. Orthodontia, or malposition of the human teeth; its prevention and remedy . ssume acrowded and irregular position. The fact that when bicuspids are out of line they arenearly always found to be inside of the arch seems tofavor the supposition that the irregularity has been broughtabout in the manner suggested. Early eruption of the cus-pids and tardy eruption of the bicuspids would also favorthe condition. 28 ORTHODONTIA. The assumption that bicuspids once in hne may beforced out of it by pressure exerted in tlie eruption of thesecond and third molars has httle to support it. Were thispossib
. Orthodontia, or malposition of the human teeth; its prevention and remedy . ssume acrowded and irregular position. The fact that when bicuspids are out of line they arenearly always found to be inside of the arch seems tofavor the supposition that the irregularity has been broughtabout in the manner suggested. Early eruption of the cus-pids and tardy eruption of the bicuspids would also favorthe condition. 28 ORTHODONTIA. The assumption that bicuspids once in hne may beforced out of it by pressure exerted in tlie eruption of thesecond and third molars has httle to support it. Were thispossible or probable the deformity would be more frequentlymet with. Fig. 6 is afair representation ofthis deformity. Bothsides of the arch arenot usually affectedto the same extent,and in some cases thetwo bicusi3ids on oneside occupy a posi-tion directly acrossthe arch, each onebeing partly turnedupon its axis. Thecondition is rarelymet with in the lower Fig. 6.—Saddle-Arch (Coleman). jaw, and is one, according to the authors observation, neverinherited, but always CHAPTER III. EVILS ASSOCIATED WITH IRREGULARITY. In order to properly appreciate the importance of cor-rection of irregularit}^ of the teeth, it will be well to con-sider in brief detail some of the more prominent evils asso-ciated with the condition. APPEARANCE MARRED. While this result is usually not the most important ofthose connected with irregularity, it is the one which mostgenerally induces the patient to apply for remedial treat-ment. The other evils may not be recognized, or may beconsidered of minor importance by the parent, but the ill-appearance of the child both attracts the attention andenlists the sympathy to such an extent as to create a desirefor its improvement. The external deformity caused by an irregularity will begreater or less according to its extent and location. If it beslight in character and located back of the cuspid teeth, itwill usually give no external evidence of its existen
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