الفهرس 
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Abstract
This study designed to evaluate the effect of sodium hypochlorite,
MTAD, and Tea Tree Oil irrigation solutions on bacteria in infected root
canals with periapical lesions, and their effect on healing of periapical
lesions. The study conducted as follows:
Part I: total of thirty patients-males and females-were included in this
study, their ages ranged between 20-55 years. Each of them was diagnosed
for being healthy, not suffering from any systemic illness, having a
radiographically evident periapical radiolucency related to either mandibular
or maxillary single rooted teeth. Standardized intraoral periapical
radiographs were taken at the baseline using bite blocks with a long-cone
paralleling technique.
Before biomechanical preparation, root canals were irrigated using
sterile saline prior to sampling. They were then sampled using three paper
points per each sample S1. The paper points were placed into transport
medium of thioglicolate broth and carried in pre-sterilized screw tubes for
microbial culturing.