. La scienza e la pratica della chirurgia dentaria. r La piastra è stata rimossa per showthe entità della calcificazione dei denti permanenti.(Museo odontoiatriche, Royal College of Surgeonsof Inghilterra.) tracciata in questo periodo le radici del deciduousincisors. Le cripte del primo permanentmolars sono ampiamente aperti e il loro contenuto 27 denti sono diventati in parte estruso attraverso,la soprastante gengiva da sola rimasta intatta. Thecrowns degli incisivi sono complete, excepttoward il margine cervicale, dove il enamelmay presente il noioso, lustreless, aspetto indi-cative di calcificazione incompleta (vedere figg.

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. The science and practice of dental surgery. r plate has been removed to showthe extent of calcification of the permanent teeth.(Odontological Museum, Royal College of Surgeonsof England.) traced at this period in the roots of the deciduousincisors. The crypts of the first permanentmolars are widely open and their contained 27 teeth have become partly extruded through, the overlying gum alone remaining intact. Thecrowns of the incisors are complete, excepttowards the cervical margin, where the enamelmay present the dull, lustreless, appearance indi-cative of incomplete calcification (see Figs. 27, 42). The canines and premolars are lessadvanced in tlieir calcification, while the secondpermanent molars show only a cap of calcifiedtissue. The crypts of the second upper molarsare assuming a more vertical position, and thebone covering them is incomplete. The rootsof the first permanent molars are formedthroughout half their length, those of theincisors are merely indicated, while the crownsof the remaining teeth are incomplete. There. Fig. 43.—The maxilla and mandible at the seventhyear. The outer alveolar plate has been removedto show the relation of the deciduous to thepermanent teeth and of the latter to each other. is a fullness in the maxillary incisor region, indicating the presence of these teeth. The position of the crypts of the permanentteetli, and their relation to one another, as wellas to the deciduous dentition, can be more easilylearned by studying a skull of this period thanfrom any long and detailed description (see Fig.43). A few salient points may, however, bementioned. The crjpts of the incisors areoblique, owing probably to growth of bone inthe inter-pre-maxillary suture, and those of theupper jaw extend to the floor of the nose. Inboth jaws they are partly covered in front bythe roots of their predecessors. The lateralincisor crypts are placed somewhat internal tothe dental arch, while those of tlie canine aresituated outside the arch and deeper i

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• bookcentury1900
• bookdecade1910
• booksubjectdentistry
• bookyear19