Abstract: The invention relates to a dentist chair with a chair top carrying at least a chair seat. A chair bottom contains a height-adjusting system for the chair top, and at least one apparatus adaptable at the chair bottom which requires various supplies, such as air, water, electric current, which by means of supply lines are brought into the apparatus through the chair bottom from a connection box at the floor. For hookup of the apparatus the chair bottom contains a hookup portion which contains coupling means both for mechanical coupling and for coupling of the various other supply lines. The apparatus is connectible to the supply lines through a counter-piece which matches the hookup portion of the chair bottom and which, for mechanical coupling of the apparatus contains counter-coupling means which can be brought into engagement with the coupling means and which then establishes the proper required connection.