Influence of Powder-to-Gel Ratio on Physicochemical Properties of a Calcium Silicate Sealer

PURPOSE
Differences in liquid-to-powder ratio can affect the properties of calcium silicate-based materials. This study assessed the influence of powder-to-gel ratio on physicochemical properties of NeoMTA Plus.


METHODS
Setting time (minutes), flow (mm and mm²), pH (at different periods), radiopacity (mm Al) and solubility (% mass loss) were evaluated using the consistencies for root repair material (NMTAP-RP; 3 scoops of powder to 2 drops of gel) and root canal sealer (NMTAP-SE; 3 scoops of powder to 3 drops of gel), in comparison to Biodentine cement (BIO) and TotalFill BC sealer (TFBC). Statistical analysis was performed using one-way ANOVA and Tukey tests (α=0.05).


RESULTS
BIO had the shortest setting time, followed by NMTAP-RP and NMTAP-SE. TFBC showed the highest setting time and radiopacity. BIO, NMTAP-RP, and NMTAP-SE had similar radiopacity. All materials promoted an alkaline pH. NMTAP-RP/SE presented lower solubility than BIO and TFBC. Regarding the
flow, TFBC had the highest values, followed by NMTAP-SE, and NMTAP-RP. BIO had the lowest flow.

CONCLUSION
NMTAP in both powder-to-gel ratios showed high pH and low solubility. The increase in the powder ratio decreased the setting time and flow. These findings are important regarding the proper consistency and work time to clinical application.

FERRARI ESTEVES TORRES, FERNANDA & PERINOTO, PATRICIA & BOSSO MARTELO, ROBERTA & CHÁVEZ-ANDRADE, GISSELLE &
TANOMARU-FILHO, MÁRIO. (2020). INFLUENCE OF POWDER-TO-GEL RATIO ON PHYSICOCHEMICAL PROPERTIES OF A CALCIUM SILICATE SEALER. ODOVTOS - INTERNATIONAL JOURNAL OF DENTAL SCIENCES. 337-345. 10.15517/IJDS.2020.42998.