Orthodontia, or, Malposition of the human teeth : its prevention and remedy / by S.H. Guilford.

  • Guilford, Simeon Hayden, 1841-1919.
Date:
1893
Catalogue details

Licence: Public Domain Mark

Credit: Orthodontia, or, Malposition of the human teeth : its prevention and remedy / by S.H. Guilford. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

    28/248 (page 18)
    expansion of the process is lacking in one jaw, while in the other the normal enlargement continues. As a consequence there is disparity as to size between the two jaws, and the appearance of the individual is perhaps permanently marred. DELAYED ERUPTION OF PERMANENT TEETH. It sometimes happens, from causes not easily definable, that the eruption of one or more of the permanent teeth is retarded to such a degree that the rest of the set take posi- tions in the arch and occupy all the space. When the tardy member is ready to erupt there is no place for it, and it is compelled to take a position outside or inside of the line. This is apt to occur more frequently with the cuspids than any of the other teeth, although it is occasionally met with in the case of laterals and bicuspids. SUPERNUMERARY TEETH. Supernumerary teeth are very frequently found occupying a position in the arch before the eruption of the permanent set, so that when the latter appear there is insufficient room for some of their number, and these are forced to assume an abnormal position. Such supernumerary teeth as appear Fig. 1. in the line of the arch and in the anterior part of the mouth are usually small and of the conical or peg-tooth va- riety, and are most frequently found between the central incisors. Fig. 1 re]tresents a case of Torsion caused by Supernumerary. this kind ill the UlOlltll of 8 Japanese boy, nine years of age, in which as a result of the presence of the extra tooth, the right central is turned one- fourth of a circle, while its mate is also somewhat rotated.