Principles and practice of operative dentistry . r, because of the MANIPULATION AND INTRODUCTION OF PLASTIC FILLING-MATERIALS. 377 danger of displacing the cervical section of the filling while the other isbeing packed into position, and the greater difficulty of perfectly finish-ing the cervical portion after the entire filling has been completed. Flagg recommends in all of those fillings which are located in surfacesof the teeth exposed to view, and where any discoloration would be objec-tionable, wafering such fillings with facing alloy, composed of, rela-tively, silver 57, tin 35, gold 5,
Principles and practice of operative dentistry . r, because of the MANIPULATION AND INTRODUCTION OF PLASTIC FILLING-MATERIALS. 377 danger of displacing the cervical section of the filling while the other isbeing packed into position, and the greater difficulty of perfectly finish-ing the cervical portion after the entire filling has been completed. Flagg recommends in all of those fillings which are located in surfacesof the teeth exposed to view, and where any discoloration would be objec-tionable, wafering such fillings with facing alloy, composed of, rela-tively, silver 57, tin 35, gold 5, zinc 3, as this gives a more acceptable color. COPPEE AMALGAM. For the purpose of guarding and for submarine work in unexposedpositions, and in the molar teeth of little children, some of whom willnot tolerate the rubber dam or even a napkin, copper amalgam occupies ahigli position as a filling-material and a conserver of tooth-structure. Cavities prepared for this material require but slight retentive shapingto retain it in position. Fig. Heating-spoon. Ebony cone-socket handle, In preparing copper amalgam for introduction into a cavity, a cube ofthe material is placed in an iron spoon (Fig. 457), or grasped with a pairof pliers, and held above an alcohol or Bunsen flame until the mercuryshows itself in tiny globules upon the surface, when it is placed in a mor-tar, crushed and ground into a soft mass. The cavity, when possible, should be protected from moisture by adjust-ing a rubber dam or a napkin and sterilized. The amalgam is then intro-duced in small pieces, and packed by tamping or burnishing the materialagainst the walls of the cavity until it is full. The surface of the fillingmay be smoothed with a broad spatula or by wiping with pellets of cotton. Large cavities may be advantageously filled or lined with zinc oxy-phosphate cement for the lower two-thirds or three-fourths of the cavityand the filling finished with amalgam. This practice, however, is im-perative
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdentist, bookyear1920
