Bonding with a composite resin is strongly recomended for all appliances, where larger forces are transferred to the molars, such as with a TADMAN Hybrid Hyrax.
Since the shells are made from metal, it is necessary to apply a metal primer (e.g. Reliance Metal Primer®, or equivalent) to the inner surface of the shells.
Apply the bonding primer and a thin layer of composite to the inner surface of the shells. Of course, the molares are also coated with the bonding primer.the