Page 179 - My FlipBook

CROWN- AND BRIDG1'>\\()RK. 167

Taking Measurement of the Root.—After the enamel
has l)cen thoroughly rcnioNcd, an accnnile measurement of
the neck of tlic root should be secured. Several instru-
ments have been de\-ised for this purpose. A simple form
of dentimeter is shown in Fig. 132. The wire is turned

Fir,. T ^1. ^A.

down to approximate the size of the root ; it is then
carefully slipped over the root and worked up under
the free margin of the gum. Slight traction is
now made upon loop by gently drawing upon the
dentimeter, at the same time twisting it between the
thumb and finger of the left hand ; this will give a
perfect twist and adaptation as shown in illustration.
Fig. 132.

Transferring Measurement to the Banding Material.—In
order to transfer this measurement accurately to the band-
ing material, cut the wire loop in the center and spread the
ends in opposite directions, as shown in Fig. 133. It is