Abstract: An apparatus for the simultaneous measurement and remote recordation of the depth of the gingival sulci and other similar anatomical recesses. The apparatus comprises a periodontal depth probe with a protruding, removably-attached cylindrical probe tip partially ensheathed by a slideable tubular sleeve which is electrically connected via a transducer within the probe body to a remote recording device. Translational movement of the slideable tubular sleeve partially sheathing the probe tip varies an electrical signal between the probe and the remote recording device according to the length of probe tip exposed. An operator-controlled foot switch is connected between the probe and the remote recording device to allow the operator to insert the probe tip into the gingival sulcus and adjust the slideable sleeve until it touches the margin of the gingiva before actuating the remote recording device.

Abstract: A training machine for intra-oral instrumentation for dental treatment which comprises a plate carrying an electrically conductive path on the surface thereof; an imitation dental instrument with an imitation dental tool detachably attached thereto, so that a trainee traces said conductive path with said tool; and means for measuring the time during which said conductive path is being traced with said tool. A shield is attachable to the machine so that the trainee can look at the pattern of the conductive path either directly without the shield or only through a mirror with the shield attached to the machine.