Cast Haas-type RME appliance: A case report.

Area of Science:

• Dentistry
• Orthodontics
• Pediatric Dentistry

Background:

• Rapid maxillary expansion (RME) is a common orthodontic procedure for addressing transverse discrepancies during early occlusal development.
• Anchoring RME appliances to primary teeth can minimize adverse effects on permanent teeth during mixed dentition treatment.

Observation:

• A modified Haas-type RME appliance was used in a 7-year-old Caucasian girl with maxillary transverse deficiency, unilateral crossbite, midline deviation, and anterior crowding.
• The appliance featured a custom metal-cast structure bonded to primary teeth with glass-ionomer cement for improved stability and reduced decementation risk.
• The appliance is fabricated with hypoallergenic materials, suitable for patients with allergies.

Findings:

• The modified RME appliance, anchored to primary teeth, successfully achieved maxillary expansion.
• The expansion was stable and positively influenced the position of permanent molars.
• The appliance offered advantages in terms of application speed and patient compliance.

Implications:

• This approach provides a viable and stable method for correcting transverse maxillary deficiencies in the mixed dentition using primary teeth anchorage.
• The modified appliance design enhances clinical efficiency and patient tolerance, particularly for those with allergies.
• Early intervention with RME anchored to primary teeth can lead to favorable long-term orthodontic outcomes.