A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . rom the lingual or buccalaspect, shoiild be applied to the teeth throughthe medium of root-wise attachments, in orderto place the line of its directed force nearerto the center of alveolar resistance. This maybe accomplished by soldering root-wise exten-sions to the bands of the teeth which are chosento transmit this force. See Fig. 247; also seeAnchorages, Chapter the employment of any labio-buccal expansion arch-bow, it will be foundof great advantage to have an open anc
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . rom the lingual or buccalaspect, shoiild be applied to the teeth throughthe medium of root-wise attachments, in orderto place the line of its directed force nearerto the center of alveolar resistance. This maybe accomplished by soldering root-wise exten-sions to the bands of the teeth which are chosento transmit this force. See Fig. 247; also seeAnchorages, Chapter the employment of any labio-buccal expansion arch-bow, it will be foundof great advantage to have an open anchorage tube on one side, instead of bothbeing closed, or seamless. By placing one end of the spring bow in the closedtube, and then by springing the other end into its seating in the open-tube, thefull spring force of the bow is obtained. If necessary for greater security, it may belocked in place. One of the greatest advantages is: it enables an easy unlockingof the arch-bow for renewing its force, or changing it in any way. The openmouth of the tube should stand slightly inclined toward the gum, in order that. 348 PART VII. UNCLASSIFIED MALOCCLUSIONS the expanding force of the bow when sprung into it will firmly retain its seatingwithout otherwise locking it. This is especially important when plain bows—without nuts—are employed. When the expansion arch-bow is attached to single molar anchorages, themolar bands should always carry lingual yoke extensions, made of round or half-round wire fitted to the gingival margins of the adjoining teeth, to distribute theexpanding force. The bodily expanding property of an arch-bow can be further increased bytaking advantage of torsional force which may be imparted to the bow by givingto its ends a twisted spring force before locking them into their anchorage method is fully described in the chapter on Bodily Movement, and illustratedin Fig. 63, Chapter XIV. It was presented in a paper read before the AmericanSociety of Orth
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