Department of Orthodontics, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangdong Engineering Research Center of Oral Restoration and Reconstruction, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, 510182, Guangdong, China.
Department of Preventive Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia.
BMC Oral Health. 2023 Apr 12;23(1):211. doi: 10.1186/s12903-023-02927-x.
This study aimed to investigate the effect of vertical facial patterns on the developmental relationship between the nasal bone and maxillary central incisors.
In this retrospective comparative study, the lateral cephalograms of 213 subjects (51 Males, 162 Females) with skeletal Class I malocclusion (aged 18-32 years) were classified into three equal groups: (1) hyperdivergent, (2) normodivergent, and (3) hypodivergent facial patterns based on the mandibular plane inclination (S-N/Go-Me). Several sets of measurements were extracted: (1) gradient and length of the nasal bone and maxillary central incisor, (2) the distance from apex and root of the nasal bone, and (3) maxillary central incisor to the true perpendicular from the digitized lateral cephalograms. The significance level was considered at P < 0.05.
The inclination angle and length between nasal bone and maxillary central incisor were positively correlated independent of vertical facial type. The inclination angle of the nasal bone in the hypodivergent group was significantly larger than the other two vertical facial patterns. The inclination angle of the maxillary central incisor increased successively in the hyperdivergent, normodivergent, and hypodivergent groups. The length of the nasal bone in the hyperdivergent group was significantly longer than that in the hypodivergent and normodivergent groups. The maxillary central incisor length in the hyperdivergent group was significantly longer than in the hypodivergent group.
A correlation between nasal bone and maxillary central incisors during the growth and development of the maxillofacial region was found. In Class I malocclusion subjects, hypodivergent patients were more likely to have a prominent and relatively short nasal bone and maxillary central incisors and vice versa.
本研究旨在探讨面型的垂直向特征对鼻骨和上颌中切牙发育关系的影响。
本回顾性对比研究共纳入 213 例（男 51 例，女 162 例）骨骼 I 类错（18-32 岁）患者，根据下颌平面角（S-N/Go-Me）将其分为三组：（1）高角型，（2）均角型，（3）低角型。测量了鼻骨和上颌中切牙的（1）梯度和长度、（2）鼻骨根尖到近远中顶点的距离、（3）上颌中切牙与侧位片真垂线的距离。采用独立样本 t 检验和单因素方差分析比较组间差异，P<0.05 为差异有统计学意义。
鼻骨和上颌中切牙之间的倾斜角和长度与垂直面型无关呈正相关。低角组的鼻骨倾斜角显著大于其他两组。上颌中切牙的倾斜角逐渐增大，分别为高角组、均角组和低角组。高角组的鼻骨长度显著长于低角组和均角组。高角组的上颌中切牙长度显著长于低角组。
在颌面生长发育过程中，鼻骨和上颌中切牙之间存在相关性。在 I 类错（牙合）畸形患者中，低角患者的鼻骨相对突出且较短，上颌中切牙较长，反之亦然。
