Abstract
This study will evaluate the action of nitric oxide (NO) in relation to the local inflammatory response in periapical lesions, and its consequent systemic action in rats with one or multiple endodontic infections by quantifying its producing enzyme, nitric oxide synthase (NOS). 30 male Wistar rats will be divided into three groups of 10 animals each: G0 - healthy rats; G1 - rats with endo…