Principles and practice of operative dentistry . rateunless the pyogenic organisms are al-ready in the system and are depositedat the point of injury from the blood-current. Under such circumstances theinjured tissues, by reason of their low-ered vital powers of resistance, wouldfurnish a favorable soil for the growthand propagation of the pyogenic organ-isms, and the formation of pus would bethe result. Septic pericementitis may be eitheracute or chronic^ and is usually the sequelof inflammation and gangrene of thepulp, the exceptions being such casesas those just mentioned. Septic peri-cemen
Principles and practice of operative dentistry . rateunless the pyogenic organisms are al-ready in the system and are depositedat the point of injury from the blood-current. Under such circumstances theinjured tissues, by reason of their low-ered vital powers of resistance, wouldfurnish a favorable soil for the growthand propagation of the pyogenic organ-isms, and the formation of pus would bethe result. Septic pericementitis may be eitheracute or chronic^ and is usually the sequelof inflammation and gangrene of thepulp, the exceptions being such casesas those just mentioned. Septic peri-cementitis always begins as a circum-scribed inflammation, located at the apexof the root of the tooth, occasionally in-volving one or more teeth upon eitherside of it; the tissues first involved are those of the apical space, and forthis reason it is often spoken of and described as apical pericementitis. Acute apical pericementitis sometimes accompanies pulpitis; when thisdual condition is manifest in double- or multiple-rooted teeth, it is possi-. J K A, dental pulp and its artery ; B, dentin ; C,tunica propria ; B, enamel; E, pericementum ;F, cementum ; G, canal in lower jaw ; H, dentalartery; J, branch of dental artery supplyingpericementum; K, branch of dental arterysupplying tunica propria. (After Black.) 524 OPERATIVE DENTISTRY. ble for one of the roots to contain a devitalized pulp while the other por-tions are vital; but when this dual condition occurs in teeth having a singleroot; another explanation is needed to account for the phenomenon. Itseems probable, therefore, that inasmuch as the vessels of both the pulpand the pericementum arise from a common branch located at the apicalspace (Fig. 571), and the connective tissue which enters the foramen withthe vessels and nerve-trunk is continuous with the pericementum at theapical space, the inflammation has spread by continuity of structure. Acute apical pericementitis, however, is not always of septic origin,for it may be
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