Abstract
Root perforations were experimentally made at the furcation level in 15 maxillary and mandibular dog's premolars. A group of these perforations were dressed with an aqueous paste of calcium hydroxide and iodoform; another group was dressed with zinc oxide and eugenol; and in a third group (control) the perforations were kept open. After a 90-day postoperative interval, the dogs were killed and their teeth and neighboring structures processed for histopathological analysis. In those teeth dressed with calcium hydroxide, necrosis in front of the perforation and different levels of cementum hyperplasia were observed. The specimens dressed with zinc oxide and eugenol showed inflammatory reactions with abscess formation and resorption of the alveolar crest. In the opened perforations these same phenomena were also frequently seen. Root perforations were experimentally made at the furcation level in 15 maxillary and mandibular dog's premolars. A group of these perforations were dressed with an aqueous paste of calcium hydroxide and iodoform; another group was dressed with zinc oxide and eugenol; and in a third group (control) the perforations were kept open. After a 90-day postoperative interval, the dogs were killed and their teeth and neighboring structures processed for histopathological analysis. In those teeth dressed with calcium hydroxide, necrosis in front of the perforation and different levels of cementum hyperplasia were observed. The specimens dressed with zinc oxide and eugenol showed inflammatory reactions with abscess formation and resorption of the alveolar crest. In the opened perforations these same phenomena were also frequently seen.
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