Page 143 - My FlipBook

THE MATRDC III

one hole, then along the length of the band, and back through
the other hole. Place the band in position and tie to place,
wrapping the ligature around the tooth several times if
necessary.

4. Wedged Matrix.—Cut a piece of band metal of proper
shape to supply the missing wall, and after ligating, wedge to
place in the inter-proximal space with orange wood, to gain
separation.
Matrices are essential for the proper introduction of

amalgam, cement (including silicate) and gutta-percha into
proximal cavities. Some operators use them for gold fillings,
starting on the gingival wall with non-cohesive gold, but
this method is not recommended by the author. Whenever
the matrix is used, separation of the teeth is desirable, to

allow for the space occupied by the matrix band, so that
contact points may be restored and knuckled. For this
purpose a small wooden wedge is valuable.

TECHNICAL EXERCISES

1. Apply the rapid separator in several localities on the
typodont or other technic block.

2. Trim several wooden wedges and produce separation in
different localities on the technic block.
3. Apply cotton rolls and napkins with the cotton-roll
clamp to the technic block.

4. Adjust the rubber cloth in several localities on the
technic form, with the use of ligatures and clamps.
5. Adjust the matrix to several teeth on the technic
form.