Krishna Veni Sampath, Elsayed Mennattallah, Singh Isha S, Nayan Kamal, Varma Praveen K, Naik Moode Kaladhar
Department of Orthodontics and Dentofacial Orthopedics, Government Dental College and Hospital Kadapa, Andhra Pradesh, India.
B.D.S, R.D.H, Florida, USA.
J Pharm Bioallied Sci. 2023 Jul;15(Suppl 1):S248-S251. doi: 10.4103/jpbs.jpbs_478_22. Epub 2023 Jul 5.
The purpose of this study was to assess the short-term perioral soft tissue variations of the lips before and after treatment cases in 15 patients with bi-maxillary protrusion using treated lateral cephalograms who had already achieved active growth.
Fifteen pre-treatment and post-treatment lateral cephalometric radiographs of 18-25-year-old individuals with bimaxillary protrusion treated with all four 1 premolar extractions were accessed from the records. From the reference planes and landmarks, 13 horizontal, 10 vertical, and 2 angular measurements were noted. Statistical comparisons between pre-treatment and post-treatment measurements were measured by a paired t-test to assess the importance of the mean variations at the predetermined significance level. Pearson's correlation coefficient (R) was utilized to assess the strength and significance of the linear relationship between the mean differences for paired (dependent and independent) variables.
Pearson's correlation exhibited a noteworthy positive association between the horizontal changes in upper lip position and the horizontal changes of the upper incisor tip point (H-tU) (R = 0.748), the upper incisor cervical point (H-cU) (R = 0.707), the lower incisor tip point (H-tL) (R = 0.839), and the lower incisor cervical point (H-cL) (R = 0.767). This indicated that upper lip changes are the aftermath of the retraction of the upper and lower incisors in class I bi-maxillary protrusion malocclusion.
Thick upper lips showed more retraction of the upper lip in correlation with retraction of the incisors as compared with thin lips. The lower incisor cervical point displayed the strongest association with lower lip retraction.
本研究旨在利用已完成生长发育的经治疗的头颅侧位片，评估15例双颌前突患者治疗前后口周唇部软组织的短期变化。
从记录中获取15例年龄在18 - 25岁、采用拔除四颗第一前磨牙治疗双颌前突患者的治疗前和治疗后的头颅侧位X线片。从参考平面和标志点记录13项水平测量、10项垂直测量和2项角度测量。通过配对t检验对治疗前和治疗后测量值进行统计学比较，以评估在预定显著性水平下平均变化的重要性。利用Pearson相关系数（R）评估配对（相关和独立）变量平均差异之间线性关系的强度和显著性。
Pearson相关性显示，上唇位置的水平变化与上切牙切端点（H - tU）的水平变化（R = 0.748）、上切牙颈点（H - cU）（R = 0.707）、下切牙切端点（H - tL）（R = 0.839）和下切牙颈点（H - cL）（R = 0.767）之间存在显著正相关。这表明在I类双颌前突错牙合畸形中，上唇变化是上下切牙后缩的结果。
与薄唇相比，厚上唇在切牙后缩时上唇后缩更明显。下切牙颈点与下唇后缩的相关性最强。
