Chin soft tissue thickness and mandibular divergency: a cross-sectional study

Area of Science:

• Orthodontics and Dentofacial Orthopedics
• Anthropology
• Forensic Science

Background:

• Chin morphology, encompassing soft tissue thickness and mandibular divergence, is influenced by various demographic and skeletal factors.
• Understanding these variations is critical for accurate diagnosis and treatment planning in craniofacial applications.

Purpose of the Study:

• To assess chin soft tissue thickness and mandibular divergence in an adult population.
• To explore demographic correlations (age, gender) with these chin characteristics.
• To investigate the relationship between soft tissue parameters and mandibular divergence patterns.

Main Methods:

• Analysis of 465 lateral cephalograms from adult subjects.
• Cephalometric measurements to determine anteroposterior and vertical skeletal classifications.
• Assessment of chin soft tissue thickness and mandibular divergence angles (e.g., FMA, SN-GoMe).

Main Results:

• Statistically significant differences in ANB angle and soft tissue thickness at Pog and Me points were observed between males and females.
• Most measured parameters showed significant differences based on age, with exceptions like FMA and Gn.
• Mandibular divergence, measured by SN-GoMe, showed significant age and gender variations, unlike FMA.

Conclusions:

• Chin soft tissue thickness and morphology are significantly influenced by age, gender, and malocclusion patterns.
• These findings are vital for personalized orthodontic and orthognathic surgical treatment planning.
• The study provides valuable insights for forensic and anthropological assessments requiring chin morphology interpretation.