PCT No. PCT/EP93/00134 Sec. 371 Date Oct. 7, 1993 Sec. 102(e) Date Oct. 7, 1993 PCT Filed Jan. 21, 1993 PCT Pub. No. WO93/16458 PCT Pub. Date Aug. 19, 1993.In a training and practice apparatus (1) for simulating and practicing clinical dental processes and for carrying out technical dental work, with a liquid extraction device (17) and a solids extraction device (14), a common vacuum source (25) is provided for both extraction devices (14, 17), with a suction line section (26) which branches at a branch (27) with two suction line branches (28, 29) to the extraction devices (14, 17), a change-over device (37) being arranged in the area of the branch (27) to open the one suction line branch and simultaneously close the other suction line branch (28, 29).
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