Das Partha Jyoti, Dkhar Winniecia, Pradhan Abhimanyu
Postgraduate Student, Department of Medical Imaging Technology, Manipal University, Udupi, Karnataka, India.
Assistant Profesor, Department of Medical Imaging Technology, Manipal University, Udupi, Karnataka, India.
J Clin Diagn Res. 2017 Sep;11(9):TC10-TC13. doi: 10.7860/JCDR/2017/29642.10554. Epub 2017 Sep 1.
With the advancement in imaging technology, 3D dental computed tomography plays a very significant role in orthodontic treatment and diagnosis.
To evaluate dental crowding in relation to the mesiodistal crown widths and arch dimensions and also to determine the differences of dental crowding among males and females, in Southern Indian population.
A total of 132 subjects were divided into two groups: crowded and non-crowded, each comprising 66 subjects (33 males and 33 females), aged between 15 and 35 years, who were referred for computed tomography scan of brain to the radiology department, were selected. During the scan both the jaws were included in the image. The 2D images were converted to 3D images using volume rendering software. By using measurement tool, individual and collective mesiodistal crown widths of canine, first and second premolar and first molar and arch perimeter of both the maxillary and mandibular jaws were measured.
When both the gender were considered, the mesiodistal crown widths and arch perimeter were statistically significant for dental crowding in both mandibular jaw (p-value=0.001 for both mesiodistal crown width and arch perimeter) and maxillary jaw (p-value=0.016 for mesiodistal crown width and 0.002 for arch perimeter). However, when analysed separately, in males the mesiodistal crown widths and arch perimeter were statistically significant for dental crowding in both mandibular jaw (p-value=0.001 for mesiodistal crown width and 0.002 for arch perimeter) and maxillary jaw (p-value=0.002 for mesiodistal crown width and 0.001 for arch perimeter) but in females it was not statistically significant in any jaw (p-value=0.7 for mesiodistal crown width and 0.06 for arch perimeter in mandibular jaw and p-value=0.2 for mesiodistal crown width and 0.9 for arch perimeter for maxillary jaw). The crowded group had larger tooth size and smaller arch perimeter.
This study concluded that in males, both the factors i.e., mesiodistal crown width and arch dimensions contributed to dental crowding and the crowded dentition had larger mesiodistal tooth size and smaller arch dimensions; whereas, in females both the factors were not responsible for crowding in Southern Indian population.
随着成像技术的进步，三维牙科计算机断层扫描在正畸治疗和诊断中发挥着非常重要的作用。
评估印度南部人群中牙列拥挤与牙冠近远中宽度及牙弓尺寸的关系，并确定男性和女性之间牙列拥挤的差异。
总共132名受试者被分为两组：拥挤组和非拥挤组，每组66名受试者（33名男性和33名女性），年龄在15至35岁之间，这些受试者因脑部计算机断层扫描被转诊至放射科，扫描时上下颌均包含在图像中。使用容积再现软件将二维图像转换为三维图像。通过测量工具，测量犬齿、第一和第二前磨牙以及第一磨牙的个体和总体近远中牙冠宽度以及上下颌的牙弓周长。
当考虑男女两性时，下颌（近远中牙冠宽度和牙弓周长的p值均为0.001）和上颌（近远中牙冠宽度的p值为0.016，牙弓周长的p值为0.002）的近远中牙冠宽度和牙弓周长在牙列拥挤方面具有统计学意义。然而，单独分析时，男性下颌（近远中牙冠宽度的p值为0.001，牙弓周长的p值为0.002）和上颌（近远中牙冠宽度的p值为0.002，牙弓周长的p值为0.001）的近远中牙冠宽度和牙弓周长在牙列拥挤方面具有统计学意义，但女性在任何颌骨中均无统计学意义（下颌近远中牙冠宽度的p值为0.7，牙弓周长的p值为0.06；上颌近远中牙冠宽度的p值为0.2，牙弓周长的p值为0.9）。拥挤组的牙齿尺寸较大，牙弓周长较小。
本研究得出结论，在男性中，近远中牙冠宽度和牙弓尺寸这两个因素均导致牙列拥挤，拥挤的牙列具有较大的近远中牙齿尺寸和较小的牙弓尺寸；而在印度南部人群中，女性的这两个因素均与拥挤无关。
