Dental cosmos . Upon a recognition of this principle here involved, that the con-dition of the lower arch decides the condition of the upper teeth,is, I believe, to be based our success in retaining in their properpositions teeth which we have regulated in the forward part of themouth. I have, therefore, no fear that this case of regulating will Fig. after a lapse of ten years disappoint me by returning to its originalposition. It may be interesting to notice the diastema that existsin the mouth of the chimpanzee (Fig. 14). It is occupied by thelower cuspid, which in these apes being quit
Dental cosmos . Upon a recognition of this principle here involved, that the con-dition of the lower arch decides the condition of the upper teeth,is, I believe, to be based our success in retaining in their properpositions teeth which we have regulated in the forward part of themouth. I have, therefore, no fear that this case of regulating will Fig. after a lapse of ten years disappoint me by returning to its originalposition. It may be interesting to notice the diastema that existsin the mouth of the chimpanzee (Fig. 14). It is occupied by thelower cuspid, which in these apes being quite long, strikes anteriorlyto the upper cuspid. When the diastema disappears, the brute dis-appears and man is found. The nearest approach to this diastema CHANGES DURING DEVELOPMENT OF THE HUMAN TEETH. 589 that I have seen in man I present you in model (Fig. 15). It isthat of a Hottentot. It will be noticed that his inferior cuspidsstrike so nearly in the position of his Darwinian ancestors that thelower incisors form a complete arch strong enough to retain theupper incisors at a distance from the cuspids. The extraction of apermanent tooth, then, during the period of development results ina shorter jaw and bite than normal. Nor is this all. Yery often a further evil result is irregularity inthe position of the teeth. The vacancy caused by an extr
Size: 2424px × 1031px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthor, bookcentury1800, bookdecade1880, booksubjectdentistry
