Ralte Lalsangliana, Singh G K, Singh Alka, Sharma Vipul Kumar
Department of Dentistry, Zoram Medical College, Aizawl, Mizoram, India.
Department of Orthodontics and Dentofacial Orthopaedics, Faculty of Dental Science, King George's Medical University, Lucknow, Uttar Pradesh, India.
Natl J Maxillofac Surg. 2022 May-Aug;13(2):229-233. doi: 10.4103/njms.njms_418_21. Epub 2022 Jun 15.
The objective of the study is to evaluate the morphology of the symphyseal region of adult skeletal Class II and Class III malocclusion as compared with Skeletal Class I subjects.
The symphyseal width and height were evaluated using data from 80 lateral cephalograms of the age range of 18 years to 25 years. Average growing Skeletal Class II ( = 30) and Class III ( = 20) subjects were used as a comparison group. Average growing normal occlusion samples ( = 30) were used as controls.
Alveolar height was similar in all groups. The width of the symphyseal region including basal width, the width of the cervical region of the lower central incisor at the cementoenamel junction, and symphysis width were found to be similar in all groups. There is no significant difference in gonial angle in both Class II and III groups as compared to control. Articular angle showed no significant difference. Mandibular incisor dentoalveolar height (L1-AH) was found to be significantly higher in the Class II group ( < 0.05).
There are no definite morphological differences in the symphyseal region between average grower Class I, Class II, and Class III skeletal malocclusions except mandibular incisor dentoalveolar height (L1-AH) and incisor mandibular plane angle which is higher whereas ramus length and body length which is lesser in Class II group as compared with controls. Width of the cervical region of the lower central incisor at the cementoenamel junction (Id-Id') and incisor mandibular plane angle was lower than control in Class III subjects.
本研究的目的是评估成年骨骼II类和III类错牙合畸形患者与骨骼I类受试者相比，其耻骨联合区域的形态。
使用80张年龄在18岁至25岁之间的头颅侧位片数据评估耻骨联合的宽度和高度。平均生长发育期的骨骼II类（n = 30）和III类（n = 20）受试者作为比较组。平均生长发育期的正常牙合样本（n = 30）作为对照组。
所有组的牙槽高度相似。发现包括基底宽度、下中切牙牙釉质牙骨质界处颈部区域的宽度以及耻骨联合宽度在内的耻骨联合区域宽度在所有组中相似。与对照组相比，II类和III类组的下颌角均无显著差异。关节角无显著差异。发现II类组的下颌切牙牙槽高度（L1 - AH）显著更高（P < 0.05）。
平均生长发育期的I类、II类和III类骨骼错牙合畸形患者的耻骨联合区域除下颌切牙牙槽高度（L1 - AH）和切牙下颌平面角外，没有明确的形态学差异，II类组的切牙下颌平面角更高，而升支长度和体长比对照组短。III类受试者下中切牙牙釉质牙骨质界处颈部区域的宽度（Id - Id'）和切牙下颌平面角低于对照组。
