title: Relaxation of orthodontic elastomeric chains and modules in vitro and in vivo.
abstract: Relaxation patterns for two orthodontic polyurethane-based elastics have been quantified in dry air and water bath environments and in vivo. Water bath simulation of in vivo behavior is apparently valid for up to a week following initial activation, but it becomes somewhat erroneous thereafter.
mesh_terms: D000293:Adolescent; D000388:Air; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002648:Child; D004548:Elasticity; D005260:Female; D006358:Hot Temperature; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D009967:Orthodontic Appliances; D011140:Polyurethanes / Q000592:standards; D013314:Stress, Mechanical; D014087:Tooth Movement Techniques / Q000295:instrumentation*; D014867:Water
chemical_list: D011140:Polyurethanes; D014867:Water