| Field | Value |
|---|---|
| ID | OA-0190 |
| Type | component |
| Category | component |
| Fixed/removable | fixed (placed chairside) |
| Primary function | high-strength archwire retention; figure-8 ligation; passive cinching |
| Uses TADs | no |
Steel ligatures (wire ties) are 0.009"–0.010" SS wire segments twisted around the bracket tie-wings with ligature tweezers or a ligation tool. They provide a more rigid, low-friction connection between the archwire and bracket compared to elastic modules. Used for: finishing mechanics where minimal friction is desired, figure-8 ligation to close spaces between brackets, cinching the distal archwire end behind the last molar bracket, and securing archwires in cases where elastic modules repeatedly debond. Also used for TAD attachments and auxiliary spring connections.
Steel ligatures serve the same function as elastomeric modules — securing the archwire in the bracket slot — but with significantly lower friction. This makes them the preferred choice during space closure stages where sliding mechanics are used, and in any stage where precise, full bracket engagement is required.
Steel ligatures are tied directly around the archwire and bracket wings using ligature-tying pliers or a director. The standard tie is a simple wrap around both wings (passive tie). A figure-8 configuration, where the wire crosses over the bracket between the wings, cinches the archwire more tightly into the slot for maximum engagement — useful when full torque expression is needed or when a tooth is resistant to rotation.
In lingual orthodontics, steel ligatures are used almost exclusively because the fine tolerances of lingual bracket slots demand precise archwire seating that elastomeric modules cannot reliably provide.
0.009" ligature wire is standard. 0.010" is used when extra strength is needed (e.g., heavy rectangular SS archwires in fully engaged lingual brackets). Pre-cut ligatures are available for efficiency; spooled wire allows custom lengths.
Wire ends must be tucked cleanly — uncut or improperly cinched ends are a common cause of soft tissue laceration. More technique-sensitive and slower to place than elastomeric modules. Not suitable for practices using heavy rotation of clinical staff who are not trained in steel ligation.
No lab fabrication. Manufactured product (pre-cut lengths from spool).
Appliances that incorporate this component. ★ = fabricated by Clear Fusion Lab.
dimensions; faster to place than custom bent
distal bracket; prevents archwire end from poking
brackets (figure-8 or single-pass); used for sectional arch stabilization
heavier-force applications
elastic attachment — combines ligature and hook function
Orthodontics](https://www.americanortho.com/product-category/ligatures/)