. The principles and practice of surgery. ially upon the alveolar sockets, andupon the cavity of the pulp, formingexostoses. In some cases, also, thepulp itself undergoes an osseous trans-formation. The cementum is coveredby the peridental membrane, or den-tal periosteum, which also is continu-ous with the intra-alveolar periosteal membrane. The interior of each tooth is hollow, its cavity expanding into aspacious sinus within the crown, and terminating in minute orifices atthe apices of the fangs. These cavities contain the pulp, which iscomposed of blood-vessels and nervous filaments sustain
. The principles and practice of surgery. ially upon the alveolar sockets, andupon the cavity of the pulp, formingexostoses. In some cases, also, thepulp itself undergoes an osseous trans-formation. The cementum is coveredby the peridental membrane, or den-tal periosteum, which also is continu-ous with the intra-alveolar periosteal membrane. The interior of each tooth is hollow, its cavity expanding into aspacious sinus within the crown, and terminating in minute orifices atthe apices of the fangs. These cavities contain the pulp, which iscomposed of blood-vessels and nervous filaments sustained by a fibrousconnective tissue. Both the blood-vessels and the nerves composingthe pulp enter by the small foramina at the apices of the fangs. Thepulp is said to be the only portion of the tooth possessing sensibility;but, according to Mr. Tomes, the dental tubuli, which open upon andradiate from the pulp cavity, contain cylindrical prolongations of thepulp tissue, and may therefore convey sensation to the outer surface ofthe Vertical Section of a Bicus-pid Tooth. Magnified. Development and Diseases of the Temporary Teeth. Development.—The temporary teeth begin to present themselvesusually about the seventh month, and dentition is generally completedby the end of the second year; the teeth of the lower jaw precedingthose of the upper. The eruption of the temporary teeth is a purely physiological act, andas such ought to be accomplished without serious disturbance. Thefact is, however, that among all civilized races, the process is usuallyone of considerable suffering and hazard. The evolution of the teeth, 656 DISEASES OF TEMPORAET TEETH. independent of their mechanical pressure upon the gums, seems to exaltthe nervous sensibilities of the whole system in a degree sufficientlymarked; but when, from any cause, the advance of the crowns towardthe surface meets with unusual resistance, the most violent local andconstitutional disturbances sometimes ensue. It is an e
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