Microbial Load After Apical Enlargement in Asymptomatic Teeth With Periapical Lesion

The goal of this observational study is to define the role of apical shaping and irrigation activation on root canal cleanliness. The main questions it aims to answer are: * does the effectiveness of irrigation activation depends on apical shaping? * can a similar success be achieved by increasing apical shaping without irrigation activation Participants will \[describe the main tasks participants will be asked to do, treatments they'll be given and use bullets if it is more than 2 items\].