. A manual of mechanical dentistry and metallurgy . y make use of the Coffin split plate, but as far as pos-sible heavy, cumbersome appliances should be the neatest and most effective for this purpose arethose devised by Dr. Eugene Talbot and Prof. Angle. method is as follows :— A vulcanite plate is made to fit the teeth and alveolarprocess, and cut away so that the anterior parts extend farenough forward to enclose the teeth to be moved. See A piece of piano wire is bent into either of the formsshown in Fig. 99, wherein a is the coil and fixed point;b b, mo\
. A manual of mechanical dentistry and metallurgy . y make use of the Coffin split plate, but as far as pos-sible heavy, cumbersome appliances should be the neatest and most effective for this purpose arethose devised by Dr. Eugene Talbot and Prof. Angle. method is as follows :— A vulcanite plate is made to fit the teeth and alveolarprocess, and cut away so that the anterior parts extend farenough forward to enclose the teeth to be moved. See A piece of piano wire is bent into either of the formsshown in Fig. 99, wherein a is the coil and fixed point;b b, mo\able arms extending from a, and c c, movable arms OF DENTAL I RKl-J ;r I^AkniES. I4I cxleiuliiii; from b b. Groox-es arc cut iiiln the antcrioi andposterior parts of the plate to correspond with and receivethe points bb and cc. Holes are drilled at these points,and the wires tied to the rnhher plates. in order that tlieantericn- teeth may he moved with the greatest force, thearms are so adjusted that the o-reatest pressure is exerted. on the anterior parts of the plate. This appliance is readilyremoved for cleansing and returned to place by the Angles method utilizes the principle of the springwdthout the objectionable features of the rubber plate, com-bined wdth an expansion arch. Fig. loo show^s a com-plex case, necessitating force from several directions uponthe badly malposed teeth. The dental arch rec|uires widen-ing, the centrals and lateral incisors are to be carried for-ward and outward and rotated. It will be noticed that wdreligatures are looped over spurs or pins, w^hich have beensoldered to the lingual sides of the bands, nearly at thedistal angle, thus exerting a pressure as they are occasion-ally tightened by twdsting or renewal. This tends to rotatethe teeth, as well as move them forward and outw-ard intoharmony with the pattern of the expansion arch. The exactdirection of this force is controlled by little spurs attached 142 MECHANICAL
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