Dental cosmos . made from any thin metal, preferablyGerman silver, as it reflects the light. It shouldbe 26-gauge, bent to fit the tooth and cut to fit the festoon of thegum, with an ear on the outer edge to prevent its impinging onthe gum. This matrix can be satisfactorily held in either of twoways: one the method of Dr. J. A. Woodward, described in theDental Cosmos, 1885, page 335, consists in cutting longitudinalgrooves on the back of the matrix to act as guides to the wedges;the other method is by the use of the Perry separator, which isperhaps the simplest, quickest, and best way of secur
Dental cosmos . made from any thin metal, preferablyGerman silver, as it reflects the light. It shouldbe 26-gauge, bent to fit the tooth and cut to fit the festoon of thegum, with an ear on the outer edge to prevent its impinging onthe gum. This matrix can be satisfactorily held in either of twoways: one the method of Dr. J. A. Woodward, described in theDental Cosmos, 1885, page 335, consists in cutting longitudinalgrooves on the back of the matrix to act as guides to the wedges;the other method is by the use of the Perry separator, which isperhaps the simplest, quickest, and best way of securing the matrixfirmly in place. Figs. 1 and 2 show the two methods. An advantagesecured by this separator is that at any time during the operation thespace can be immediately widened and the matrix spread by conden-sing the gold more firmly against it, thus permitting an increase ofcontour. When the rubber-dam is used, the matrix may be removedand the edges of the filling be examined before replacing the 9G1 THE DENTAL COSMOS. After final removal of the matrix, the separator can be applied andsufficient space gained for finishing. The filling should be commencedwith large pieces of soft gold. lie usually employs soft gold untilabout two-thirds of the cavity is filled, and finishes with flexibility of the matrix will allow the soft gold to come overthe edges, leaving a surplus for finishing. He considers the matrixeven more valuable in the use of plastics than with gold. An amal-gam contour can be made and the matrix be left in place untilanother sitting for finishing. Dr. C. S. Beck, of Wilkes-Barre, Pa., said he used matrices innearly all approximal surfaces to be filled either with gold or amal-gam. Their use lessens the sacrifice of tooth-structure in suchcases. He thinks that only soft gold should be used with matrices;generally makes his own matrices of German silver, making thecontour with contouring pliers. Dr. J. G. Templeton said that a very good f
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