. Orthodontia, or malposition of the human teeth; its prevention and remedy . PRINCIPLES INVOLVED. 19 Fig. 2 illustrates another case very similar in this instance the supernumerary tooth erupted to thePj^ 2 side of the median line, and so only theone incisor was de-flected from its nor-mal position. Sometimes the pres-ence of a supernum-erary tooth has nolif/i ^^^^^ effect upcm the /l\ M permanent set than -^-^ to occupy part of Torsion caused by Supernumerary. ^j^g spaCe ill tllC arch and separate the adjoining teeth by its own width.* Eventhis, however, is objectionaljle, for i
. Orthodontia, or malposition of the human teeth; its prevention and remedy . PRINCIPLES INVOLVED. 19 Fig. 2 illustrates another case very similar in this instance the supernumerary tooth erupted to thePj^ 2 side of the median line, and so only theone incisor was de-flected from its nor-mal position. Sometimes the pres-ence of a supernum-erary tooth has nolif/i ^^^^^ effect upcm the /l\ M permanent set than -^-^ to occupy part of Torsion caused by Supernumerary. ^j^g spaCe ill tllC arch and separate the adjoining teeth by its own width.* Eventhis, however, is objectionaljle, for in most cases the tooth,being abnormal in form, will have to be extracted and anattempt made to close the space thus ACCIDENTS. An accidental injury to one or more of the teeth of eitherset, whether resulting in their loss or not, is often respon-sible for an irregular condition. Should a deciduous toothbecome devitalized, as the result of an accident or othercause, and alveolar abscess supervene, the physiological actof absorption will be suspended, and the succeeding toothin the course of its eruption will naturally be deflected fromits course and erupt in an abnormal position. So, also, it has happened that a deciduous incisor, througha fall, has been driven up into the process. Such a mis-fortune can harcuy fail to cause an injury to the partiallyformed permanent tooth lying beneath it. Should no more * A model in the Museum of the Philadelphia Dental College representstwo supernumerary teeth occupying the space between the central of the teeth are turned or misplaced, and but for the presence of thesetwo vagrants, the dental arch would in all respects be a typical one. 20 ORTHODON
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