Dental cosmos . he first molar. The wisdom-toothleans against the second molar, its forward inclination beingdistinctly visible. Having gone so largely forward and out of thecurve, the first molar was unable to catch or retain its upper occlud-ing mate when it developed. The occlusion, therefore, is veryfaulty. The projecting shelf of lower molars which ought to existon the side toward the tongue is lacking. The intermeshing of thecusps, which ought to produce a perfect triturating or milling CHANGES DURING DEVELOPMENT OF THE HUMAN TEETH. 591 surface for the grinding of the food, is so nearly
Dental cosmos . he first molar. The wisdom-toothleans against the second molar, its forward inclination beingdistinctly visible. Having gone so largely forward and out of thecurve, the first molar was unable to catch or retain its upper occlud-ing mate when it developed. The occlusion, therefore, is veryfaulty. The projecting shelf of lower molars which ought to existon the side toward the tongue is lacking. The intermeshing of thecusps, which ought to produce a perfect triturating or milling CHANGES DURING DEVELOPMENT OF THE HUMAN TEETH. 591 surface for the grinding of the food, is so nearly useless that thepatient performs all the mastication upon the right-hand side ofthe mouth. The upper wisdom-tooth in its development impingesagainst the second molar; this in turn presses the first molar; andso on until the left lateral incisor projects considerably under thelip, while the right-hand side upper and lower of this same mouthis in an almost perfect state of articulation and arrangement. 18 In this other diagram (Fig. 17) the second bicuspid has been ex-tracted from the right-hand side. Almost exactly the same condi-tions exist as in Fig. 16. Dr. Howe speaks of the tendency of the six anterior teeth to aretrograde movement after the .extraction of the first the models already shown do not confirm any such tendency,the illustrations I here present exhibit a tendency quite opposite. 592 THE DENTAL COSMOS. Here are two diagrams: the first is that of a young lady of aboutthirteen years of age (Fig. 18), whose upper incisors were so promi-nent that she was unable to close the lips (Fig. 18 A). Thinkingthat I could draw those six teeth backward, I removed the two firstupper bicuspids, adapting a plate to the roof of the mouth, avoiding,as far as I could, any pressure upon the molars, and causing a barof gold attached by screws to pass around the front of the sixupper front teeth. This bar of gold had short spurs that passedbetween these teeth, so t
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