A practical treatise on artificial crown- and bridge-work . SHAPING TEETH AND KOOTS FOR CBOWN-W The principles governing the process of shaping/a naturalcrown or root for any style of artificial crown with a collarattachment require that the cervical portion of the natural crownand root shall he given a form that has longitudinally-parallelsides gauged to the line of the periphery of that part, and thatany of the coronal sedtion present below it shall be reduced atleast sufficiently in size to come within this line. Such a formis necessary to admit of a perfect adaptation of the collar. The co
A practical treatise on artificial crown- and bridge-work . SHAPING TEETH AND KOOTS FOR CBOWN-W The principles governing the process of shaping/a naturalcrown or root for any style of artificial crown with a collarattachment require that the cervical portion of the natural crownand root shall he given a form that has longitudinally-parallelsides gauged to the line of the periphery of that part, and thatany of the coronal sedtion present below it shall be reduced atleast sufficiently in size to come within this line. Such a formis necessary to admit of a perfect adaptation of the collar. The coronal section of a natural crown to he prepared isusually first ground on the occluding surface with as large acorundum-wheel as the case will conveniently admit (Fig. 10).. Molars and bicuspids for all-gold crowns should have enoughsubstance removed to make a small space between them andthe antagonizing teeth, i The approximal surfaces are removedstraight from the cervical border to the occluding surface, usingdiamond or rubber and corundum disks. (Fig. 11) and files, andlast of all, as injury to the approximal teeth is then more easilyavoided, the labial and palatal portions, for which small corun-dum points (Fig. 12) and wheels are best adapted. The cornersare then rounded. The cervical portion, which includes thejunction of the dentineaud enamel, is trimmed so that illustrated at A, Fig. 13, are level and parallel with the 39 40 ARTIFICIAL CROWN- AND BRIDGE-WORK. line of the root, and as deep as the collar is to be placed (Fig. 14).For this purpose, small corundum points, trimmers, and files canbe used. Fig. 15 illustrates a drill, which in the ordinary hand- Fig. 12. Fig. 11
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherphila, bookyear1889
