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258 TECHNIC COURSE FOR STUDENTS
Fig. 292.—Same model as shown in Fig. 291 carrying teeth with typical cavity
preparations.
Fig. 293.—Dr. H. Gale Atwater's model and instruments. Both are made to
Black's measurements, 25 diameters. A model of the lower teeth, not shown, is
also used. In the illustration, ideal cavity forms have been completed. Enlarged
matrices may be seen to the right of the picture.
