AI Article Synopsis
- The study investigates the particle size distribution (PSD) of Portland cement (PC) and bismuth oxide (BO) in mineral trioxide aggregate (MTA) cements using laser diffraction and scanning electron microscopy.
- The results show that BO has a near Gaussian particle size distribution with a peak at 10.48 μm, while PC varies in size from 4.88 to 19.31 μm depending on milling.
- MTA-P features a complex PSD with both fine and large PC particles, while MTA-A contains only small BO and large PC particles, highlighting the need for manufacturers to disclose particle sizes to better understand the material properties.
Article Abstract
Mineral trioxide aggregate (MTA) cements contain two types of particles, namely Portland cement (PC) (nominally 80% w/w) and bismuth oxide (BO) (20%). This study aims to determine the particle size distribution (PSD) of PC and BO found in MTA. The PSDs of ProRoot MTA (MTA-P) and MTA Angelus (MTA-A) powder were determined using laser diffraction, and compared to samples of PC (at three different particle sizes) and BO. The non-linear least squares method was used to deconvolute the PSDs into the constituents. MTA-P and MTA-A powders were also assessed with scanning electron microscopy. BO showed a near Gaussian distribution for particle size, with a mode distribution peak at 10.48 μm. PC samples milled to differing degrees of fineness had mode distribution peaks from 19.31 down to 4.88 μm. MTA-P had a complex PSD composed of both fine and large PC particles, with BO at an intermediate size, whereas MTA-A had only small BO particles and large PC particles. The PSD of MTA cement products is bimodal or more complex, which has implications for understanding how particle size influences the overall properties of the material. Smaller particles may be reactive PC or unreactive radiopaque agent. Manufacturers should disclose particle size information for PC and radiopaque agents to prevent simplistic conclusions being drawn from statements of average particle size for MTA materials.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4894085 | PMC |
| http://dx.doi.org/10.3109/23337931.2015.1129611 | DOI Listing |
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