3M AlastiK Loose Modules, A-1 Dimension Ligatures
Loose elastomeric ligatures in A-1 dimensions with a 0.125 inch outer diameter, used to hold the archwire in orthodontic bracket slots.
2 millimetres. Orthodontists use loose ligatures like these to secure the archwire into each bracket slot during a fixed appliance treatment, stretching the small elastomeric ring over the bracket tie wings by hand or with a placement instrument. Being supplied loose rather than on a continuous chain gives the clinician flexibility to place a single ligature exactly where needed, which is the standard approach for most conventional, non self ligating bracket systems.
As a single-use consumable, each ligature is removed and replaced at every adjustment appointment, making this one of the highest turnover items in an orthodontic practice's ordering list. This listing is supplied under three catalog numbers, likely reflecting different colours or pack sizes of the same A-1 dimension module.
