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Effects of EDTA on the Hydration Mechanism of Mineral Trioxide Aggregate

¹ Graduate Institute of Clinical Dentistry,
² Institute of Biomedical Engineering, College of Medicine, National Taiwan University and National Taiwan University Hospital, No. 1 Chang-Te Street, Taipei 10016, Taiwan, ROC; and
³ Department of Cariology, Restorative Sciences and Endodontics, University of Michigan, Ann Arbor, MI, USA

View larger version (168K): [in this window] [in a new window]   Figure 1. Scanning electron micrographs of hydrated mineral trioxide aggregate (MTA) in distilled water (A), in normal saline (B), and in ethylenediaminetetraacetic acid (EDTA) (C,D). The crystalline structure of hydrated MTA consisted of cubic and needle-like crystals in both the distilled water and normal saline groups. By contrast, the microstructure of MTA hydrated in EDTA consisted of an amorphous phase with a granular appearance and a domed structure. (A–C) Scale bar = 20 µm. (D) Scale bar = 3.33 µm.

View larger version (11K): [in this window] [in a new window]   Figure 2. X-ray powder diffraction (XRD) patterns for unhydrated mineral trioxide aggregate (MTA powder) and the hydrated MTA stored in distilled water (DW), normal saline (NS), and ethylenediaminetetraacetic acid (EDTA). Peaks at 2 = 27.3° () and 2 = 32°–34° (•) are identified as the reactants in all MTA specimens. There was no significant difference in XRD pattern between the specimens stored in EDTA and the MTA powder itself. In the case of the distilled water and normal saline groups, an obvious decrease was noted in the intensities of the peaks of reactants; an additional peak was also observed at 2 = 18° ().

View larger version (178K): [in this window] [in a new window]   Figure 3. Scanning electron micrographs of MRPC-1 cells cultured on mineral trioxide aggregate (MTA) for 4 hrs. MRPC-1 cells show a flattened morphology (A) with filopodia (B) on the MTA specimens in distilled water. However, MRPC-1 cells remained rounded (C) and bulbing (D) on the MTA specimens in ethylenediaminetetraacetic acid. (A,C) Scale bar = 20 µm. (B,D) Scale bar = 3.33 µm.

View larger version (25K): [in this window] [in a new window]   Figure 4. Illustration of the hydration mechanism of mineral trioxide aggregate (MTA).

Journal of Dental Research, Vol. 86, No. 6, 534-538 (2007)
DOI: 10.1177/154405910708600609


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