. Orthodontia, or malposition of the human teeth; its prevention and remedy . a different position. Another and very convenient way of lengthening thewires to follow the moving tooth, is to slip a section of plati-num or German silver tubing over the end of the wire andsoft-solder it in position. Where a tooth is to be pressed outward the wire is anchoredin the palatal jDortion of the plate, but where a tooth is tobe moved from without inward, the wire should be attachedto that portion of the plate covering the buccal surfaces ofthe molars. Rotation is accomplished by combining the two move-me
. Orthodontia, or malposition of the human teeth; its prevention and remedy . a different position. Another and very convenient way of lengthening thewires to follow the moving tooth, is to slip a section of plati-num or German silver tubing over the end of the wire andsoft-solder it in position. Where a tooth is to be pressed outward the wire is anchoredin the palatal jDortion of the plate, but where a tooth is tobe moved from without inward, the wire should be attachedto that portion of the plate covering the buccal surfaces ofthe molars. Rotation is accomplished by combining the two move-ments ; that is, by havingone wire on the palatinesurface to press againstone angle of the tooth, andanother on the buccal sur-face to press against theopposite angle. Two wires can be in-serted to operate on twoteeth at the same time,either in similar or oppo-site directions. Fig. 48 represents a plate made to press out-ward two lateral incisors. Many modifications of the Coffin plate have been devisedby different practitioners, some of which are shown inPart III. Fig. Coffin Solid Plate. MATERIALS AND METHODS. Ill The originator claims for his method and appUance, sim-plicity, ease of construction and inexpensiveness, almostuniversal range of application, perfect control of force appliedand direct action, comparative painlessness from non-irrita-tion of the soft tissues, perfect fixedness and least unsightli-ness, ease of removal for cleansing, and little interferencewith speech and mastication. Dr. E. S. Talbot has designed a modification of the Coffinpiano-wire spring, which consists in converting it into a coilat some point of its length, thus adding, it is claimed, greaterelasticity and a wider range of applicability. Unlike theCoffin spring it may be used without a rubber j)late andwithout being permanently attached to any appliance. Thecoil is formed by bending the wire around a mandril firmlydriven into the bench or properly secured in a vise. The arms may be bent o
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