DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing, FIG.
1 shows a tooth 1 the volume of which is defined by an occlusion surface 2 and lateral faces 3.
At its base, the tooth 1 is surrounded by the dentogingival junction 4.
The surface layer consists of the enamel 5 covering the dentin or ivory 6.
The roots of the tooth are fixed in the desmondontium 7, the upper part of parodontium of which ensures the junction with the gum at the level of the dentogingival junction 4.
The line 8 drawn in broken lines represents in general the subgingival level of the tooth which corresponds to the prosthesis shoulder.
To treat and crown this tooth, the dentist cuts a crown stump 9, depicted in FIG.
2, which he then covers over with a crown 10 shown in FIG.
3, of metal, a ceramic or other material.
The present invention relates both to the cutting of the sump 9 and to the fabrication of the crown 10 by machining its material.
In particular it will be apparent from the following detailed description that the fabrication of the crown 10 leads the prosthetist to define the outer profile 2' and 3' of the prosthesisor crown 10, corresponding to the shape of the occlusion surface 2 and the lateral faces 3 of the tooth 1, the inner profile 11 of the crown 10 intended to mate with the contour 12 of the stump 9 and the exact outline of the lower peripheral shoulder 13 of the crown 10, intended to fit precisely on the gingival shoulder 14 which the dental surgeon has cut around the base of the stump 9.
According to the present invention, and by means of an apparatus 15 shown in FIG.
4, the dental surgeon cuts the stump 9 and the gingival shoulder 14, indicated in FIG.
2, of the tooth 1 by using a rotary tool carrier 17 carrying an abrasive grinder-cutter 16 which can be of any known type or else may correspond to the novel grinders illustrated in FIGS.
26, 28, 29 or 30.
On the other hand, for machining the crown 10, the prosthetist uses rotary cutters of the type of those shown in FIGS
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