Harvold Activator.

Labial view of the Harvold Activator appliance. Also showing labial Bow in 0.8mm S.S wire.

Buccal view of the Harvold Activator appliance. The 'shaded' area is the 'molar covering'.

Occlusal view of the relief areas of the Harvold Activator upper and lower models. Picture shows palatal, lingual relief and molar coverage. N.B. The tips of the cusps of the fully erupted teeth should be just visible and level with the relief material used.

Buccal view of the Harvold Activator appliance.