Estudo da degradação de elástico pesado extra-oral

Abstract

The aim of this study was to observe how long the elastic extra-oral maintains its strength. The elastic extra-oral Morelli were stretched at three different distances, 4 cm, 8 cm and 12 cm, and at each distance were stretched 10 elastics for 14 days, and measuring the immediately there under at baseline, after 24 hours , 48 hours, 72 hours, 7 days and 14 days. It was concluded that the largest loss of elastic force extra-oral occurred in the first 24 hours of distention, and this constant loss and lower in other measurements, which does not prevent the use of elastics during this time during orthodontic treatment.