Morphometric analysis of palatal rugae in different malocclusions

Area of Science:

• Dentistry
• Orthodontics
• Human Anatomy

Background:

• Palatal rugae (PR) are unique anatomical landmarks on the palate.
• Limited research exists on the association between PR and malocclusion.
• PR are considered relatively stable but can be affected by treatments like rapid maxillary expansion.

Purpose of the Study:

• To investigate the association between morphometric measurements of palatal rugae (PR) and sagittal/vertical malocclusion characteristics.
• To test the hypothesis that PR differ among malocclusions due to genetic and environmental factors.

Main Methods:

• Laser scanning of maxillary dental casts from 243 individuals.
• Measurement of the first three PR in transverse and anteroposterior directions.
• Analysis of variance and Pearson correlations comparing PR measurements with cephalometric data across different malocclusion classes (I, II, III) and vertical patterns (hypo-, normo-, hyperdivergent).

Main Results:

• Significant differences in PR measurements were found among malocclusion groups, especially related to vertical patterns.
• Class II Division 2 subjects exhibited the largest transverse and anteroposterior PR measurements.
• PR orientation varied with vertical patterns, being more anterior in hypodivergent individuals; transverse rugae separation was smaller in these groups. Correlations were generally low.

Conclusions:

• Palatal rugae (PR) may exhibit adaptation to environmental influences in developing malocclusions, notably in the Class II Division 2 phenotype.
• Further longitudinal research is needed to understand long-term environmental impacts on PR morphology, superimposed on genetic influences.