Development and characterization of experimental ZnO cement containing niobophosphate bioactive glass as filling temporary material

Abstract

Aims The aim of this study was to develop and characterize a temporary restorative material based on a zinc oxide matrix containing niobophosphate bioactive glass (NbG) for the caries-affected dentin treatment. Material and methods NbG was added to a ZnO 2 matrix in different concentrations (wt%). EDS-SEM, ATR-FTIR and XRD analyses were performed to characterize the cement. Calcium release was evaluated in TRIS solution after 1, 7 and 14 days by colorimetric method (A 650 ). Compressive strengths and setting times were performed to analyze mechanical properties. Results EDS spectra confirmed the presence of Ca, P and Nb in the groups containing NbG. EDS mapping exhibit the ZnO 2 homogeneous distribution, and NbG immersed in this matrix. Peaks suggesting interaction between matrix and NbG were not detected in Ftir spectra. Calcium releasing showed to be time-dependent for experimental groups containing 10, 20, 30 and 40%. The NbG incorporation progressively increased the compressive strength values in the experimental groups. NbG incorporation seemed to influence the ZnO 2 matrix early setting reaction. No statistical difference was observed in the final setting time. Conclusion The addition of NbG particles into zinc oxide matrix could work as a mechanical reinforcement. It is suggested that the calcium released by the cement containing at least 10% NbG could induce apatite formation.

Evaluation of compressive strength, microhardness and solubility of zinc-oxide eugenol cement reinforced with E-glass fibers

“…These results are in accordance with previous studies conducted by Ferreira et al, who concluded that the addition of at least 10% niobophosphate bioactive glass to ZOE enhances its compressive strength compared to unmodified ZOE cement [ 37 ].…”

“…The sample size calculation was based on a similar study [ 37 ]. With an alpha level of 0.05 and a power of 85%, a sample size was determined using G*Power software version 3.1.9.7 (Heinrich Heine University Duesseldorf, Duesseldorf, Germany).…”