A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . on of the incisors,it will demand a lateral expansion inorder to place the teeth in alignment;moreover, this movement of one denturewill often demand the concomitant ex-pansion of the other, else the luicor-rected arch will force the other back toits former fixed occlusion. Fig. 237 shows a common methodof expanding the anterior arch as anauxihary to the labial or lingual curvedpush bars. The lingual bars No. 18 fordistributing the expanding force arethreaded at their extreme me
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . on of the incisors,it will demand a lateral expansion inorder to place the teeth in alignment;moreover, this movement of one denturewill often demand the concomitant ex-pansion of the other, else the luicor-rected arch will force the other back toits former fixed occlusion. Fig. 237 shows a common methodof expanding the anterior arch as anauxihary to the labial or lingual curvedpush bars. The lingual bars No. 18 fordistributing the expanding force arethreaded at their extreme mesial endsto screw into short threaded lingualtube attachments on the cuspids, orthey may be soft-soldered. The prin-cipal object of this method of attach-ment is to preserve the rigidity of thebars, which would not be possible ifhard-soldered directly to the distributing bars are bent to pass the premolars and to afford means of attach-ment to the bar-rest expanding jack. Their distal ends rest in seamless or open-tubeattachments on the molars, or they may be threaded to act as piill or push bars with. 336 PART VII. UNCLASSIFIED MALOCCLUSIONS nuts respectively distal or mesial to the molar tubes. The buccal molar tubes andcuspid open-tube attachments provide means for an alignment arch-bow if the lingual cuspid attachments are placed at the extreme gingival borders, thestraight jack will lie close to the lingual incisal ridge, and will thus not materiallyinterfere with the tongue. When necessary to place the jack further back, the arcjack will be found preferable. The lingual appliance for opening space for the Fig. 238. Fig. 239.
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Keywords: ., bookcentury1900, bookdecade1920, bookidpracticaltre, bookyear1921
