Removable functional appliances effective in patients with Class II malocclusions

Area of Science:

• Orthodontics
• Craniofacial Development
• Dental Public Health

Background:

• Class II malocclusion is a common dental anomaly affecting facial aesthetics and function.
• Removable functional appliances (RFAs) are widely used for early intervention in growing patients.
• Evidence on the precise effects of RFAs on skeletal, dental, and soft tissue changes requires synthesis.

Purpose of the Study:

• To systematically evaluate the effectiveness of removable functional appliances (RFAs) compared to non-intervention controls in treating Class II malocclusions.
• To quantify skeletal, dental, and soft tissue changes using cephalometric analysis.

Main Methods:

• A comprehensive literature search was conducted across 19 databases, including Medline, Embase, and Cochrane.
• Randomized controlled trials (RCTs) and prospective controlled clinical trials (pCCTs) comparing RFAs with non-intervention controls were included.
• Data extraction and risk of bias assessment were performed independently by two reviewers, with meta-analysis of pooled data using a random-effects model.

Main Results:

• Seventeen studies (7 RCTs, 10 pCCTs) with 1031 patients were analyzed.
• RFAs demonstrated statistically significant short-term effects on skeletal, dental, and soft tissue relationships.
• Key findings include minimal skeletal changes, significant retroclination of maxillary incisors, proclination of mandibular incisors, and notable soft tissue alterations, particularly the mentolabial angle.

Conclusions:

• Removable functional appliances show short-term efficacy in managing Class II malocclusions.
• Treatment primarily results in significant dentoalveolar and soft tissue modifications rather than substantial skeletal changes.
• Further high-quality research is needed to understand long-term outcomes and optimal RFA use.