Rheological Characterization as an Alternative Method to Indentation for Determining the Setting Time of Restorative and Endodontic Cements

Materials

Timothy M. Nicholson¹  Bill Kahler²  Laurence J. Walsh²  William N. Ha² 

[1] School of Chemical Engineering, University of Queensland, St. Lucia, QLD 4072, Australia;School of Dentistry, University of Queensland, Herston, QLD 4006, Australia;

关键词: mineral trioxide aggregate;    elastic modulus;    dental materials;    glass ionomer cement;    epoxy resin cement;    glass ionomer;    Biodentine;    bioceramics;    endodontics;    physical properties;   

DOI  :  10.3390/ma10121451

来源: DOAJ

【 摘 要 】

This study explored an alternative approach using rheology to assess setting time. The following cements were tested: ProRoot® MTA (Dentsply, Tulsa, OK, USA), Biodentine® (Septodont, Saint Maur des Fosses, France), Fuji VII®, FujiVII® EP, and Fuji IX® (from GC Corporation, Tokyo, Japan), RealSeal SE™ Sealer (SybronEndo, Amersfoort, The Netherlands), AH 26® and AH Plus (both from Dentsply DeTrey, Konstanz, Germany). Freshly mixed cements were placed into a strain-controlled rheometer (1 rad·s−1 with an applied strain of 0.01%). From measurements of elastic modulus over time, the time taken to reach 90% of the plateau elastic modulus (designated as the setting time) was determined for each cement. In increasing order, the setting times were as follows: Fuji VII EP 3.3 min, Fuji VII 3.6 min, Fuji IX 3.7 min, ProRoot MTA 5.1 min, Biodentine 15.9 min, RealSeal 22.2 min, AH Plus 5933 min, and AH 26 5067 min. However, ProRoot MTA did not yield reliable results. The time to reach the 90% plateau elastic modulus correlates well with the setting time of glass ionomer cements and Biodentine. Using this approach gives much longer setting times for endodontic sealers than previously recognized.

【 授权许可】

Unknown