The effect of rubber dam usage on the survival rate of teeth receiving initial root canal treatment
: a nationwide population-based study.
Nonsurgical endodontic retreatment is needed when microbial infection persists or recurs after initial root canal treatment
because of insufficient cleaning and shaping, missed canals, inadequate root filling, or coronal leakage (1).
Retreatment versus initial root canal treatment
: factors affecting posttreatment pain, Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontics, 92: 321-324.
While initial root canal treatment
has the potential for a successful outcome, with high survival rates of treated teeth , failure is also a possibility (12-19%) [2, 3].