The Impact of Intracanal Heating and Irrigation Solution Activation on Organic Tissue Removal from Internal Resorption Cavities: An in vitro Study

Objective: This study aimed to compare various activa- tion techniques for removing organic tissue from simulated internal re- sorption cavities, utilizing sodium hypochlorite (NaOCl) at both intracanal heated and room temperature. Material and Methods: A total of 120 mandibular premolar teeth were horizontally divided into two parts, and internal resorption cavities were created in each part. Bovine muscle tissue samples were inserted into resorption cavities. Roots were reassembled, and teeth divided into two groups (n=60) by irrigation temperature (room temperature, intracanal heated). Each of the two groups was further divided into 5 subgroups for irrigation ac- tivation purposes: standard needle irrigation (SNI), EndoActivator (EA), EDDY, passive ultrasonic irrigation, XP-endo Finisher (XPF). After irrigation protocols, organic tissue remnants in resorption cavities were scored and differences among tissue removal scores were ana- lyzed. Results: XPF demonstrated superior organic tissue removal compared to SNI in both room temperature and intracanal heated NaOCl groups. All activation groups showed no significant difference in the efficacy of organic tissue removal between NaOCl at room tem- perature and when heated intracanal.Conclusion: The XPF was found to be the most effective method for removing organic tissue from in- ternal resorption cavities. Intracanal heating NaOCl did not have any significant effect on removing organic tissue from internal resorption cavities.