A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . s employed in this case, in addition to the apparatuson the upper for bodily labial movement of the inci-sors. It illustrates the principle of sustained anchor-ages which is fully defined and illustrated in ChapterXV. This was demanded because of the necessity ofreinforcing the stability of single molar anchorageson each side. The lingual arch-bow resting in theincisor hooks easily glides into the long-bearing tubeswith firmly sustained attachments to heavy molarbands. The labia
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . s employed in this case, in addition to the apparatuson the upper for bodily labial movement of the inci-sors. It illustrates the principle of sustained anchor-ages which is fully defined and illustrated in ChapterXV. This was demanded because of the necessity ofreinforcing the stability of single molar anchorageson each side. The lingual arch-bow resting in theincisor hooks easily glides into the long-bearing tubeswith firmly sustained attachments to heavy molarbands. The labial arch-bow No. 22 or 23 is sustainedon the incisors by open tube attachments (not shown by the engraver). It can beseen that the lingual force exerted by this bow upon the incisors cannot possiblytip the molars forward or rotate them on account of the long-bearing lingual tubes,so long as the bands remain firmly cemented to the teeth; consequently, if themolars move at all it must be a bodily movement, which means that their stationaryanchorage stability is greatly increased. The more modem root-wise buccal an-. 316 PART VI. DENTO-FACIAL MALOCCLUSIONS chorage tubes for the retruding arch-bow increases the mechanical advantage byreducing the strain of the band attachments to the molars, as the force wouldthen be exerted nearer the center of resistance to root movements. It will be seen that the reaction of the sustaining power of the lingual arch-bow on the molars is exerted as an intrusive force upon the incisors, which in thiscase is very desirable. In the preliminary assembling of this apparatus, place theincisor bands first, and then place the molars with the lingual bow in the that the bow glides easily in the tubes so that the retrusive movement of theincisors with the intermaxillary force and labial traction bow is not obstructed. In connection with the retrusive force of the arch-bow upon the incisors, thedisto-mesial intermaxillary force is an important auxili
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Keywords: ., bookcentury1900, bookdecade1920, bookidpracticaltre, bookyear1921
