Particle size changes in unsealed mineral trioxide aggregate powder

Ha, William N., Kahler, Bill and Walsh, Laurence James (2014) Particle size changes in unsealed mineral trioxide aggregate powder. Journal of Endodontics, 40 3: 423-426. doi:10.1016/j.joen.2013.10.018

Author Ha, William N.
Kahler, Bill
Walsh, Laurence James
Title Particle size changes in unsealed mineral trioxide aggregate powder
Journal name Journal of Endodontics   Check publisher's open access policy
ISSN 0099-2399
Publication date 2014-01-01
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.joen.2013.10.018
Open Access Status DOI
Volume 40
Issue 3
Start page 423
End page 426
Total pages 4
Place of publication Philadelphia, PA United States
Publisher Elsevier
Language eng
Subject 3500 Dentistry
Formatted abstract
Mineral trioxide aggregate (MTA) is commonly supplied in 1-g packages of powder that are used by some clinicians across several treatments against the manufacturer's instructions. ProRoot MTA cannot be resealed after opening, whereas MTA Angelus has a resealable lid. This study assessed changes in particle size distribution once the packaging had been opened.
Fresh ProRoot MTA and MTA Angelus powder were analyzed by using laser diffraction and scanning electron microscopy and compared with powder from packages that had been opened once and kept in storage for 2 years. The ProRoot packet was folded over, whereas the MTA Angelus jar had the lid twisted back to its original position.
After 2 years, ProRoot MTA powder showed a 6-fold increase in particle size (lower 10% from 1.13 to 4.37 μm, median particle size from 1.99 to 12.87 μm, and upper 10% from 4.30 to 34.67 μm), with an accompanying 50-fold change in particle surface area. MTA Angelus showed only a 2-fold increase in particle size (4.15 to 8.32 μm, 12.72 to 23.79 μm, and 42.66 to 47.91 μm, respectively) and a 2-fold change in particle size surface area.
MTA reacts with atmospheric moisture, causing an increase in particle size that may adversely affect the properties and shelf life of the material. Smaller particles have a greater predisposition to absorb moisture. Single-use systems are advised.
Keyword Laser diffraction
Mineral trioxide aggregate
Particle size
Pre hydration
Single use applications
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2015 Collection
School of Dentistry Publications
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