhi. 2019 Feb 1;37(1):53-57. doi: 10.7518/hxkq.2019.01.010.
The accuracy of the occlusion vertical dimensions of edentulous Han patients from Yunnan province was compared and analyzed on the basis of cone-beam computed tomography (CBCT)-synthesized cephalograms, closest speaking space method, and interocclusal distance.
A database correlating the CBCT head lateral images of Han patients from Yunnan province with normal occlusal conditions was first constructed. Then, five edentulous Han patients aged 63-78 years old from Yunnan Province were selected. NNT.View software was used to measure and analyze hard tissue cephalometric radiographs that had been transformed by the CBCT marker. The radiographs were then combined with the normal population database for the assessment of occlusion vertical dimensions. The occlusion vertical dimensions determined on the basis of CBCT-synthesized cephalograms, the closest speaking space method, and the free-way space were analyzed.
The closest speaking space method was used as the standard control group, the differences between seven methods and the closest speaking space method were analyzed. The seven methods include free-way space method and six CBCT-synthesized cephalograms methods (N-ANS/ANS-Me, S-Go/N-Me, ANS-Gn/N-ANS, ANS-FH/Me-FH, ANS-Xi-Pm, and CA/LA). The seven methods were highly consistent with the closest speaking space method (intraclass correlation coefficient>0.986). The absolute values of the differences between the methods of free-way space, N-ANS/ANS-Me, S-Go/N-Me and the closest speaking space method were lower than those of the other four groups (P<0.05), while the differences between ANS-FH/Me-FH and the closest speaking space method was higher than those other groups (P<0.05).
CBCT-synthesized cephalograms, with the exception of ANS-FH/Me-FH, can provide references for the clinical evaluation of the occlusion vertical dimensions of patients with edentulous jaws.
基于锥形束计算机断层扫描（CBCT）合成头影测量片、最接近说话时间隙法和牙合间距离，对云南省无牙颌汉族患者牙合垂直距离的准确性进行比较分析。
首先构建一个将云南省咬合正常的汉族患者的CBCT头颅侧位图像相关联的数据库。然后，选取5名年龄在63 - 78岁之间的云南省无牙颌汉族患者。使用NNT.View软件测量和分析经CBCT标记物转换后的硬组织头影测量X线片。然后将这些X线片与正常人群数据库相结合，以评估牙合垂直距离。分析基于CBCT合成头影测量片、最接近说话时间隙法和息止间隙确定的牙合垂直距离。
以最接近说话时间隙法作为标准对照组，分析七种方法与最接近说话时间隙法之间的差异。这七种方法包括息止间隙法和六种CBCT合成头影测量片方法（N - ANS/ANS - Me、S - Go/N - Me、ANS - Gn/N - ANS、ANS - FH/Me - FH、ANS - Xi - Pm和CA/LA）。这七种方法与最接近说话时间隙法高度一致（组内相关系数>0.986）。息止间隙法、N - ANS/ANS - Me、S - Go/N - Me与最接近说话时间隙法之间差异的绝对值低于其他四组（P<0.05），而ANS - FH/Me - FH与最接近说话时间隙法之间的差异高于其他组（P<0.05）。
除ANS - FH/Me - FH外，CBCT合成头影测量片可为无牙颌患者牙合垂直距离的临床评估提供参考。
