A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . he upper teeth and the general correctionof the malocclusion had progressed quite favorably, and fearing to trust to othersin this advanced stage the treatment adjustments, the author decided to place thebodily working-retainer on the upper incisors which would continue more slowlybut safely their bodily movement. Fig. 115 shows two views of the working-retainer on the model of the upperteeth at this time. The lingual push bars are No. 19 spring nickel silver, fittedbut not sold
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . he upper teeth and the general correctionof the malocclusion had progressed quite favorably, and fearing to trust to othersin this advanced stage the treatment adjustments, the author decided to place thebodily working-retainer on the upper incisors which would continue more slowlybut safely their bodily movement. Fig. 115 shows two views of the working-retainer on the model of the upperteeth at this time. The lingual push bars are No. 19 spring nickel silver, fittedbut not soldered into the thick wall clasp-metal tubes which are attached to theclasp-metal reinforcement-backing of the retainer. The distal ends of the bars atequilibrium are about ^ of an inch below the occlusal plane, and when spning 176 PART V. PRIMARY PRINCIPLES OF PRACTICE into the U or open-tube attachments on the Ungual surfaces of the stationaryanchorages, they exert a labial force upon the roots of the incisors; this, in con-nection with the action of the nuts at the mesial ends of the anchorage tubes, Fig. results in a bodily labial movement. Tiie open sides of the tubes cannot be seenin the illustration because they are turned toward the roof of the mouth; this causesthe spring bars to be locked in place without closing the tubes. Fig. 116.
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Keywords: ., bookcentury1900, bookdecade1920, bookidpracticaltre, bookyear1921
