. The science and practice of dental surgery. wn tartar just below thegum margin and the invasion of the pocketby bacteria and debris, possibly followedlater by extensive infection of the superficiallayer of the cementum of the roots, keep upthe irritation, and prevent the surroundingtissues from again embracing the necks of theteeth. Hopewell-Smith is of the opinion that pyor-rhoea alveolaris does not commence as a gin-givitis , but that it is essentially dependentupon an osseous lesion—an atrophy of thebone ; also that the disease is not m itsearliest stages a rarefying osteitis , and that s
. The science and practice of dental surgery. wn tartar just below thegum margin and the invasion of the pocketby bacteria and debris, possibly followedlater by extensive infection of the superficiallayer of the cementum of the roots, keep upthe irritation, and prevent the surroundingtissues from again embracing the necks of theteeth. Hopewell-Smith is of the opinion that pyor-rhoea alveolaris does not commence as a gin-givitis , but that it is essentially dependentupon an osseous lesion—an atrophy of thebone ; also that the disease is not m itsearliest stages a rarefying osteitis , and that senimal calculus Ls not in itself sufficient to induce the condition and may not be associatedwith it at all as a predisposing or excitingcause (20). Kenneth Goadby is of the opinion that milkmay contain organisms that are the source ofinfection in this disease. Morbid Anatomy.—The examination of skullsin ^^liom the disease was present shows that inthe earliest stages the bone between the teethis principally affected. At a later stage the. D Fig. 565. — Vertical section tlirougli cervical region ofmolar of man, which presented no symptom of pyor-rhoea alveolaris .A, Cementum; B, Normal periodontal membrane; C,Normal bone ; D, Areas of decalcification. (A. Hopewell-Smith: Dental Cosmos.) rest of each socket becomes markedly involved,the loss of bone being chiefly between the outerand inner alveolar plates (i. e. at the part closeto the necks of the teeth). leaving them standingas ridges, between which and the teeth are cup-shaped dex:)ressions. Then the whole of theremaining portion of the sockets gradually be-comes absorbed, the loss of bone spreadingtowards the apices of the teeth until finally thelatter fall out, having entirely lost their bony sup-port. Rough rings of tartar of a greenish-browncolour are seen around the necks of the teeth : 505 and the exposed portions of the cementumsometimes show dark brown stains. In somespecimens there seems to have been a thickenin
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentistry, bookyear19
