Dental cosmos . nt of activeforce,—the impacting agent, the pestle, the hammer. In an analysis of the upper jaw, we find that it presents certain ele-ments of architectural strength and beauty that invite our attention,as it is so admirably adapted to the purposes for which it is constructed. Professor Harrison Allen describes the upper jaw as bHng funda-mentally composed of three piers or columns for the reception andsupport of the impact of mastication, these piers being supported byarches and bounded by curves. (See Fig. i ) The first (a) is the central, the nasal column. It begins with the
Dental cosmos . nt of activeforce,—the impacting agent, the pestle, the hammer. In an analysis of the upper jaw, we find that it presents certain ele-ments of architectural strength and beauty that invite our attention,as it is so admirably adapted to the purposes for which it is constructed. Professor Harrison Allen describes the upper jaw as bHng funda-mentally composed of three piers or columns for the reception andsupport of the impact of mastication, these piers being supported byarches and bounded by curves. (See Fig. i ) The first (a) is the central, the nasal column. It begins with thesuture at the connection of the nasal bones and maxillaries with thefrontals, the brain-case, which is a strong point. Below, the nasalbones unite with the processes of the superior-maxilla and the azygesprocesses of the vomer, the latter bone assisting in the distribution ofstatic force. The column then leads down through the body of themaxilla and the canine eminence to the anterior alveolar base. It Fig. Architectural Scheme of the Upper , nasal column ; b, malar column ; c, pterygoid column ; it, supra-orbital arch ; e, infra-orbitalarch ; f% upper nasal half-arch ; g, lower nasal half-arch ; h, maxillary arch. marks a strong pillar of resistance leading from the anterior cornersof the dental arch to the forehead. The two nasal columns appeararched and divided about the nasal openings, and have their headsencasing the roots and receiving the cuspids, which are the strongestteeth in the arch. These teeth are planted in the heads of the centralstatic columns, which mark the lines of greatest resistance. The mostserious mutilation that the face can suffer in regard to its dental ele-ments is the loss of the cuspids, for this column then shrinks andatrophies, and the lost fullness of the face can never be restored byartificial means. This column is, therefore, a most important factor inthe mechanics of the face and the philosophy of expression, and illus-trates the b
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Keywords: ., bookauthor, bookcentury1800, bookdecade1890, booksubjectdentistry
