How does the diameter of the orthodontic elastic affect the force level it delivers?

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Travis Lawrence Gibson

Conventionally, the force listed for a given elastic is with reference to when it is stretched over a distance of 3x the diameter. For example, your 3/16" 6 oz elastic should deliver 6 oz of force when stretched between two points 9/16" (~15 mm) apart. The 1/4" would deliver the same amount of force at 12/16" (~19 mm).

However, research shows that there is a wide variability in the actual force delivered. For example, see:

Pakhan Kanchana, Keith Godfrey, Calibration of force extension and force degradation characteristics of orthodontic latex elastics, American Journal of Orthodontics and Dentofacial Orthopedics, Volume 118, Issue 3, September 2000, Pages 280-287

Manish Bajracharya

I think its always better to measure the force level with gauze in order to have an idea regarding the force level because there is wide variation in different elastics available.

Pedro Oliveira

The force described in the package typically corresponds to stretching the elastic 3x in relation to its diameter. However, the most recommended is to measure the force of the elastic in the mouth.