Manual of dental surgery and pathology . ly contracted or not, become dilated, whilst the blood whichthey contain becomes retarded in its flow, with complete stagna-tion at certain points: without the limits of the area of irrita-tion the vessels are dilated, and the circulation more than nor-mally active. This probably constitutes the stage of congestionof tlie alveolo-dental membrane, which becomes enlarged inconsequence, and this enlargement can only be effected by anelevation of the tooth in its socket: hence also the apparentlooseness of the tooth. Pressure on the tooth at tliis periodfor
Manual of dental surgery and pathology . ly contracted or not, become dilated, whilst the blood whichthey contain becomes retarded in its flow, with complete stagna-tion at certain points: without the limits of the area of irrita-tion the vessels are dilated, and the circulation more than nor-mally active. This probably constitutes the stage of congestionof tlie alveolo-dental membrane, which becomes enlarged inconsequence, and this enlargement can only be effected by anelevation of the tooth in its socket: hence also the apparentlooseness of the tooth. Pressure on the tooth at tliis periodforces the blood from the dilated vessels of the membrane, andhence no doubt the comfort experienced by this act. In thenext stage, at the stagnant parts, the vessels become crowdedand finally blocked up with the red corpuscles which adhere totheir walls, whilst the white corpuscles, in like manner adher-ent, are seen in increased quantity: these latter put forth pro-cesses which penetrate the walls of the vessels, and, enlarging Fig. Diagram to Illustrate the passage of the white blood-corpuscles through the walls of a blood-vessel, and their subsequent migration between the fibres of the surrounding connective red and white blood-cells are not represented in their due proportions, as this would ob-scure the chief point we desire to illustrate. on the outer sides of the vessels, and diminishing on the inner,thus transport their contents or substance through them (): when free, the cells travel towards the irritated spots byaid of their amoeboid contractility, the changes in the surround-ing connective tissue, by the softening and fusion of its fibres, 2i0 MANUAL OF DENTAL SURGERY AND PATHOLOGY. rendering their passage more easy. Besides the passage of thewhite blood-cells, serum, more or less considerable in quantity,has passed out of the vessels into the surrounding tissue, andprobably by its presence and pressure gives rise to the pain ex-perienced at th
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectdentist, bookyear1882
