Apparatus for preparing upper and lower jaw full prostheses, the apparatus comprising:
- p1 (a) an instrument holder comprising a baseplate, two upright pillars mounted on the baseplate and a support arm mounted between the two pillars for pivotal movement about a generally horizontal axis;
- (b) a support platform for a jaw model supported on the baseplate of the instrument holder and including means by which the height and inclination of the support platform with respect to the baseplate can be adjusted;
- (c) a lower jaw alignment member for determining the symphysis and trigoni points of the jaw model detachably supported by the pillars in a position above the said support platform, a stylus carried by the alignment member, means for adjusting the height of the stylus with respect to the symphysis point of the jaw model, a template for determining the trigoni of the jaw model carried by the alignment member, and means for adjusting the horizontal position of the template with respect to the alignment member to determine the trigoni;
- (d) a second lower jaw alignment member selectively mounted by means of an adapter onto the support arm of the instrument holder, means for adjusting the height of the second alignment member with respect to the symphysis point of the jaw model, a template supported by the second alignment member, and means for adjusting the horizontal position of the template with respect to the second alignment member to determine the trigoni;
- (e) an impression plate selectively mounted by means of an adapter onto the support arm of the instrument holder for lower and/or upper jaw models;
- (f) a mounting plate selectively mounted by means of an adapter onto the support arm of the instrument holder for lower and/or upper jaw models;
- (g) an upper jaw model alignment plate selectively mounted by means of an adapter onto the support arm of the instrument holder, a stylus carried by the upper jaw model alignment plate, means carried by the upper jaw model which includes a guide edge whose position can be adjusted to the hard palate of the upper jaw model;
- (h) a setting aid for enabling correct positioning of teeth in lower jaw full prostheses selectively mounted by means of an adapter onto the support arm of the instrument holder, the setting aid including a dome-shaped mount including means by which it can be fixed in a position opposite to a lower jaw model with sagittal and transverse compensation curve, and two pivotably mounted inserts lockable within the dome of the mount for adjustment of the central fissure line;
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- (i) a tooth template selectively carried by the setting aid and comprising a dummy tooth formed with an insert arm whose position can be adjusted and locked in a position opposite to a lower jaw model with the mesial edge of the dummy tooth aligned in a sagittal direction on a centreline of the mount.