Short-term soft- and hard-tissue changes following Class III treatment using a removable mandibular retractor: a...

Area of Science:

• Orthodontics
• Craniofacial Development
• Pediatric Dentistry

Background:

• Skeletal Class III deformities present challenges in early mixed dentition.
• Early intervention is crucial for optimal treatment outcomes.
• Functional appliances offer a non-surgical approach to managing these conditions.

Purpose of the Study:

• To evaluate the efficacy of the removable mandibular retractor (RMR) for early treatment of skeletal Class III malocclusions.
• To assess the effects of RMR on craniofacial and dentoalveolar changes.
• To determine the short-term outcomes of RMR therapy in growing patients.

Main Methods:

• A randomized controlled trial involving 67 skeletal Class III patients (mean age ~7.4 years).
• Patients were randomly assigned to either RMR treatment (n=33) or a control group (n=34).
• Lateral cephalograms were analyzed before and after approximately 14.5 months to evaluate hard and soft tissue changes.

Main Results:

• The RMR group exhibited anterior morphogenetic rotation of the mandible with upward and forward condylar growth.
• Significant increases in maxillary length and dentoalveolar protrusion were observed.
• Mandibular dentoalveolar retrusion, upper lip protrusion, lower lip retrusion, and reduced nasolabial angle were noted.

Conclusions:

• The removable mandibular retractor (RMR) is an effective appliance for the short-term treatment of skeletal Class III deformities.
• Early intervention with RMR in the mixed dentition can yield favorable craniofacial and dentoalveolar changes.
• RMR therapy shows promise in improving facial aesthetics and correcting mandibular positioning.