Physical properties of different root canal sealers

Introduction/Objective. Aim was to evaluate the push-out bond strength to root canal dentine and radiopacity of three different sealers: Adseal (Meta Biomed Co., Cheongju-si, South Korea), CeraSeal (Meta Biomed Co.) and control AH Plus (Dentsply Sirona, Charlotte, NC, USA). Methods. In nine dentin discs, 1 mm thickness, three holes, 1.2 mm diameter, were drilled in with a fissure carbide bur. Discs were immersed in 0.5% NaOCl and 10% citric acid respectively, for 60 seconds rinsed and dried. Every hole was filled with different sealer. Specimens were wrapped in gauze previously immersed in Hank?s balanced salt solution at 37?C/seven days. The push-out test was performed using universal testing machine at a cross-head speed of 1 mm/min. The radiopacity was tested (ISO 6876/2012 standard). Three sealer specimens, 5 mm in diameter and 2 mm thick were prepared and radiographed using radiovisiography system (CCD sensor, Trophy Radiologie, Marne-la-Vallee, France) with graded aluminum step-wedge. Gray-scale value was assessed using Adobe Photoshop CS7 (Adobe Inc. San Jose, CA, USA). Results. Mean values of push-out bond strength were 5.21 ? 0.87 MPa (Adseal), 0.06 ? 0.02 MPa (CeraSeal), and 3.13 ? 0.38 MPa (AH Plus). A statistically significant difference in push-out bond strength was observed among all three sealer groups (p < 0.05). Adseal exhibited the strongest bond strength to root canal dentine. All sealers achieved radiopacity over 3 mm, with statistically significant difference among the groups (p < 0.05). Conclusion. The epoxy-based sealer Adseal showed higher bond strength compared to AH Plus and calcium silicate-based sealer CeraSeal, which, expectedly, showed the weakest dislocation resistance. All three sealers fulfilled the ISO standard to be distinguished on dental radiogram.