The acrylic-faced cast gold crown

Abstract

Because of the adaptability of acrylic material, its application has been vastly broadened, particularly in its use as a processed facing in the anterior cast gold crown. A method has been outlined to provide adequate and safe retention of the acrylic in the window of a cast gold crown. New techniques have been offered to assure improved esthetic results by: (1) the use of oxyphosphate of zinc cement powder mixed with acrylic powder as a masking material; (2) the introduction of flash gold-plating hard cast alloys to provide a suitable color reflection background for the translucent acrylic material. Variation of the gold background can supply a range of colors by reproducing a gray, yellow, or red modification of any set of acrylic powders used. The opaque medium of cement furnishes a guide for the roentgenographic interpretation of acrylic margin in relation to tooth structure. Technical difficulties inherent in the finishing and cementation procedures have been discussed. The need for understanding and clarifying the vulnerability of this material, in regard to the daily routine of tooth brushing as well as abnormal tooth habits, has been stressed.