. The science and practice of dental surgery. ly in direct connection ^\ith the enamelof the cro\, but they are distinctly rare. Onsection the nodule jjrojecting from the normaldentine of the tooth seems to consist of a core ofdentme, which, if large, may contain a prolonga-tion from tlie pulp. Most frequently a group ofirregular spaces is present in the neighbourhoodof the nodule. The cap of enamel is well marked,although its structure is usually granular. When an enamel nodule is examined insection, the structure would suggest that it hasbeen produced by the tooth-germ that hasformed the too
. The science and practice of dental surgery. ly in direct connection ^\ith the enamelof the cro\, but they are distinctly rare. Onsection the nodule jjrojecting from the normaldentine of the tooth seems to consist of a core ofdentme, which, if large, may contain a prolonga-tion from tlie pulp. Most frequently a group ofirregular spaces is present in the neighbourhoodof the nodule. The cap of enamel is well marked,although its structure is usually granular. When an enamel nodule is examined insection, the structure would suggest that it hasbeen produced by the tooth-germ that hasformed the tooth, and not by a process ofgemination. It would appear to be due citherto a portion of the sheath of Hertwig under-going an enamel-producing function, or to anabnormal development of a part of the coronalportion of the enamel-organ. odontomes that have the form of a dilatedtooth containing a hollow or depression. Considerable variation exists among thespecimens included in this sub-group, but theyall possess certain common Fig. 987.—A dilated composite udunlunie occupying theposition of the mandibular premolars. The illustra-tion is from a model with the specimen in situ. Itis the globular fonn of dilated coinposito odontome. They have some resemblance to a normal toothin that they present a coronal portion coveredby enamel, and a radicular portion. They havean appearance of dilatation, which may involvethe crown, and hi almost all cases involves theroot. Also, roughly corresponding with theapparent dilatation, the walls enclose a hollow ordepression. The group known as KadicularOdontomes of former classifications, comprises 760 those where the radicular portion of the odon-tome alone presents the dilated appearance. One type of this sub-group shows a coronalportion, nuich larger than the normal crown ofa tooth, with the central depression leading
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
