Class II or Class III inter-maxillary elastics are often used to correct antero-posterior problems, and it is recommended that rectangular stainless steel wires should be in place when they are used. In ter-maxillary elastics can contribute (o the bite-opening effect by assisting in the extrusion of molars as the A/P problem is corrected (Fig. 6.19). They are beneficial in the treatment of most growing patients. If possible they should be avoided in most non-growing and adult high-angle cases.
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