DETERMINATION OF THE P-MONOCHLOROPHENOL RESIDUE IN THE CALCIUM HYDROXIDE PLUS P-MONOCHLOROPHENOL COMBINATION USED AS AN INTRACANAL DRESSINGIN PULPLESS TEETH OF DOGS WITH INDUCED CHRONIC PERIAPICAL LESION

To determine the presence of p-monochlorophenol in the calcium hydroxi de (Calen) + p-monochlorophenol combination after its use as intracana l dressing, periapical lesions were induced in 60 root canals of upper and lower premolars of four dogs, After biomechanical preparation, th e root canals received the intracanal medication, which was removed fr om the apical third after 2, 4, 7, and 14 days for chemical analysis b y spectrophotometry, The results showed a p-monochlorophenol loss of a pproximately 50.0% in the dressing after 48 h, with no further signifi cant loss after longer periods of times, p-Monochlorophenol was still present in the medication after 14 days.