. Orthodontia, or malposition of the human teeth; its prevention and remedy . rfacesto receive the wire ^^- l^^- bow-spring(C) whichrests infront innotched projec-tions upon bands(A) cemented tothe central in-cisors. At thecentre of the bow-spring is soldereda short tube, hav-ing upon its labialsurface a roundedprojection to re-ceive the standard(cupped at its free end) of the long traction bar (E). Inuse, the clamp-bands (D) are attached to the anchor teethand the plain bands (A) cemented to the central bow-spring (C) is now placed in position. Occipital resistance is obtained by
. Orthodontia, or malposition of the human teeth; its prevention and remedy . rfacesto receive the wire ^^- l^^- bow-spring(C) whichrests infront innotched projec-tions upon bands(A) cemented tothe central in-cisors. At thecentre of the bow-spring is soldereda short tube, hav-ing upon its labialsurface a roundedprojection to re-ceive the standard(cupped at its free end) of the long traction bar (E). Inuse, the clamp-bands (D) are attached to the anchor teethand the plain bands (A) cemented to the central bow-spring (C) is now placed in position. Occipital resistance is obtained by means of a netted capfastened to a circle of wire fitted to the head, to which areattached rubber bands. When the cupped standard of thetraction bar has been placed over the central spur of thebow-spring, the rubber bands of the cap are drawn forwardand looped over the curved ends of the traction bar, asshown in Fig. 140. This cap, traction bar and rubberbands are worn only at night on account of their conspic-uousness. During the day, rubber rings (B) are caught over the. Angles Appliance for Reduction of Anterior Protrusion. 186 ORTHODONTIA. Fig. 140. tubes on the molar bands and secured by ligature to projec-tions on the bow-spring in the region of the cuspid teeth. The appliance in po-sition, as worn dur-ing the day, is illus-trated by Fig. reduction ofanterior protrusionwe are met with thedifficulty of retain-ing the resultsgained. Althoughthe posterior teethin many cases willnot furnish the re-sistance necessary fordrawing the anteriorteeth inward, theywill usually answerperfectly for re-taining themafterward. At-tachment can bemade to themeither by meansof a rubber platecovering theroof of themouth and ex-tending aroundtheir distal sur-faces in the formof a clasp, or bymeans of metalbands cemented to them. In the former case a small round
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidorthodontiaormal00guil
