Effect of Nasolabial Angle on Nose Shape and Teeth Shape-An Updated Review

Abstract

Background: Facial aesthetics is influenced significantly by the shape and proportions of the nose. The nasolabial angle (NLA), a key cephalometric parameter, plays a pivotal role in assessing nasal morphology and its correlation with maxillofacial structures. Despite extensive studies, the relationship between nasal features, skeletal classifications, and orthodontic treatment planning remains complex and evolving.

Aim: To investigate the relationship between the NLA and its impact on nose and teeth shape, alongside skeletal classifications and orthodontic parameters.

Methods: This study analyzed 386 cephalograms of orthodontic patients aged 9–25 years, focusing on nasal and skeletal measurements. Measurements were performed using specialized software and established cephalometric techniques. Statistical tests, including Pearson and Spearman correlations, were applied to evaluate associations, with significance set at p = 0.05.

Results: Findings highlighted a significant positive correlation between the SFC angle and skeletal parameters such as the Holdaway ratio, ANB angle, and Wits appraisal. A weak negative correlation was observed between the NLA and mandibular inclinations. No significant differences in NLA were noted across skeletal classes, and sex-related differences were minimal. Nasal growth patterns varied, with notable changes during adolescence, yet limited correlation with skeletal classifications.

Conclusion: The NLA is a critical parameter in assessing facial aesthetics and planning orthodontic treatment. While nasal morphology is linked to skeletal structures, significant variability exists, influenced by age, sex, and growth patterns. The findings emphasize the need for individualized treatment planning in orthodontics, considering both nasal and skeletal features.