Miniscrew anchorage versus Class II elastics for maxillary arch distalization using clear aligners.

Area of Science:

• Orthodontics
• Biomaterials in Dentistry

Background:

• Class II malocclusion is common, often requiring maxillary arch distalization.
• Clear aligner therapy offers aesthetic advantages but requires effective anchorage for complex movements.
• Traditional anchorage methods like Class II elastics have limitations in controlling tooth movement.

Purpose of the Study:

• To compare the effectiveness of intramaxillary miniscrew anchorage versus Class II elastics for maxillary arch distalization.
• To evaluate the control of tooth displacement and angulation during clear aligner treatment.

Main Methods:

• A comparative study involving 30 adult patients with Class II dentition treated with clear aligners.
• Patients were divided into two groups: intramaxillary miniscrew anchorage (n=17) and Class II elastics (n=13).
• Three-dimensional analysis of predicted and achieved tooth movements and angular changes.

Main Results:

• Both methods achieved comparable maxillary arch distalization efficiency for posterior and anterior teeth.
• Miniscrew anchorage demonstrated significantly less incisor extrusion and posterior tooth distal tipping.
• Arch expansion, posterior buccal inclination, and anterior lingual inclination were similar between groups.

Conclusions:

• Intramaxillary miniscrew anchorage and Class II elastics are equally effective for maxillary arch distalization in clear aligner therapy.
• Miniscrew anchorage offers enhanced control over vertical tooth position and mesiodistal tipping, improving treatment predictability.