The Dental cosmos . uently com-mences very early in life ; contracted jaws, on the other hand, neverbegin to form until the seventh or eighth, and in most cases the tenthyear, except in cases of monstrosities, or from traumatic causes. Whenthese conditions exist, they are wholly unlike the usual contractedarches and can be diagnosticated at once, and therefore they should notenter into this discussion. Contracted arches are of two kinds, V-(Fig. 1) and saddle-shaped (Fig. 2), all the other varieties beingmodifications and blendings of these two. It is apparent that thecause which produces the
The Dental cosmos . uently com-mences very early in life ; contracted jaws, on the other hand, neverbegin to form until the seventh or eighth, and in most cases the tenthyear, except in cases of monstrosities, or from traumatic causes. Whenthese conditions exist, they are wholly unlike the usual contractedarches and can be diagnosticated at once, and therefore they should notenter into this discussion. Contracted arches are of two kinds, V-(Fig. 1) and saddle-shaped (Fig. 2), all the other varieties beingmodifications and blendings of these two. It is apparent that thecause which produces the one does not produce the other. My ob-servation has been that there are two-thirds more V- and saddle-shaped 922 THE DENTAL COSMOS. arches among the low vaults than among the high vaults, taking .58of an inch as the average ; but where one of these deformities existswith a high vault it is always more marked, for the reason that in thehigh vault the alveolar process is long and thin, with very little resist- Fig. ance, and the teeth are more easily carried in one direction or theother. In the V-shaped arch, commencing at the first permanent molar,there is a gradual narrowing of the teeth-occupancy and alveolar Fig. 2.
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Keywords: ., bookauthor, bookcentury1800, bookdecade1890, booksubjectdentistry
