Higher hydration performance and bioactive response of the new endodontic bioactive cement MTA HP repair compared with ProRoot MTA white and NeoMTA plus

ABSTRACT
INTRODUCTION:

The aim of this study was to characterize the hydration performance and the bioactive response of the new bioactive endodontic cement MTA HP repair (HP), comparing its physicochemical parameters with those of ProRoot MTA White (Pro) and NeoMTA Plus (Neo). Un‐hydrated precursor materials were characterized by X‐ray fluorescence, laser diffraction, N2 physisorption and field emission gun scanning electron microscopy (FEG‐SEM). Setting time was assessed according to ASTM specification C 266. Hydrated materials were analyzed by X‐ray diffraction, Fourier transform infrared spectroscopy (FT‐IR) and (FEG‐SEM). Bioactivity evaluation in vitro was carried out, by soaking processed cement disk in simulated body fluid (SBF) during 168 h. The cements surface was studied by FT‐IR, FEG‐SEM, and energy dispersive X‐ray. Release to the SBF media of ionic degradation products was monitored using inductively coupled plasma atomic emission spectroscopy. HP showed shorter initial setting time compared to Pro and Neo and produce a quick and effective bioactive response in vitro in terms of phosphate phase surface coating formation. This higher bioactive response for HP is correlated with increasing calcium aluminate content, increasing surface area of un‐hydrated powder precursor and the increasing release capacity of Si ionic products of the final hydrated product. The higher bioactive response of MTA HP repair highlights this material, as very interesting to further investigate its performance to improve the outcome of vital pulp therapy procedures.

METHODS:

ProRoot MTA White [DENTSPLY Tulsa Dental Specialties, DENTSPLY International, Inc. 5100 E. Skelly Drive, Suite 300, Tulsa, OK, – lot n. 0000163567], NeoMTA Plus (Avalon Biomed Inc., Bradenton, FL, – lot n. 2017021601] and MTA HP Repair [Angelus, Londrina, Brazil – lot n. 38585] were used in this study.

RESULTS:

Three commercial BECs used in endodontic therapy (ProRoot MTA White, NeoMTA Plus and MTA HP Repair), both in the form of powder precursor and final set processed product, are characterized in terms of chemical composition and microstructure. After the measure of their physio-chemical properties, it can be concluded that MTA HP Repair showed the lowest initial setting time, and produced a faster and more effective bioactive response in terms of HA surface coating formation.

CONCLUSION:

After the measure of their physio-chemical properties, it can be concluded that MTA HP Repair showed the lowest initial setting time, and produced a faster and more effective bioactive response in terms of HA surface coating formation.

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