Soft-tissue changes associated with different surgical procedures for treating class III patients.

Area of Science:

• Orthodontics and Dentofacial Orthopedics
• Surgical Procedures
• Cephalometric Analysis

Background:

• Class III malocclusion presents significant skeletal and soft-tissue challenges.
• Surgical correction aims to improve both facial esthetics and functional occlusion.
• Different surgical techniques may yield varying outcomes in soft-tissue and skeletal changes.

Purpose of the Study:

• To evaluate the effects of maxillary advancement, bimaxillary surgery, and mandibular setback on soft-tissue and skeletal changes.
• To compare the outcomes of different surgical procedures for Class III malocclusion.
• To assess the impact of surgical correction on specific cephalometric and soft-tissue parameters.

Main Methods:

• Retrospective analysis of lateral cephalograms from 191 Class III patients (aged 16-58).
• Patients were divided into three groups: maxillary advancement, bimaxillary surgery, and mandibular setback.
• Cephalometric analysis included SNA, SNB, Wits value, gonial angle, nasolabial angle, and lower lip-esthetic line distance.

Main Results:

• Maxillary advancement and bimaxillary procedures have increased in recent years.
• Skeletal parameters (SNA, SNB) showed a tendency toward normalization across all groups.
• Significant improvements in the nasolabial angle were observed, particularly in groups with maxillary advancement.

Conclusions:

• Maxillary advancement procedures (alone or combined) lead to notable improvements in soft-tissue esthetics.
• Surgical correction of Class III malocclusion can yield favorable skeletal and esthetic results.
• The choice of surgical approach influences soft-tissue outcomes, especially nasolabial angle changes.