Nasal profile changes after orthodontic tooth extraction in Class II, Division 1 malocclusion patients: A...

Area of Science:

• Orthodontics
• Dentofacial Orthopedics
• Facial Aesthetics

Background:

• Dental Class II malocclusion presents challenges in achieving ideal facial aesthetics.
• Fixed orthodontic treatment is a common approach for correcting malocclusions.
• Understanding soft-tissue profile changes, particularly nasal alterations, is crucial for treatment success.

Purpose of the Study:

• To investigate the impact of fixed orthodontic treatment on the facial soft-tissue profile, with a specific focus on nasal changes.
• To compare these changes in patients with Class II malocclusion undergoing non-extraction, upper premolar extraction, or four-premolar extraction protocols.

Main Methods:

• Cephalometric analysis of 81 Class II malocclusion patients before and after fixed orthodontic treatment.
• Categorization into three groups: non-extraction, upper first premolar extraction, and four first premolar extractions.
• Measurement of various facial soft-tissue parameters including lip heights, nasolabial and nasomental angles, and nasal parameters.

Main Results:

• Significant increases in nasolabial angle and nasal depth were observed in the upper two extraction group.
• Decreases in columella convexity and upper lip to E-plane were noted in the extraction group.
• Significant differences were found in nasolabial angle, columella convexity, and lower lip to E-plane based on extraction status.

Conclusions:

• Orthodontic treatment, particularly with tooth extraction, can influence the nasolabial angle and nasal depth.
• These findings highlight the importance of considering potential nasal changes during orthodontic treatment planning.
• Adjustments may be necessary to achieve desired esthetic results in the facial profile.