. The science and practice of dental surgery. one hand, that these forms of mal-occlusion may occur independently of mouth-breathing, and on the other hand, that mouth-breathing is not al\\ ays follow ed by any obviousdeformity of the maxilla or mandible or dentalarches (175). The usual tyiae of maxUla inthese cases shows a laterally contracted archwith high-vaulted palate and anterior teethprominent and mclined forward; it does not 78 usually become evident tiU about six yearsof age (100). In some cases, the central incisorsare rotated, so that the lingual surfaces approxi-mate, the laterals
. The science and practice of dental surgery. one hand, that these forms of mal-occlusion may occur independently of mouth-breathing, and on the other hand, that mouth-breathing is not al\\ ays follow ed by any obviousdeformity of the maxilla or mandible or dentalarches (175). The usual tyiae of maxUla inthese cases shows a laterally contracted archwith high-vaulted palate and anterior teethprominent and mclined forward; it does not 78 usually become evident tiU about six yearsof age (100). In some cases, the central incisorsare rotated, so that the lingual surfaces approxi-mate, the laterals are rotated and displacedlingually, and the general form of the arch isV-shaped (see Fig. 122). In others the arch ismore U-shaped, and the incisors, though pro-minent, are not rotated. In the V-shaped archthe want of space in the incisor and canine regionis very apparent, the latter tooth often beingincompletely erupted, whereas in the U-shapedarch there is often spacing, and the canine sliaresto some extent in the prominence and obliquity. Fio. 122.—Adenoid arches. The maxilla is very characteristic : note theV-shaped arch and the rotation and displacement of the incisors.(Norman G. Bennett.) of the incisors. Brady (35) draws a sharpdistinction between these two forms, but it isdoubtful whether this can be upheld. Turner (155, p. 337) appears to ascribe wantof proper spacing of the deciduous teeth atabout five years of age, and failure in verticaldevelopment of the anterior portions of themaxilla, leading later to open bite, bothto adenoids; but in the opinion of the writerthe former phenomenon, at , occurs quitefrequently with normal breathing, and is refer-able to want of development from other is discussed more fully later. It is a moot point whether the summit of the palatal vault is really higher than normal ornot (130) (175), or whether it only appearsto be so by reason of the buccal teeth andalveolus being more vertical than is normallythe case, and
Size: 1598px × 1563px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
