A multivariate approach to analyzing the relation between occlusion and craniofacial morphology

Area of Science:

• Orthodontics and Dentofacial Orthopedics
• Craniofacial Biology
• Dental Morphology

Background:

• Understanding the relationship between dental occlusion and underlying skeletal structure is crucial for diagnosing and treating malocclusion.
• Previous research has explored these associations, but comprehensive analyses integrating multiple occlusal and skeletal variables are ongoing.

Purpose of the Study:

• To investigate the associations between various occlusal characteristics and craniofacial skeletal morphology in children with early permanent dentition.
• To determine if a malocclusion severity index correlates with specific craniofacial skeletal patterns.

Main Methods:

• Utilized univariate and multivariate statistical methods, including linear correlation, stepwise multiple regression, and canonical correlation analyses.
• Assessed multiple occlusal features (molar relation, overjet, overbite, anterior crowding) and angular skeletal measures from study casts and lateral cephalometric radiographs of 164 children.
• Examined the correlation between the Occlusal Index (a malocclusion severity index) and skeletal morphology.

Main Results:

• Individually and in combination, occlusal features demonstrated weak associations with individual skeletal measures (r² ≤ 0.35).
• A significant association was found between combined occlusal features and combined skeletal measures (R² = 0.66, p = 0.0001).
• The Occlusal Index did not effectively identify specific craniofacial morphologies.

Conclusions:

• Specific combinations of occlusal characteristics may be linked to particular craniofacial skeletal types.
• A generalized association between malocclusion severity and craniofacial morphology could not be established from this study.
• Further research is needed to elucidate the complex interplay between occlusion and skeletal development.