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Marginal Leakage of Class V Composite Restorations Assessed Using Microcomputed Tomography and Scanning Electron

C Rengo, C Goracci, G Ametrano

    Operative Dentistry
    |January 21, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Microcomputed tomography (micro-CT) offers a valid, non-destructive method for assessing marginal leakage in composite restorations. This technique provides quantitative measurements comparable to scanning electron microscopy (SEM) for evaluating restoration sealing ability.

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    Area of Science:

    • Dental Materials Science
    • Restorative Dentistry
    • Diagnostic Imaging Techniques

    Background:

    • Marginal leakage in dental restorations can lead to secondary caries and restoration failure.
    • Accurate assessment of marginal leakage is crucial for evaluating the efficacy of restorative materials and techniques.
    • Traditional methods like scanning electron microscopy (SEM) can be destructive and time-consuming.

    Purpose of the Study:

    • To compare marginal leakage measurements in Class V composite restorations using microcomputed tomography (micro-CT) and scanning electron microscopy (SEM).
    • To determine the quantitative accuracy and diagnostic capability of micro-CT for evaluating marginal seal in dental restorations.

    Main Methods:

    • Class V cavities were prepared in human molars and restored with specific composite materials and bonding agents.
    • Marginal leakage was assessed using silver-nitrate penetration depth.
    • Micro-CT analysis provided high-resolution cross-sectional images for leakage evaluation.
    • SEM was used for direct visualization and scoring of leakage at different magnifications.

    Main Results:

    • No statistically significant difference in leakage scores was found between micro-CT and 20× SEM.
    • Higher magnification SEM (80×) revealed infiltration in sections initially scored as zero by 20× SEM.
    • Evaluating all micro-CT cross-sections resulted in higher leakage scores for some teeth compared to evaluating only three sections.

    Conclusions:

    • Microcomputed tomography (micro-CT) is a valid and non-destructive in vitro method for quantitative evaluation of marginal leakage in adhesive restorations.
    • Micro-CT offers a comprehensive approach to assessing marginal seal, potentially surpassing the limitations of traditional SEM methods.