Division of Periodontology, College of Dentistry, The Ohio State University, 305 West 12th Avenue, Columbus, OH, 43210, USA.
Dentistry Administration, King Fahad Medical City, Riyadh, Kingdom of Saudi Arabia.
Clin Oral Investig. 2021 Oct;25(10):5907-5915. doi: 10.1007/s00784-021-03896-7. Epub 2021 Mar 21.
The present case series aimed to examine lip repositioning surgery (LRS) outcomes related to changes in external and internal upper lip (UL) dimensions, utilizing both conventional clinical and novel radiographic approaches.
Patients (n = 13) diagnosed with hypermobile UL (>8-mm mobility during smile) and excessive gingival display (≥4-mm) were included and assessed at baseline and 6 months postoperatively. Clinical parameters at rest included total lip and internal lip length (vestibular depth). At maximum smile included total lip, philtrum (ergotrid), and vermilion lengths. Cephalometric parameters included anterior maxillary height; lip length; nasolabial angle; anteroposterior lip thickness; internal lip length (vestibular depth); and vestibular fornix position (using novel approach employing radiopaque marker). Linear mixed-effect models, Pearson's correlation, and linear regression were used for statistical analyses.
LRS did not affect total UL length at rest (p = 0.418). It resulted in significant internal UL length decrease (-3.8 ± 2.1 mm, p < 0.001) and significant increases of vermilion length (1.9 ± 1.0 mm, p < 0.001) and anteroposterior lip thickness (0.7 ± 0.7 mm, p = 0.002). The clinical and radiographic measurements of total UL length at rest (r ≥ 0.734) and of internal UL length (r ≥ 0.737), and the two radiographic assessments of vestibular depth (r = 0.842), were strongly correlated.
LRS resulted in significant decrease of vestibular depth/internal UL length and in significant increases of UL vertical vermilion length and UL anteroposterior thickness, without affecting total UL length at rest.
The documented lip dimensional outcomes should help practitioners when treatment-planning LRS and counseling patients seeking treatment for hypermobile UL.
本病例系列旨在通过传统临床和新型影像学方法，检查唇复位术（LRS）与上唇（UL）外部和内部尺寸变化相关的结果。
纳入了诊断为 UL 过度活动（微笑时>8mm 活动度）和过度牙龈显露（≥4mm）的患者（n=13），并在基线和术后 6 个月进行评估。休息时的临床参数包括总唇和内唇长度（前庭深度）。最大微笑时包括总唇、人中（驼峰）和唇红长度。头影测量参数包括上颌前高度；唇长；鼻唇角；唇前后厚度；内唇长度（前庭深度）；和前庭窝位置（采用新型放射性标记方法）。线性混合效应模型、皮尔逊相关性和线性回归用于统计分析。
LRS 不影响休息时的总 UL 长度（p=0.418）。它导致内唇长度显著减少（-3.8±2.1mm，p<0.001），唇红长度显著增加（1.9±1.0mm，p<0.001）和唇前后厚度增加（0.7±0.7mm，p=0.002）。休息时总 UL 长度（r≥0.734）和内唇长度（r≥0.737）的临床和影像学测量，以及前庭深度的两种影像学评估（r=0.842）之间存在高度相关性。
LRS 导致前庭深度/内唇长度显著减少，UL 垂直唇红长度和 UL 前后厚度显著增加，而休息时总 UL 长度不受影响。
记录的唇部尺寸结果应有助于临床医生在计划 LRS 治疗和为寻求治疗 UL 过度活动的患者提供咨询时。
