Retreatment Efficacy of Hand vs Rotary Instrumentation in Oval-shaped Root Canals: An In Vitro Study

Complete removal of obturating material exposes the necrotic tissue remnant that may be accountable for the posttreatment disease.Removal of GP and root canal sealers would assist in maximizing the ability to disinfect the root canal system.Gutta-percha in conjunction with different sealers is the most commonly used obturation material.Different techniques have been used to remove GP from the root canal which includes use of K-type or H-files along with solvents such as, chloroform, IntroductIonOne of the primary goals of endodontic treatment is the elimination of microorganisms from the root canal.However, root canal treatment may fail even when the treatment is carried out with the highest standard and the most meticulous treatment procedure.In most cases, the endodontic failure results from persistent or secondary intraradicular infection.1,2 Initial root canal treatment failure rate is about 14-16%.3 Previously treated teeth with persistent periapical infection might be retained with nonsurgical Retreatment or endodontic surgery, assuming the tooth is restorable, periodontally sound, and the patient desires to retain the tooth.An epidemiological study was done by Kvist and Reit to know the success of nonsurgical Retreatment and surgical Retreatment.There was no statistically significant difference between the success rate of surgical and nonsurgical Retreatment; the most commonly selected treatment for failed endodontic cases is nonsurgical Retreatment as surgical Retreatment resulted in more postoperative discomfort, trauma to the normal oral tissues, and postsurgical complications. 3 A nonsurgical Retreatment showed a higher success rate of 83.0% compared with 71.8% for endodontic surgery.An endodontic surgery offers more favorable initial success, but nonsurgical Retreatment offers a more favorable long-term outcome.4 Nonsurgical endodontic Retreatment aims to eliminate previous obturating material which is followed by complete mechanical as well as chemical disinfection and in the end a three-dimensional obturation of the root canal complex.