A practical treatise on artificial crown- and bridge-work . oot-reamers (Fig. 102) and facers (Fig. 108) arevery desirable instruments. The ream-ers are made in three sizes to correspondwith the Logan pins. With a root-reamer of the appropriate size, the root-canal is enlarged to fit the pin along itswhole length, and so hold the crown firmly independeiitlii of thecement. With a root-facer a labial slope is given to the root-end,80 that the crown neck shall fit under the edge of the gum. shows the method and its result, and the cross-section showshow the cement incases the pin. The sui
A practical treatise on artificial crown- and bridge-work . oot-reamers (Fig. 102) and facers (Fig. 108) arevery desirable instruments. The ream-ers are made in three sizes to correspondwith the Logan pins. With a root-reamer of the appropriate size, the root-canal is enlarged to fit the pin along itswhole length, and so hold the crown firmly independeiitlii of thecement. With a root-facer a labial slope is given to the root-end,80 that the crown neck shall fit under the edge of the gum. shows the method and its result, and the cross-section showshow the cement incases the pin. The suitable preparation ofthe bifurcated roots of some bicuspids and of alj the molarsis a matter involving difliculties of an unusual character andrequiring good judgment. The feasibility of splitting the postof a Logan crown to adapt it to the bifurcated root of a bicuspidis shown by Figs. 91 and 92. This example directs attention tothe peculiar shape of the post, in which there is effected sucha distribution of the metal that its o-reatest strength is in the.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcrowns, bookyear1889
