A practical treatise on mechanical dentistry . (470) August, 3. CORRECTION OF DENTAL IRREGULARITIES. 471 in the general movement of the parts, must be sustained by theanchorage teeth, if not further neutralized by other auxiliaries. When the central features of the face are depressed, with anteriorsuperior teeth occluding posteriorly to the lowers, accompaniedwith the usual real or apparent prognathous lower jaw, great re-ciprocating force may be beneficially obtained from the rubberbands before mentioned. Rubber rings are cut from a ^ of aninch rubber regulating tube of good heft, a
A practical treatise on mechanical dentistry . (470) August, 3. CORRECTION OF DENTAL IRREGULARITIES. 471 in the general movement of the parts, must be sustained by theanchorage teeth, if not further neutralized by other auxiliaries. When the central features of the face are depressed, with anteriorsuperior teeth occluding posteriorly to the lowers, accompaniedwith the usual real or apparent prognathous lower jaw, great re-ciprocating force may be beneficially obtained from the rubberbands before mentioned. Rubber rings are cut from a ^ of aninch rubber regulating tube of good heft, and passed over the pro-jecting ends of the anchorage tubes on the upper appliance tobuttons on a lower appliance, opposite the first bicuspids. The Fig. 282. Fig. April, 1893. August, 1893. Case 3.—In this case the roots, as well as the crowns, of the superior incisorshave been forced to a more posterior position, reducing the prominence of thenasal spine of the superior maxillary and an exceedingly unpleasant fullnessof the upper lip where it merges into the nasal septum. See Figs. 280 and281. latter appliance may be so constructed that the force will be dis-tributed to all the inferior teeth, and indirectly to the jaw, forcingit to a more posterior position. Or it may be that the first bicus-pids have been extracted, as in Case I, for the purpose of forcingthe six anterior teeth back. In either case the elastic force of therubber bands can be made to do effective work to the full extentof their power on both the upper and lower jaws, neutralizing forcewhich otherwise would be expended upon a static anchorage. Inwriting of this apparatus, Dr. Case says: They are useful also as an auxiliary to the reduction of a prog- 472 MECHANICAL DENTISTRY
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