Page 669 - My FlipBook

Vu,. 41S.

Fig. 417 shows the matrix heir] in position by the separator. This form, which is quite fully
explainer! by the illustration, is a good and efficient method of using the combination of the two
instruments. When the separator has been placeci on the teeth and tightened just enough to stay well
in place, the matrix is easily forced between tlie tootli and the eluws of the separator and is then
firmly held and tightened against the tootli. Or the matrix may be tied in place and the separator
applied later.
Fig. 418. When the filling has been placed and the occlusal surface trimmed to form, and some
time has been given for the amalgam filling to become hard, the separator is loosened and removed ;
then the ends of the matrix are straightened out to the buccal and lingual, as shown. The separator
is then replaced and tightened until the grasp of the two teeth on tlie matrix is loosened. The matrix
is then removed and the proximal portion of the filling trimmed to form. Finally the separator is
removed.