Document Detail

Setting expansion of gray and white mineral trioxide aggregate and Portland cement.
MedLine Citation:
PMID:  18155499     Owner:  NLM     Status:  MEDLINE    
One possible reason for the sealing ability of mineral trioxide aggregate (MTA) is its slight expansion upon setting. Both gray mineral trioxide aggregate (GMTA) and white mineral trioxide aggregate (WMTA) are composed of approximately 75% Portland cement (PC). WMTA differs from GMTA in its lower content of tetracalcium aluminoferrite. This difference in composition may affect setting expansion. The purpose of this study was to compare the hydroscopic linear setting expansions of GMTA, WMTA, and PC with a new device. Materials were mixed with water, placed into a cylindrical mold, and covered with sterile water or Hank's balanced salt solution (HBSS). Expansion changes were measured by using a linear variable displacement transformer dilatometer. One-way analysis of variance and post hoc tests (alpha = 0.05) showed the mean expansion at 24 hours was 1.02% for GMTA, 0.29% for PC, and 0.08% for WMTA in water immersion and 0.68% for GMTA and 0.11% for WMTA in HBSS immersion. GMTA expanded significantly more than WMTA in either water or HBSS immersion.
Buffy Storm; Frederick C Eichmiller; Patricia A Tordik; Gary G Goodell
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of endodontics     Volume:  34     ISSN:  0099-2399     ISO Abbreviation:  J Endod     Publication Date:  2008 Jan 
Date Detail:
Created Date:  2007-12-24     Completed Date:  2008-03-10     Revised Date:  2008-04-29    
Medline Journal Info:
Nlm Unique ID:  7511484     Medline TA:  J Endod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  80-2     Citation Subset:  D    
Naval Postgraduate Dental School, Bethesda, Maryland, USA.
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MeSH Terms
Aluminum Compounds / chemistry*
Calcium Compounds / chemistry*
Dental Cements / chemistry*
Drug Combinations
Materials Testing / instrumentation,  methods
Oxides / chemistry*
Root Canal Filling Materials / chemistry*
Silicates / chemistry*
Time Factors
Reg. No./Substance:
0/Aluminum Compounds; 0/Calcium Compounds; 0/Dental Cements; 0/Drug Combinations; 0/Oxides; 0/Root Canal Filling Materials; 0/Silicates; 0/mineral trioxide aggregate

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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