Chaudhary Avinash, Giri Jamal, Gyawali Rajesh, Pokharel Prabhat Ranjan
Department of Orthodontics, CODS, BPKIHS, Dharan, Nepal.
Int J Dent. 2022 Aug 22;2022:2252746. doi: 10.1155/2022/2252746. eCollection 2022.
With the changing paradigm from primarily hard tissue to soft tissue evaluation for orthodontic diagnosis and treatment planning, the priority has shifted to bring about improvement in the profile and smile characteristics of patients. Since not only the esthetics but also the stability of orthodontic treatment is largely determined by the soft tissue envelope, proper positioning of the soft tissue drape becomes paramount. Soft tissues of face, namely, nose, lips, and chin, are of paramount importance not only from an esthetic but also from functional and treatment stability points.
To determine the morphological variation of lips, nose, and chin in different skeletal malocclusions.
Lateral cephalograms of 237 patients visiting the department of orthodontics, BPKIHS, were taken, hand traced on matt acetate tracing paper of 0.002″ thickness with 0.3-mm 2B pencil. Samples were divided into 3 skeletal classes based on ANB angle. Measurements were made in relation to the nose, lips, and chin. Data were inserted in to SPSS and analyzed statistically using descriptive statistics, and mean and standard deviation was calculated for each variable. Multiple comparison between groups was done with post hoc Bonferroni test with mean difference significant at < 0.05.
On intergroup comparison, a significant difference was found for upper lip thickness (ULT) between Class II and Class III, and lower lip length (LLL) between Class I and Class III, and between Class II and Class III. Significant difference for nasolabial angle (NLA) was found between Class II and Class III. Similarly, a significant difference for the vertical chin parameter (CTV) was found between Class I and Class III, and between Class II and Class III.
Both upper and lower lip thicknesses were highest for Class III followed by Class I and Class II, respectively. Lip lengths too were found to be highest for Class III skeletal relation. Nasolabial angle was larger in Class II malocclusion when compared to Class I and Class III. Similarly, both nasal length and nasal height measurements were in the order of Class III > Class II > Class I. Both horizontal and vertical chin parameters were larger for Class III sagittal relation.
随着正畸诊断和治疗计划从主要关注硬组织评估向软组织评估的范式转变，重点已转向改善患者的面部轮廓和微笑特征。由于正畸治疗的美观性和稳定性很大程度上由软组织覆盖决定，因此软组织褶皱的正确定位变得至关重要。面部软组织，即鼻子、嘴唇和下巴，不仅在美学方面，而且在功能和治疗稳定性方面都至关重要。
确定不同骨骼错牙合畸形中嘴唇、鼻子和下巴的形态变化。
对237名到BPKIHS正畸科就诊的患者拍摄头颅侧位片，用0.3毫米2B铅笔在厚度为0.002英寸的哑光醋酸纤维描图纸上手绘描图。根据ANB角将样本分为3个骨骼类型。对鼻子、嘴唇和下巴进行测量。将数据录入SPSS并使用描述性统计进行统计分析，计算每个变量的均值和标准差。组间多重比较采用事后Bonferroni检验，均值差异在<0.05时具有显著性。
组间比较发现，II类和III类之间上唇厚度（ULT）存在显著差异，I类和III类之间以及II类和III类之间下唇长度（LLL）存在显著差异。II类和III类之间鼻唇角（NLA）存在显著差异。同样，I类和III类之间以及II类和III类之间垂直下巴参数（CTV）存在显著差异。
III类的上下唇厚度最高，其次分别是I类和II类。III类骨骼关系的唇长度也最高。与I类和III类相比，II类错牙合畸形的鼻唇角更大。同样，鼻长度和鼻高度测量值均为III类>II类>I类。III类矢状关系的水平和垂直下巴参数都更大。
