Morphologic changes of the palate after rapid maxillary expansion: a 3-dimensional computed tomography evaluation

Area of Science:

• Orthodontics
• Craniofacial development
• Dental imaging

Background:

• Early mixed dentition presents opportunities for orthopedic intervention.
• Maxillary hypoplasia can impact facial aesthetics and function.
• Rapid maxillary expansion (RME) is a common treatment for maxillary constriction.

Purpose of the Study:

• To quantify palatal area changes following RME in early mixed dentition.
• To evaluate linear dimensions of the maxillary arch post-RME.
• To assess the efficacy of 3D helical CT scanning for analyzing RME outcomes.

Main Methods:

• Retrospective study of 43 children treated with RME and 7 controls.
• 3D helical computed tomography (CT) scanning of dental casts.
• Statistical analysis using Student t test to compare pre- and post-treatment measurements.

Main Results:

• RME led to significant increases in interdental widths (canines, deciduous first molars, permanent first molars).
• A notable increase in cross-sectional area was observed around the permanent first molars (15.3 mm²).
• Variability in buccal tipping of permanent first molars was noted.

Conclusions:

• 3D helical CT scanning is a precise and efficient method for evaluating dental cast changes.
• This technique provides accurate data acquisition and analysis for orthodontic research.
• RME effectively expands the maxillary arch in the early mixed dentition stage.