Physical properties of different root canal sealers

Abstract

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-Vallée, 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.

Keywords: root canal sealer; radiopacity; push out; calcium silicate