| Field | Value |
|---|---|
| ID | OA-0195 |
| Type | component |
| Category | component |
| Fixed/removable | fixed (on archwire between brackets) |
| Primary function | space closure; rotation correction; consolidation |
| Uses TADs | no |
Power chain (elastic chain) is a series of polyurethane ligature modules connected in a continuous strand. When stretched between two brackets or hooks, it contracts to apply a closing force. Three configurations are standard: closed (modules touching — ~3.5 mm center-to-center), short (one link gap — ~5 mm), and long (two link gaps — ~6.5 mm). Used for: closing extraction spaces, correcting rotations, consolidating spaces after initial leveling, closing anterior diastemas. Force decays significantly over the first 24 hours and continues to decrease over 3–4 weeks — hence replacement at each adjustment visit. NiTi closed coil springs provide more constant force for extended periods as an alternative.
Power chain is a series of elastomeric rings connected in a continuous chain. Stretched over brackets between the anterior and posterior segments, the chain's elasticity creates a continuous retracting force that closes spaces as the links shorten toward their natural length. The practical advantage over coil springs is ease of placement — a clinician can string a power chain across an entire arch in seconds.
Residual space closure after extraction: Power chain is most commonly applied after the main bulk of extraction space has been closed with coil springs or sliding mechanics, to close the final 1–2 mm of residual spacing.
Diastema closure: Anterior spacing can be closed with a short segment of power chain across two or more teeth.
Rotational correction: A single link of power chain from one wing of a bracket to an adjacent bracket creates a derotating couple.
Power chain force degrades rapidly — approximately 50–70% within the first 24 hours, stabilizing thereafter. Different configurations deliver different force: closed (no gap between rings) > short (one gap) > long (two gaps). By the time of the next appointment (4–6 weeks), active force from power chain is minimal, which is why many clinicians replace it at every visit.
Closed configuration for maximum initial force (heavy crowding, rotation). Short or long for lighter, more sustained force. Color-matched chains improve aesthetics in visible segments. Latex-free options are available for patients with latex sensitivity.
Power chain is not reliable for precision mechanics — the rapid force decay makes it unsuitable for cases requiring consistent, controlled force. It significantly increases plaque accumulation along the gingival margin and is contraindicated in patients with poor oral hygiene or active periodontal disease.
No lab fabrication. Manufactured product; placed chairside.
Appliances that incorporate this component. ★ = fabricated by Clear Fusion Lab.
length; for rapid space closure
finishing and consolidation
increases friction and force simultaneously
of arch/segment; same mechanics as natural
force alternative to chain; used for fine space closure
Orthodontics](https://www.americanortho.com/product-category/elastics/)