A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . the bow. The U-tube should be made of No. 28 gauge platinvmigold, or nickel silver, well reinforced with solder, as great rigidity is required toprevent the torsional force from opening the tube. The U-tubes are soldered tothe buccal surfaces of the molar bands, or preferably to root-wise anchorage attach-ments, so they will stand slightly inclined toward the median line. When one ofthe flattened ends of the arch-bow is placed in the lock-tube, as shown on the leftof Fig. 63, Ch
A practical treatise on the technics and principles of dental orthopedia and prosthetic correction of cleft palate . the bow. The U-tube should be made of No. 28 gauge platinvmigold, or nickel silver, well reinforced with solder, as great rigidity is required toprevent the torsional force from opening the tube. The U-tubes are soldered tothe buccal surfaces of the molar bands, or preferably to root-wise anchorage attach-ments, so they will stand slightly inclined toward the median line. When one ofthe flattened ends of the arch-bow is placed in the lock-tube, as shown on the leftof Fig. 63, Chapter XIV, the mere lifting of the other end to position twists the endthat is locked. In order to twist the other end of the bow before seating it in thelock-tube, it must be firmly grasped with suitable pliers and forcibly twisted toits locked position; this gives one something of an idea of the force of reactionexerted upon the roots of the teeth. The bow in the illustration has the appearanceof being flattened only at one end; this was the engravers error. CHAPTER XLIX. NARROW AND WIDE ARCHES 349 Fig. LiHGUAL SpRIKG EXPAlfDERS Laterally contracted arches are not uncommon with no other irregularityexcept that the front teeth are forced into a more or less protruded state,demanding an expansion of the buccal area to correct the front teeth and the occlusion of the back teeth. If the teeth do not require a bodily ex-panding movement, Fig. 248 illustrates oneof the most simple appliances in technicconstruction and future management. Thesizes of the lingual expanding bows rangefrom Nos. 18 to 16 spring nickel-silver object of employing a bow of a largesize is to obtain a more positive force to lowerthe range of its spring potentiaUty, and thusavoid the possibility of too much bow is fitted to lie evenly along the sur-faces of the teeth and conform to the domeof the arch. It is then spnmg outward to a point of equilibrium that is slightlybeyond the des
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