Page 138 - My FlipBook

Fig. 67. A bicuspid split mesio-distally through an area of decay and photographed before sepa-
rating the halves. When these are opened like a book, the penetration of the decay will be disclosed.
These cuts have been made for the illustrations in an especially arranged lathe, in which the tooth is
mounted on a slide rest. The cutting is done with a rapidly revolving aluminum disk, twenty-six gauge
(thirty-two gauge may be used) charged with carborundum powder mixed with soapy water. With
this, slices 1-100 of an inch thick may be cut.