. The science and practice of dental surgery. adiographsthe condition of the teeth from birth up to thesixteenth year, thus giving a fairly completehistory of calcification of the teeth after investigation was carried out by means ofmedian sections through the head, and showsthat multi-cuspidate teeth calcify by independentdeposits on the apices of the dental papilla;otiier phenomena also have been elucidated orconfirmed. It may be broadly stated that calcificationof the deciduous and permanent teeth hasextended to the apices of their roots withintwo years from the time of their com
. The science and practice of dental surgery. adiographsthe condition of the teeth from birth up to thesixteenth year, thus giving a fairly completehistory of calcification of the teeth after investigation was carried out by means ofmedian sections through the head, and showsthat multi-cuspidate teeth calcify by independentdeposits on the apices of the dental papilla;otiier phenomena also have been elucidated orconfirmed. It may be broadly stated that calcificationof the deciduous and permanent teeth hasextended to the apices of their roots withintwo years from the time of their completeeruption ; but that a fiuther period of a yearor t\\o elapses before the entire thickness of theroot has calcified. At the end of the first year the roots of thedeciduous incisors are delineated to half their extent, those of the first deciduous molars arewell advanced in their formation, while those ofthe second molars and canines are quite dis-cernible (see Figs. 27, 3i»). The anteriorwall of the alveoli of the incisors is deficient,. Fig. 39.—The maxilla and uiandibk- at tlie ind of thufirst year. The outer alveolar plate has beenremoved to show the deciduous and some of thepermanent teeth in their crypts. (OdontoluqiralMuseum, Roijal College of Suiyeons of England.) allowing the cro\s of these teeth to appearthrough the gum (see Fig. 37). The alveoli ofthe molars and canines are imperfect at theirorifices, but the gum over their crowns is stillintact, although prominent over the first molars.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
