Principles and practice of operative dentistry . deepersubstance of the pulp, while at b theodontoblastic layer has been consider -. ably undermined. This undermining ofthe odontoblastic layer Dr. Black foundto be the general rule in progressivesuppuration or ulceration of the pulp. Fig. 503 represents a longitudinalsection taken from a case of pro-gressive suppuration or ulceration ofthe pulp of an incisor, and shows thatthe destructive process follows thecourse of the veins, progressively de-stroying the tissue as it advances fromthe point of exposure to the apex. Acute parenchymatous suppur
Principles and practice of operative dentistry . deepersubstance of the pulp, while at b theodontoblastic layer has been consider -. ably undermined. This undermining ofthe odontoblastic layer Dr. Black foundto be the general rule in progressivesuppuration or ulceration of the pulp. Fig. 503 represents a longitudinalsection taken from a case of pro-gressive suppuration or ulceration ofthe pulp of an incisor, and shows thatthe destructive process follows thecourse of the veins, progressively de-stroying the tissue as it advances fromthe point of exposure to the apex. Acute parenchymatous suppurationof the pulp, or abscess, is an accumula-tion of pus in the parenchyma of theorgan surrounded by a wall of owes its existence to the action ofan excessive and continuous irritationwhich has caused a copious exudation,the filling of the connective-tissuespaces, pressure upon the capillary blood-vessels causing stasis, followed by coagulation of the fibrinous ele-ments. The leucocytes lose their vitality, while pressure upon the con-. Progressive suppuration of the pulp. (AfterBlack.) X 100. a, healthy tissue; &, odonto-blastic layer; c, inflamed tissue showing di-lated veins; d, line of demarcation of suppu-rative process; e, pus. 410 OPERATIVE DENTISTRY. nective-tissue cells involved in the affected area produces a like result inthem, and by the action of the pyogenic bacteria which have gained accessthrough external channels, or through the avenue of the circulation, theexudates and the tissues are converted into pus. These abscesses are usu-ally situated near the point of exposure, and are rarely found says it is not uncommon to find several minute pus-pockets at alittle distance from the point of exposure. The abscess may, however,occupy the central portion of the pulp. Burchard removed such a pulp,the abscess involving nearly its entire structure, but leaving the peripheralportion unbroken, as shown in Fig. 504. Fig. 504.
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