A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . of resistance or weight, shown by the arrows. The bodily disto-mesial movement of buccal teeth to close spaces after extrac-tion so as to leave no inverted V-shaped interproximate space to pocket food is ofthe greatest importance. This is accomplished by ingenious devices for applyingthe power upon lingual and buccal root-wise extensions aided by an occlusal screw 116 PART IV. TECH NIC PRINCIPLES OF PRACTICE bar fulcrum resistance, or by long-bearing telescoping tubes at the occ
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . of resistance or weight, shown by the arrows. The bodily disto-mesial movement of buccal teeth to close spaces after extrac-tion so as to leave no inverted V-shaped interproximate space to pocket food is ofthe greatest importance. This is accomplished by ingenious devices for applyingthe power upon lingual and buccal root-wise extensions aided by an occlusal screw 116 PART IV. TECH NIC PRINCIPLES OF PRACTICE bar fulcrum resistance, or by long-bearing telescoping tubes at the occlusal Stationary Anchorages, Chapter XV, and the closing of Abnormal Inter-proximate Spaces, Chapter L. Also see Figs. 266 and 268, Chapter L; and Chapter XXIX. The ordinary methods of expanding narrow dental arches, are by spring arch-bows, or lingual jacks, the forces of which being applied upon the crowns in a buccaldirection, produce purely an inclination movement, with the result that the teethsoon close only on the lingual cusps, and this tends to drive them back to their form- FiG. er malpositions, unless positively retained. Therefore, except in those cases wherethe buccal teeth are lingually inclined, there should always be an endeavor to producea bodily buccal movement. One of the most practical aids toward this movementis the root-wise extensions soldered to the buccal surfaces of the bands. To these,the open-tube attachments are soldered to the extreme root-wise positions permittedby the muscles. When high-grade spring arch-bows No. 18 or 17 are sprunginto these tubes, the line of force is far nearer to the center of alveolar resistance inthe sockets, and consequently with a greatly increased tendency toward bodilyexpanding movement. It very commonly arises that this expansion arch-bow is threaded at the endsfor nuts, to exert distal or mesial force; the ends resting in open-tubes, which maybe partially closed after placing the bow. The bow ca
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