Impellizzeri Alessandra, Palmigiani Raissa, Horodynski Martina, D'alfonso Tiziana, Polimeni Antonella, De Stefano Adriana, Galluccio Gabriella
Department of Oral and Maxillofacial Sciences, Sapienza University of Rome, 00161 Rome, Italy.
Department of Computer, Control and Management Engineering, Sapienza University of Rome, 00161 Rome, Italy.
Healthcare (Basel). 2023 Jan 25;11(3):344. doi: 10.3390/healthcare11030344.
Excessive gingival display or "gummy smile" is a clinical condition where a maxillary gum shows between the inferior line of the superior lip and the gingival line of the incisive superior during a spontaneous smile. The aim of this research was to understand the various skeletal and dentoalveolar components contributing to a gummy smile in a sample of 120 patients.
This retrospective case-control study had the primary objectives of analyzing the existence of a correlation between the presence of gingival exposure and the alteration of the inclination of the upper incisors with respect to the Frankfurt plane, the Palatine plane (bi-spinal) and to the NA line in a sample of orthodontic patients, and also evaluating the association with skeletal, dental, and aesthetic cephalometric parameters.
In our study, it's emerged a correlation between the gingival exposure and the presence of alterations to incisal torque in the vestibular direction and the quantity of maxillary gingiva evident during the smile, which is correlated in particular to the Is-Sts distance, overjet and overbite. The major indicative data, therefore, are related to the vertical position of the upper incisors, in particular with respect to the upper lip and to the sagittal position.
牙龈过度外露或“露龈笑”是一种临床状况，即在自然微笑时，上颌牙龈出现在上唇下缘与上颌切牙牙龈线之间。本研究的目的是了解120例患者样本中导致露龈笑的各种骨骼和牙-牙槽成分。
这项回顾性病例对照研究的主要目的是分析正畸患者样本中牙龈暴露的存在与上颌切牙相对于法兰克福平面、腭平面（双脊椎）和NA线的倾斜度改变之间的相关性，同时评估与骨骼、牙齿和美学头影测量参数的关联。
在我们的研究中，牙龈暴露与前庭方向切牙扭矩改变以及微笑时上颌牙龈明显量之间存在相关性，这尤其与Is-Sts距离、覆盖和覆合相关。因此，主要指示数据与上颌切牙的垂直位置有关，特别是相对于上唇和矢状位置。
