Experimental Study of Pulp Changes Produced in the Decompression Chamber

Abstract

Expts. on dogs were conducted to ascertain the reaction of the dental pulp to decompression and anoxia. Different filling materials were used to establish possible irritation by these materials and their role in decompression. Thirteen dogs were used and 12 teeth of each were sectioned for microscopic examination. There was no significant difference in the response of the pulps of dogs to the commonly used filling materials; in no case was there more than a mild local tissue reaction. Croton oil applied to cavities produced an acute inflammation. Decompression to simulate an altitude of 38,0!);) ft. produced a hyperemia and occasional hemorrhages; these changes apparently had largely subsided 30 mins. after re-compression. The findings were the same in the control teeth and in those subjected to common dental operative procedures; the reactions were increased in intensity in the specimens treated with croton oil. Anoxia, leading to asphyxiation, produced severe hyperemia and extensive capillary hemorrhages; the effects of the anoxia were the same whether it took place at ground level or at altitude.