Introduction

Root canal therapy is the most effective and the most commonly used method, it uses a special apparatus and method for root canal cleaning, shaping (root canal preparation), effective drug for root canal disinfection sterilization, root canal disinfection, and finally close filling root canal and coronal restoration (root canal filling), so as to control the infection and repair defects, promote the healing of periapical lesions or the purpose of prevention and treatment of periapical lesions occur.