Chemical and pharmacological shaping of necrotic primary teeth.

AIM The object of this study was the evaluation of the success rate of endodontic treatment of primary teeth with necrotic pulps performed through a partial pulpectomy and a chemical shaping. MATERIALS AND METHODS The study was conducted on 50 necrotic primary molars, with an oral fistula and a clinical and radiographical positive diagnosis. On each tooth the endodontic treatment was performed through mechanical strumentation for only 2-3 mm beyond the orifices of the canals and copious alternate irrigation with 10vol H(2)O(2) and 3% NaOCl (chemical shaping). After the pharmacological shaping the canals were filled with a slurry mix of powdered macrolide antibiotic (josamicina) and glycerine (or anaesthetic solution). At the second visit the same procedure was either repeated, if an oral fistula was still present, or the canals were sealed with a small amount of josamicina and glycerine paste and zinc oxide eugenol to a working length. RESULTS The overall success rate, considering the first two teeth that were extracted as inappropriate case selection, was 45 out of the original 48 or 93%. While considering all the teeth treated the success rate was 45 out of 50, or 90%.