Effect of the vertical facial pattern on the developmental relationship between the nasal bone and maxillary central incisors

Background: This study aimed to investigate the effect of the vertical facial pattern on the developmental relationship between the nasal bone and maxillary central incisors. Methods: : In this retrospective comparative study, the lateral cephalograms of 213 subjects (51 Male; 162 Female) with skeletal Class I malocclusion (aged 18 to 32 years) were classified into three equal groups; hyperdivergent, normodivergent, and hypodivergent facial patterns based on the mandibular plane inclination (S-N/Go-Me). The following measurements were extracted; gradient and length of the nasal bone and maxillary central incisor, the distance from apex and root of the nasal bone, and maxillary central incisor to the true perpendicular from the digitized lateral cephalograms. The significance level was considered at P < 0.05. Results: : 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 types. 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 of the hypodivergent and normodivergent groups. The maxillary central incisor length in the hyperdivergent group is significantly longer than in the hypodivergent group. Conclusion: There was a correlation between nasal bone and maxillary central incisor during the growth and development of the maxillofacial region. In Class I malocclusion subjects, hypodivergent patients were more likely to have a prominent and relatively short nasal bone and maxillary central incisor and vice versa.