Abstract

Background: Inadequate apical seal is a major cause of surgical endodontic failures. Therefore, the use of a suitable substance as root-end filling material that sets immediately and prevents penetration of potential contaminants into the periapical tissue is vital. The aim of present study was to compare the marginal adaptation of calcium-enriched mixture cement (CEM-cement) and CEM-cement plus calcium chloride (CaCl2) (as an accelerator) using scanning electron microscope (SEM). Materials and Methods: 24 extracted human single-rooted teeth were decoronated from the cemento-enamel junction to prepare 16 mm roots. After cleaning, shaping, and obturation, 3 mm above the apex was cut perpendicular to the long axis, and an apical cavity was prepared by an ultrasonic device. Specimens were randomly divided into two groups and were retro filled by experimental materials (CEM-cement and CEM-cement + CalCl2). Next, the roots were sectioned, and SEM examination was done to determine the gap size between cavity walls and end-root materials. The collected data were analyzed by Mann-Whitney test and using SPSS software version 18 at a significant level of 0.05. Results: The mean gap size was higher in CEM-cement + CaCl2 group in comparison with CEM-cement group. However, no significant differences were observed by statistical test (P = 0.79). Conclusion: CaCl2 as an additive substance for acceleration of CEM-cement setting cannot remarkably influence the marginal adaptation of CEM to the root canal walls.