Abstract: A track system for a slidable tray of a dental instrument delivery system includes a stationary slide guide member, a movable slide body member and a floating bearing assembly interposed between these members in coupling arrangement.

Abstract: A dental instrument delivery system of the type in which hand pieces are stored at the front edge of an instrument deck and are connected to utilities by means of flexible tubes with coiled memories is provided with structure to contain and support the weight of the tubing. The hand pieces may be held by removable hangers of heat resistant material so that the hangers may be separately sterilized. The instrument deck may further be provided with a slidably mounted tray adapted for cantilever suspension from either side of the deck.

Abstract: A dental operating chair includes a movable back member which can be adjusted to position a patient in a substantially supine posture. Arcuately formed arm supports which curve toward the patient are removably secured along the opposite longitudinal sides of the back member to retain the arms of a patient proximate his body truck. The arm supports include means which permit them to pivot toward and away from the patient. The internal surfaces of the supports are shaped to clasp the patient's arms and the edges of the supports are shaped for easy contact by the body of a dentist to cause them to pivot toward the patient.