Boston University Libraries OpenBU
    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    •   OpenBU
    • Goldman School of Dental Medicine
    • GSDM: Historical Theses and Dissertations (BU access only)
    • View Item
    •   OpenBU
    • Goldman School of Dental Medicine
    • GSDM: Historical Theses and Dissertations (BU access only)
    • View Item

    Effect of additives on the physical properties of mineral trioxide aggregate

    Thumbnail
    Date Issued
    2008
    Author(s)
    Samadzadeh, Ashkan
    Share to FacebookShare to TwitterShare by Email
    Export Citation
    Download to BibTex
    Download to EndNote/RefMan (RIS)
    Metadata
    Show full item record
    Permanent Link
    https://hdl.handle.net/2144/41637
    Abstract
    Mineral Trioxide Aggregate has gained popularity among clinicians, in respect to other endodontic materials, due to the superiority of its biological and physical properties. However, the main disadvantage of MTA is its prolonged setting time. MTA may gain wider acceptance in endodontic applications if its setting time could be shortened to a single appointment time frame. The purpose of this study was to investigate the effects of additives on setting time, strength, microleakage, and pH of an experimental version of Mineral Trioxide Aggregate (EMTA). The tested additives were 3%, 6%, 9%, 12%, 15%, 18% calcium chloride; 10%, 20%, 30% silicon; 10%, 20%, 30% Bioactive Inorganic Element (BIE); and were compared to control (EMTA). Setting time was determined by measurement of penetration depths at fixed intervals using a dial indicator microgauge. The biaxial flexural strength was determined with an Instron universal testing machine after 1, 7 and 21 days of setting. A fluid filtration method was used for quantitative evaluation of apical microleakage. The quality of seal of each specimen was measured after 1, 7, 14, 21, 28, 42 and 56 days. The pH of storage solutions of each specimen in 20 ml of deionized water was measured after 6 hours, 1, 2, 7 and 21 days. The data were statistically analyzed with both one-way ANOVA and Tukey’s HSD test methods. The results showed that the setting time and rate of EMTA was significantly shortened (p[less than]0.001) by the addition of calcium chloride at concentrations of 6% or greater. Calcium chloride also increased the rate of strength development by improving the 1 day biaxial flexural strength (p[less than]0.001); however, it exerted negative effects on the final strength values. Addition of silicon increased the final strength (p[less than]0.05), while BIE decreased the strength. The samples containing calcium chloride exhibited a better seal (p[less than]0.001) and were slightly less alkaline than the control. Under the conditions of this study it appears that addition of calcium chloride may shorten the setting time to a single treatment visit time frame, without adversely affecting the microleakage and physical properties of MTA.
    Description
    PLEASE NOTE: This work is protected by copyright. Downloading is restricted to the BU community: please click Download and log in with a valid BU account to access. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.
     
    Thesis (MSD)--Boston University, Goldman School of Dental Medicine, 2008 (Dept. of Restorative Science and Biomaterials).
     
    Includes bibliographical references: leaves 146-153.
     
    Rights
    This work is protected by copyright. Downloading is restricted to the BU community. If you are the author of this work and would like to make it publicly available, please contact open-help@bu.edu.
    Collections
    • GSDM: Historical Theses and Dissertations (BU access only) [657]


    Boston University
    Contact Us | Send Feedback | Help
     

     

    Browse

    All of OpenBUCommunities & CollectionsIssue DateAuthorsTitlesSubjectsThis CollectionIssue DateAuthorsTitlesSubjects

    Deposit Materials

    LoginNon-BU Registration

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Boston University
    Contact Us | Send Feedback | Help