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permanent set

   Also found in: Dictionary/thesaurus 0.01 sec.
permanent set [′pər·mə·nənt ′set]
(mechanics)
Permanent plastic deformation of a structure or a test piece after removal of the applied load. Also known as set.

permanent set
The change in length (expressed as a percentage of the original length) by which an elastic material fails to return to original length after being stressed for a standard period of time. Also See set.


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Using robots for the task has two advantages: First, it's more accurate than having a human do it by hand; and second, only a machine can handle the 1,000-degree Fahrenheit temperature needed to give a permanent set to the bends that will guide the teeth into the final pattern that the orthodontist has determined, using the 3-D model.
Once the permanent set of teeth start coming in, many children need or want additional treatments such as braces or retainers to help guide teeth and make them straighter or ensure that they are spaced properly.
Robbie will continue to need replacement prosthetics until he is an adult, when a permanent set of legs could cost as much as pounds 20,000.
 
 
 
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