File:Dental cosmos (1893) (14798992943).jpg

Identifier: dentalcosmos3518whit (find matches)
Title: Dental cosmos
Year: 1893 (1890s)
Authors: White, J. D McQuillen, J. H. (John Hugh), 1826-1879 Ziegler, George Jacob, b. 1821 White, James William, 1826-1891 Kirk, Edward C. (Edward Cameron), 1856-1933 Anthony, Lovick Pierce, 1877-
Subjects: Dentistry
Publisher: Philadelphia : S. S. White Dental Manufacturing Co
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: The College of Physicians of Philadelphia and the National Endowment for the Humanities

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Text Appearing Before Image:
g of the end of the dental ridge in Fig. 2 cannot be regarded ascommencement of reserve teeth. The point of fusion of the teeth with the jaw-bones is <no longer ON THE DEVELOPMENT OF THE TEETH IN THE CHAMELEON. III3 visible in the older front teeth, but can still be recognized in theyounger molars. Fig. 3 gives a section through the antepenultimatetooth of the lower jaw of an adult animal. The odontoblasts of thedentine are continuous with the osteoblasts of the jaw-bone. Wefind a similar transition between dentine and bone. Along theboundary there is osteodentine,—i.e., a tissue in which occur dentinaltubules and bone-cells. Some bone-cells possess abnormally longprocesses, which had for some time the function of forming the den-tine and Tomess fibers, but finally were entirely inclosed by basis-substance, and thus changed into bone-cells. It is scarcely possibleto show the close relationship between dentine and bone more strik-ingly than in the acrodont reptiles. Fig. 2. O.111.
Text Appearing After Image:
Fig. 2.—Chameleon vulgaris, 22 cm. long. Frontal section through the upper jaw. Z,second tooth ; DK, dentine germ ; ZL. dental ridge; E. epithelium of the jaw ; Km, bone-mar-row ; O.m., maxilla ; L, lip ; LF, labial furrow ; Gl.L, labial gland. 50 diam. Whilst the dental ridge, in the region of the functional anteriorteeth, remains in continuous connection with the epithelium of thejaws, it loses this connection in the region of the developing posteriorteeth, as is also the case in man. Fig. 4 gives a section in which thedental ridge has a broad connection with the enamel-organ of thedeveloping tooth, and also with the epithelium of the jaw. In thenext section that connection has already disappeared, and both thedental ridge and the developing tooth lie imbedded in the mesoderm,without any connection with the epithelium of the jaw. The ingrowth 1114 THE DENTAL COSMOS. of the dental ridge, marked X, may perhaps be explained as the lastremains of a former series of teeth. On the poste

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