Principles and practice of operative dentistry . sui^puration. Pus may be produced, however, under certain circumstances withoutthe presence, aid, or intervention of micro-organisms, as, for instance,by the introduction beneath the skin of certain irritating chemical sub-stances. Councilman was the flrst to prove the fact that croton oil wheninjected beneath the skin of rabbits would produce suppuration withoutthe action of micro-organisms. The early experiments in this line gavevery conflicting results. Some investigators succeeded in producing anaseptic pus which would not cause suppuration
Principles and practice of operative dentistry . sui^puration. Pus may be produced, however, under certain circumstances withoutthe presence, aid, or intervention of micro-organisms, as, for instance,by the introduction beneath the skin of certain irritating chemical sub-stances. Councilman was the flrst to prove the fact that croton oil wheninjected beneath the skin of rabbits would produce suppuration withoutthe action of micro-organisms. The early experiments in this line gavevery conflicting results. Some investigators succeeded in producing anaseptic pus which would not cause suppuration when introduced intoanother organism, while others produced a septic product with the samechemic agent. These conflicting results were due in some cases to imper-fect aseptic methods ; in others to the fact that the same chemic substancewould produce suppuration in one species of animal and not in another,as xjointed out by Christmas, who was unable to produce suppuration inrabbits with turpentine or mercuiy, but succeeded with dogs. Fig. Suppuration of the dental pulp is in nowise different from suppuration asobserved in other connective tissues, except that which relates to its loca-tion and peculiar environment. It is found most commonly associatedwith exposure of this organ and under large fillings, the pulp of the toothhaving been previously inflamed. 30 466 OPEEATIVE DENTISTRY. Fig. 503. Suppuration of the pulp presents in two forms, mperjicial and paren-chymatous, and may be either acute or chronic in its manifestations Acute superficial suppuration of the pulp, or ulceration, is a destructiveloss or solution of continuity of the exposed surface of the organ • a molec-ular death of tissue, which will not permit of repair by primary unionand owes its existence to the fact that the retrograde changes or metamor-phoses are in excess of those of repair. Change the relationship betweenthese conditions and the ulceration will heal by granulation, just as is seenin ulce
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