A practical treatise on mechanical dentistry . th is comparatively sound and un-broken, this may be most expeditiously ac-complished, and with less risk of injury tothe root, by cutting two parallel grooves, opposite each other, onthe labial and palatal surfaces, with a small circular saw, or a hardrubber or rubber and corundum disc. These grooves should becut through the enamel deep into the dentine. Then, with the excis-ing forceps, the cutting edges of which are placed in the grooves,,the crown is readily severed from the root. After the use of the disc and excising forceps, any remainingpo
A practical treatise on mechanical dentistry . th is comparatively sound and un-broken, this may be most expeditiously ac-complished, and with less risk of injury tothe root, by cutting two parallel grooves, opposite each other, onthe labial and palatal surfaces, with a small circular saw, or a hardrubber or rubber and corundum disc. These grooves should becut through the enamel deep into the dentine. Then, with the excis-ing forceps, the cutting edges of which are placed in the grooves,,the crown is readily severed from the root. After the use of the disc and excising forceps, any remainingportions projecting beyond the free margins of the gum should beremoved, and proper shape given to the end of the root. A flat-edged corundum stone or what are known as the Ottolengui rootfacers (Fig. 284) are the best for the purpose, and when in use thestones should be kept constantly wet and free from clogging par-ticles of tooth substance. The end of the root should be dresseddown, anteriorly, a little below the free margin of the gum, care. ARTIFICIAL CROWNS. 477 being taken not to cause unnecessary laceration; in this waythe artificial crown, when adjusted to the root, will unite sointimately with the gum in front, in ordinary cases, as to renderexposure unnecessary. The surface of the root prepared in thismanner will present a concavity corresponding with the festoon ofthe gum. If a living pulp remains in the root, it will not ordinarily bepracticable—unless there is partial obliteration and consequentrecession of the pulp cavity as the result of ossific deposits—eitherto cut off the tooth on a line with the gum, or even transversely, orto dress the root even with the gum, without inflicting insufferablepain. It will be necessary, therefore, under such circumstances,either to devitalize and extirpate the pulp through the cariousopening in the crown before the latter is removed, or, if not ex-posed by excising the tooth, through an opening into the pulp, madewith a dril
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectdentist, bookyear1903
