A practical treatise on artificial crown- and bridge-work . red, extends at the palatal side a little below the lineof the gum (A) at the point B. A plate tooth(C) is ground and fitted to the root. An iridio-platinum post is then fitted to the root, flattenedslightly and bent at D, and riveted to the proper alignments of the tooth and post tothe root are then obtained, and they are investedand the post soldered and strengthened at thepoint D. The backing is then grooved andnotched slightly, wax applied, the crown ad-justed to the root, and the wax shaped so as to a\form a foundation
A practical treatise on artificial crown- and bridge-work . red, extends at the palatal side a little below the lineof the gum (A) at the point B. A plate tooth(C) is ground and fitted to the root. An iridio-platinum post is then fitted to the root, flattenedslightly and bent at D, and riveted to the proper alignments of the tooth and post tothe root are then obtained, and they are investedand the post soldered and strengthened at thepoint D. The backing is then grooved andnotched slightly, wax applied, the crown ad-justed to the root, and the wax shaped so as to a\form a foundation and overlapping edge at thepalatal portion (E). The crown is then re-moved, invested in a flask, packed with rubber,and vulcanized. In trimming and finishing,the rubber is allowed to form a partial band orcollar around the palatal portion of the root,where it will not show. It is then cemented on to the root withoxyphosithato. The Weston crown and the four-pin How crowns have advan-tages over ordinary plato tectii in the construction of this styleof 81 THE GOLD SYSTEM. CHAPTER V. PORCELAIN AND GOLD CROWN WITHOUT A COLLAR. The root of a cuspid will be taken as a tj^pical case to illustratethe construction of this style of crown. The end of the root is prepared the same as for a porcelaincrown (Fig. 139). The root-canal is then uniformly enlarged areasonable distance up, with a drill which will tightly fit theopening. Into the canal, gauging its full diameter, is fitted a Fig. 139. Fig. 140. Fig. 141. Fio. 142. Fig. 143.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcrowns, bookyear1889
