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Results There were significant differences among the groups in all evaluated stretches (15, 20, 25, and 30 mm). The control elastics presented higher average forces numerically and statistically significant for all tested times, except for the elastic used for 1h. The elastics used for 1, 12, and 24h had similar forces among them, with a significant difference to the elastics used for 48h. Conclusion It is recommended to change the intermaxillary elastics after 24 h of use. © Copyright 2019 by Turkish Orthodontic Society.The Internationa