A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . xtraction of premolars, the labial retainer should carry No. 19 thin wall tubes soldered to the linguo-distal borders of the cuspid bands, as shown in Fig. 302, for the purpose of attaching the appliance to the molars, either at the start or upon the first indication of a return movement. The traction bars are No. 19 or 20 nickel-silver, and usually should be provided with mesial and distal nuts to firmly lock them in the lingual tubes attached to gold molar bands. This will ena
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . xtraction of premolars, the labial retainer should carry No. 19 thin wall tubes soldered to the linguo-distal borders of the cuspid bands, as shown in Fig. 302, for the purpose of attaching the appliance to the molars, either at the start or upon the first indication of a return movement. The traction bars are No. 19 or 20 nickel-silver, and usually should be provided with mesial and distal nuts to firmly lock them in the lingual tubes attached to gold molar bands. This will enable one to keep all interproximate spaces closed, and if at this time the occlusion is perfected it will be found sufficient. In many cases in which the age of the patient and position of the teeth, etc.,favor permanency of retention, the lingual bars and molar bands are not at firstattached, though the lingual cuspid tubes in these cases should always be placedon the retainer, to be employed if found necessary. The tubes being small, lyingclose to the gum and properly finished, give no irritation or Intermaxillary Retention In cases which are purely protrusions of the upper to the extent that the buccalcusps interdigitate fully the width of a premolar in front of a normal occlusion(such cases being usually corrected by the extraction of the first or second pre-molars), the buccal teeth may be forced slightly forward of an interdigitating oc-clusion if employed as the sole anchorage force for retruding the labial teeth, andif employed as the sole means of retention, will tend to be dragged further forwardby the reacting force of the front teeth. Or it may be one of the many cases inwhich the upper teeth in relation to the lower teeth were protruded—perhaps tothe extent of the full width of a premolar—but according to dento-facial rela-tions was found to be due partially or wholly toa retrusion of the lower denture, and conse-quently corrected without extraction.
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