Evaluation of Two Rotary Systems in Removing Root Canal Filling Material Using Different Ultrasonic Irrigation Techniques (SEM Study)
Aim: The first step in the retreatment of failed endodontically treated teeth is the removal of obturation materials from the root canals system. This study aimed to assess the effectiveness of two ultrasonic irrigation techniques using two different file systems in non-surgical endodontics retreatment.
Materials and methods: Forty eight extracted maxillary first molars palatal roots were prepared using size X3 (protaper next, dentsply) and obturated using a single cone technique using a bioceramic sealer. After two weeks of storage at 37°C and 100% humidity, the teeth were randomly divided into two groups (n=24) based on the type of instrument used for retreatment: Reciproc (R25) and Wave One Gold (WOG), then each group was subdivided according to the irrigation technique used: Conventional Needle Irrigation (CNI), Passive Ultrasonic Irrigation (PUI) and Continuous Ultrasonic Irrigation (CUI). Subsequently, the roots were then split and the sections parts were examined under SEM and scored according to somma classification. The results were analyzed statistically by the Kruskal-Wallis test and Mann-Whitney U test.
Results: Both groups show an amount of residual obturation materials covering the dentinal tubeless. CUI significantly reduced the amount of residual obturation materials (P<0.05).
Conclusion: None of the removal approaches successfully removed all of the root canal filling materials. CUI was found to improve the removal of root filling material in both groups.