(PR007) Effect of Heating on The Physicochemical Properties of Novel Calcium Silicate-Based Endodontic Sealers

Objective: The present study evaluated the effect of heating on the physicochemical properties of three endodontic sealers: Bio-C ion +® (BC), NeoSEALER EZFlo® (NE), and EndoSequence BC Sealer HiFlow® (HF).

Methods: Sealers’ samples were divided into heated (H) and unheated (NH) groups, with the (H) group heated at 100 °C for 1 minute. The flow and solubility were evaluated according to ISO and ANSI/ADA standards. The calcium release was measured by an inductively coupled plasma optical emission spectrometer. Chemical composition was analyzed with energy-dispersive X-ray spectroscopy. The pH was measured after 3, 24, 48, and 168 hours of immersion in ultrapure water, and the dimensional changes were assessed after 30 days of immersion in distilled water and PBS. Data were analyzed with Kruskal-Wallis, ANOVA, and Tukey’s tests (p=0.05).

Results: Heating significantly increased the flow of NE (p < 0.05). All sealers’ solubility did not follow the ADA standards and was not influenced by the heating, as was the calcium release (p < 0.05). Significant chemical changes were observed between the (H) and (NH) groups (p < 0.05). All sealers presented a pH higher than seven at all evaluated times, and the heating did not affect the pH (p >0.05). Heating did not affect dimensional changes. BC (H) and (NH), and NE (H) presented alterations that did not meet the ANSI/ADA standard.

Conclusion: Heating did not affect the solubility, calcium release, pH, and dimensional changes of all evaluated sealers; however, it increased NE flow and altered the chemical composition of all sealers.