Alveolar and Skeletal Chin Dimensions Associated with Lower Facial Height Among Different Divergent Patterns

Area of Science:

• Orthodontics
• Cephalometrics
• Facial Growth Analysis

Background:

• Alveolar and skeletal chin dimensions, along with facial height, are crucial for orthodontic diagnosis, treatment planning, and aesthetic evaluation.
• Understanding these measurements in relation to facial divergence is essential for predictable outcomes.

Purpose of the Study:

• To evaluate skeletal and alveolar chin dimensions across different facial divergence patterns.
• To assess lower face height variations in distinct divergent growth patterns.
• To provide data for oral surgeons regarding potential adjunctive procedures.

Main Methods:

• A retrospective analysis of 45 non-growing individuals (aged 18-25 years) was conducted.
• Participants were categorized into normodivergent, hypodivergent, and hyperdivergent groups based on mandibular plane angle.
• Standardized digital lateral and antero-posterior cephalograms were analyzed.

Main Results:

• Hard tissue chin measurements were greater in the hypodivergent group (13.7mm).
• Increased lower facial height showed a statistically significant difference in the high mandibular plane angle (hyperdivergent) group (59.6mm).
• Transverse width in antero-posterior cephalograms differed significantly in the normodivergent group (32.60mm).

Conclusions:

• The antero-posterior width of the symphysis was greater in the hypodivergent pattern, while vertical symphyseal height was greater in the hyperdivergent group.
• Lower facial height significantly differed among the three groups, particularly in the hyperdivergent pattern.
• Statistically significant differences in antero-posterior cephalogram measurements were noted in the normodivergent group compared to the other two.