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32 DENTAL ANATOMY
1. Longitudinal Sections.—Make one section by means op

the file from the labial, buccal or lingual, and one from the
mesial or distal aspect of the teeth selected by the teacher.

2. Transverse Sections.—Make by means of the saw a
transverse section at the cervical line and another at mid-root
of the upper and lower teeth selected.
I
Directions.— (i) For the Longitudinal Sections.— (a) Fix
the tooth on the wood block by means of melted sealing wax

Fig. 42.—Longitudinal section of Fig. 43.—Longitudinal section of
the upper central incisor, labial as- the lower central incisor, mesial as-
pect, mounted and annotated. pect, mounted and annotated.

and a wax spatula. For sections showing the labial or buccal
aspect of the chamber and canals, mount the tooth with the
lingual surface facing up. For those showing the mesial or"
distal aspect, mount the opposite surface facing up. (b) Fix

the block securely in the bench vise and file longitudinally at
an angle of 45 degrees until the pulp chamber is exposed, (c)
Then insert a smooth broach into the chamber and carry it the
full length of the canal through the apical foramen. File until