Department of Orthodontics, Faculty of Medicine and Dentistry, University of Valencia, Spain.
Department of Orthodontics, Faculty of Medicine and Dentistry, University of Valencia, Spain.
J Craniomaxillofac Surg. 2017 Aug;45(8):1205-1211. doi: 10.1016/j.jcms.2017.04.002. Epub 2017 Apr 19.
The aim of this study was to study the relations between the soft tissue chin (STC) and sex, skeletal class, and facial pattern; and to describe the shape and behavior of the STC.
385 non-growing patients were selected, 206 women and 179 men, with a mean age of 28.8 years (SD 4.2). Patients were divided into groups by skeletal class (class I, II or III) and facial pattern (brachyfacial, mesofacial or dolichofacial). STC thicknesses were measured at pogonion (Pg), soft pogonion (Pg'), gnathion (Gn), soft gnathion (Gn'), menton (Me) and soft menton (Me') in the CBCTs.
Sexual dimorphism was observed at Pg-Pg' and Me-Me'. STC thickness was not related to skeletal class but related to facial pattern. Pg-Pg' and Me-Me' measurements showed significant differences to the combination of skeletal class/facial pattern. STC thickness was not homogenous in terms of shape and behavior.
The results provide evidence of a strong but complex relationship between sex, facial pattern, skeletal class and STC thickness; for this reason, each patient must be evaluated individually before undergoing orthodontics or orthognathic surgery involving the mandible and the mandibular symphysis.
本研究旨在研究软组织颏（STC）与性别、骨骼类型和面部形态之间的关系；并描述 STC 的形状和行为。
选择了 385 名非生长患者，其中 206 名女性和 179 名男性，平均年龄为 28.8 岁（SD 4.2）。患者根据骨骼类型（I 类、II 类或 III 类）和面部形态（短面型、中面型或长面型）分为几组。在 CBCT 中测量了颏下点（Pg）、软组织颏下点（Pg'）、下颌前点（Gn）、软组织下颌前点（Gn'）、颏下点（Me）和软组织颏下点（Me'）的 STC 厚度。
在 Pg-Pg'和 Me-Me'处观察到性别二态性。STC 厚度与骨骼类型无关，但与面部形态有关。Pg-Pg'和 Me-Me'的测量值与骨骼类型/面部形态的组合有显著差异。STC 厚度在形状和行为方面不均匀。
结果提供了强有力但复杂的证据，证明了性别、面部形态、骨骼类型和 STC 厚度之间存在关系；因此，在进行涉及下颌和下颌联合的正畸或正颌手术之前，必须对每个患者进行单独评估。
