Bhullar Mandeep Kaur, Uppal Amandeep Singh, Kochhar Gulsheen Kaur, Chachra Sanjay, Kochhar Anuraj Singh
Department of Orthodontics and Dentofacial Orthopedics, Luxmi Bai Institute of Dental Sciences and Hospital, Patiala, Punjab, India.
Department of Conservative Dentistry and Endodontics, HSJ Institute of Dental Sciences and Hospital, Panjab University, Chandigarh, India.
Indian J Dent. 2014 Jul;5(3):123-6. doi: 10.4103/0975-962X.140820.
Gonial angle is an important parameter of the craniofacial complex giving an indication about the vertical parameters and symmetry of the facial skeleton. Both orthopantomogram (OPG) and lateral cephalograms can be used for the measurement of gonial angle. Because of the superimpositions seen on lateral cephalograms, reliable measurement of the gonial angle becomes difficult. The aim of the present study is to check the possible application and reliability of OPG for gonial angle determination by clarifying whether there is any significant difference between the determination of gonial angle from OPG and cephalogram.
Gonial angle measurements were made on lateral cephalograms and orthopantomograms of 98 patients - 44 males (mean age 25.9 years) and 54 females (mean age 21.3 years), and compared using Statistical Package for Social Sciences.
One-way analysis of variance demonstrated no significant differences between the values of gonial angles determined by lateral cephalogram and panoramic radiography. Pearson correlation showed a high correlation between cephalometric and OPG gonial angle value.
Panoramic radiography can be used to determine the gonial angle as accurately as a lateral cephalogram. For determination of the gonial angle, an OPG may be a better choice than a lateral cephalogram as there are no interferences due to superimposed images of anatomical structures as in a lateral cephalogram. Thus, the present study substantiates the possibility of enhancing the clinical versatility of the panoramic radiograph, which is an indispensable tool for dental diagnosis.
下颌角是颅面复合体的一个重要参数，可反映面部骨骼的垂直参数和对称性。口腔全景片（OPG）和头颅侧位片均可用于测量下颌角。由于头颅侧位片上存在结构重叠，下颌角的可靠测量变得困难。本研究的目的是通过阐明从口腔全景片和头颅侧位片测量下颌角之间是否存在显著差异，来检验口腔全景片在确定下颌角方面的可能应用及可靠性。
对98例患者（44例男性，平均年龄25.9岁；54例女性，平均年龄21.3岁）的头颅侧位片和口腔全景片进行下颌角测量，并使用社会科学统计软件包进行比较。
单因素方差分析表明，头颅侧位片和全景片测量的下颌角值之间无显著差异。Pearson相关性分析显示，头影测量和口腔全景片下颌角值之间具有高度相关性。
全景片可像头颅侧位片一样准确地用于确定下颌角。对于下颌角的测定，口腔全景片可能比头颅侧位片是更好的选择，因为不像头颅侧位片那样存在解剖结构重叠影像的干扰。因此，本研究证实了增强全景片临床实用性的可能性，全景片是牙科诊断不可或缺的工具。
