. The science and practice of dental surgery. isspur to a suitable fixed point in theloA\er ja\\, which may be a single tooth,more than one tooth, or the bow itself,according to the resistance required. (rf) If the first upper premolar hasto be moved forward, and there is aspace between it and the first permanentmolar, which is to be occupied by thesecond premolar later, a tiny jack-screwmay be fitted between the two teeth ; thepremolar will move, ceteris paribus, asit offers the less resistance. The jack-screw may be attached to a plain bandon the premolar. To this band is soldereda piece of
. The science and practice of dental surgery. isspur to a suitable fixed point in theloA\er ja\\, which may be a single tooth,more than one tooth, or the bow itself,according to the resistance required. (rf) If the first upper premolar hasto be moved forward, and there is aspace between it and the first permanentmolar, which is to be occupied by thesecond premolar later, a tiny jack-screwmay be fitted between the two teeth ; thepremolar will move, ceteris paribus, asit offers the less resistance. The jack-screw may be attached to a plain bandon the premolar. To this band is soldereda piece of threaded \\ire, which ^^ill justoccupy the space between it and themolar. A nut is put on this threadedwire, and left just short enough toenable the band to be cemented inposition. Then the nut is turned againstthe molar, and the space enlarged in thisway. Methods (a) and (c) may be usedin conjunction with this one. (2) Removable Appliances.—-Coil-springs on a vulcanite plate offer the most suit-able means of bringing about medial movement. Fig. 323.—Lingual movement of a premolar by fixed appliances. A. Wire bow in position; second premolar and canine requiringbuccal movement. (a) Wire bow. (b) Ligatures for buccal movement of canine and secondpremolar. (c) Rubber wedge between bow and first premolar to bringabout lingual movement of the latter. Notice that the clamp-band {</) has had to be applied with theclamping wire directed distally, as the position of the secondpremolar prevents its proper adjustment. B. Lingual wire (it) attached to plain bands (e) on the lateral andmolar; the wire has a spur (/) to be engaged by theligature (6), the repeated tightening of which moves thepremolar. The anchorage is reinforced simple, and isobtained from the lateral, canine, second premolar, andmolar, tluough the lingual wire. C. Appliance similar to B, but ancliorage is from the canineand second premolar only. D. Appliance similar to C, but the lingual wire is extendedto the molar
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
