. Orthodontia, or malposition of the human teeth; its prevention and remedy . ^ with it any prospect of solid Coffin plate, with a very stiff piano-wire embeddedin it, will yield the greatest amount of spring power, butwhere this is insuffi-cient we must needsresort to the jack-screw in some- of itsforms. An appliance ofDr. Angles, as shownin Fig. 93, for forcingoutward a cuspid isneat, simple and ef-fective. The base of the Jack-Screw Moving Out Cuspid. (Angle.) jack-screw is soldered to a band encircling the opposite cus-pid and reinforced by a spur resting against the first bicus-
. Orthodontia, or malposition of the human teeth; its prevention and remedy . ^ with it any prospect of solid Coffin plate, with a very stiff piano-wire embeddedin it, will yield the greatest amount of spring power, butwhere this is insuffi-cient we must needsresort to the jack-screw in some- of itsforms. An appliance ofDr. Angles, as shownin Fig. 93, for forcingoutward a cuspid isneat, simple and ef-fective. The base of the Jack-Screw Moving Out Cuspid. (Angle.) jack-screw is soldered to a band encircling the opposite cus-pid and reinforced by a spur resting against the first bicus-pid, and also by the large traction screw which is hookedinto a pipe soldered to the labial surface of the band andpassing in front of the incisors through a tube soldered to aband on the labial surface of the lateral incisor, againstwhich the nut 150 ORTHODONTIA. In this case, the left central and lateral were moved for-ward in the line of the arch, thereby closing the spacebetween the centrals, and, at the same time, providing spacefor the out-moving cuspid. The large screw was beatenflat and polished before insertion. CHAPTER Y. MISPLACED BICUSPIDS. The bicuspid teeth, both superior and inferior, are oftenfound located outside or inside of the normal arcli line, buttheir nial-position is not of as frequent occurrence as that ofthe anterior teeth. Their position out of line, as in the case of most forms ofindividual irregularity, is due to lack of space or the crowd-ing of other teeth. Sometimes, through tardy eruption, theirspace in the arch has been encroached upon by the pressureof the erupting cuspids in front, as well as the forward-movingtendency of the molars. In such cases one or both of thebicuspids are compelled to assume a position outside orinside of the arch, the latter being the one they most com-monly take. Aga
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidorthodontiaormal00guil