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Phase composition of ProRoot mineral trioxide aggregate by X-ray powder diffraction
Irma Araceli Belío-Reyes1, Lauro Bucio, Esther Cruz-Chavez
1Facultad de Odontología, Universidad Autónoma de Sinaloa, Culiacan, Sinaloa, Mexico.
Journal of Endodontics
|June 2, 2009
Summary
This study determined the crystalline phases of ProRoot Mineral Trioxide Aggregate (MTA). ProRoot MTA primarily consists of tricalcium silicate and bismuth oxide, with smaller amounts of dicalcium silicate and other compounds.
Area of Science:
- Materials Science
- Biomaterials Engineering
- Dental Materials Science
Background:
- Understanding the composition of endodontic materials like Mineral Trioxide Aggregate (MTA) is crucial for their performance.
- ProRoot MTA is a widely used endodontic material, but its precise crystalline phase composition requires detailed analysis.
Purpose of the Study:
- To accurately determine the crystalline phase composition of ProRoot MTA.
- To correlate the material's composition with its physical and chemical properties.
Main Methods:
- X-ray diffraction (XRD) was employed for phase identification by comparing ProRoot MTA peaks with the International Centre for Diffraction Data (ICDD) database.
- Energy-dispersive spectrometry (EDS) and particle-induced X-ray emission (PIXE) were used for elemental analysis.
- Rietveld refinement was applied to quantitative phase analysis of the XRD data.
Main Results:
- ProRoot MTA's composition was quantified as: bismuth oxide (19.8%), tricalcium silicate (51.9%), dicalcium silicate (23.2%), calcium dialuminate (3.8%), and calcium sulfate dehydrated (1.3%).
- Trace elements including iron (Fe), nickel (Ni), copper (Cu), and strontium (Sr) were detected.
- The primary components indicate a basis in Portland cement mixed with bismuth oxide for radiopacity.
Conclusions:
- Rietveld refinement successfully quantified the crystalline phases in ProRoot MTA.
- The material is fundamentally a mixture of Portland cement components and bismuth oxide.
- This detailed compositional analysis provides a basis for understanding ProRoot MTA's behavior in endodontic applications.
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