. Orthodontia, or malposition of the human teeth; its prevention and remedy . ds. It will be noticed that in the operation of thisappliance any instanding teeth are moved outward into linebefore real expansion of the arch begins; if, therefore, themoving of individual teeth is alone desired, operations canbe suspended as soon as that object has been small size of the jack-screw in the Angle device isalso an element in its favor, since it will interfere less withthe movements of the tongue than the larger ones commonlyused. ^ In addition to the power of the jack-screw, it has t
. Orthodontia, or malposition of the human teeth; its prevention and remedy . ds. It will be noticed that in the operation of thisappliance any instanding teeth are moved outward into linebefore real expansion of the arch begins; if, therefore, themoving of individual teeth is alone desired, operations canbe suspended as soon as that object has been small size of the jack-screw in the Angle device isalso an element in its favor, since it will interfere less withthe movements of the tongue than the larger ones commonlyused. ^ In addition to the power of the jack-screw, it has thefurther advantage of rapidity of action; so that, if its i)Osi-tion in the mouth should somewhat inconvenience thepatient, it would do so only for a very short time. Dr. Jackson lias very ingeniously adapted his spring and crib methodto the moving , as shownin the followingillustrations:— Fig. 99 illus-trates his appli-ance for movingoutward two ^ * A base wireI is shaped to the 1 lingual side of theanterior teeth andanchored to the Fig. Spring and Crib Appliance. (Jackson.) bicuspids by means of single crib appliances. To each ofthese latter is attached a hook or eyelet to sustain a straightbar of spring wire that is sprung over the anterior this means the bicuspids may be moved outward andthe arch flattened in front at the same time when desired. * Denial Cosmos, Vol. XXXIII., p. 1077 et seq. 156 ORTHODONTIA. Fig. 100.
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