. Orthodontia, or malposition of the human teeth; its prevention and remedy . inning, he would haveadvised non-interference until two years later when thecuspids would have been partially erupted, and more nearlyready to assume their places in the arch, as soon as roomwas provided. In this way the wearing of a retaining plate, to await thefull eruption of the cuspids, would have been avoided andthe case simplified. Prof. Angle has devised a neat and effective appliance,constructed entirely of metal, for the lateral expansion ofthe arch, as shown in Fig. 126. Like the Jackson appliances, it uti
. Orthodontia, or malposition of the human teeth; its prevention and remedy . inning, he would haveadvised non-interference until two years later when thecuspids would have been partially erupted, and more nearlyready to assume their places in the arch, as soon as roomwas provided. In this way the wearing of a retaining plate, to await thefull eruption of the cuspids, would have been avoided andthe case simplified. Prof. Angle has devised a neat and effective appliance,constructed entirely of metal, for the lateral expansion ofthe arch, as shown in Fig. 126. Like the Jackson appliances, it utilizes the principle of the Coffin spring withoutthe objectionable featuresof the rubber plate. Itcan be used in either theupper or lower arch andwhere no greater powerthan the spring affords isneeded, will prove veryefficient. As seen in the cut, a rubber ligature may be attached to the centre of the spring and be con- Laterai Expansion. (Angle) nected with any cross-bar appliance upon the incisors for drawing them inward when such additional movement is desired. Fig. CHAPTER VIII. PROTRUSION OF THE UPPER JAW. This deformity, so frequently met with in our day, notonly destroys all harmony of expression, but so stronglysuggests the facial characteristics of idiocy as to be particu-larly objectionable. Fig. 127 shows the relation of the teeth in outline andFig. 128 the facial expression. In the latter will be noticedthe conspicuousness of the superior incisors and the result-ant shortening of the upper lip. Fig. 127. Fig. 128.
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidorthodontiaormal00guil
