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Related Experiment Videos

An SEM study of overhang removal methods.

G C Spinks, R E Carson, E B Hancock

    Journal of Periodontology
    |October 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

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    The sonic scaler created significantly rougher root surfaces compared to curets and diamond tips when recontouring dental restorations. Ease of use varied, with diamond tips being fastest and curets slowest.

    Area of Science:

    • Restorative Dentistry
    • Dental Materials Science
    • Biomaterials

    Background:

    • Overhanging dental restorations can lead to plaque accumulation and periodontal issues.
    • Effective removal of restoration overhangs is crucial for maintaining oral hygiene.
    • Various instruments are used for recontouring, each with potential effects on root surface integrity.

    Purpose of the Study:

    • To compare the surface roughness of root dentin produced by sonic scalers, curets, and motor-driven diamond tips.
    • To evaluate the clinical efficiency and time required for overhang removal by these instruments.
    • To assess the formation of gaps between the restoration and tooth surface.

    Main Methods:

    • Ninety extracted human teeth with amalgam or composite resin overhangs were prepared.

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  • Each of the three instruments (sonic scaler, curet, diamond tip) was used to remove 30 overhangs.
  • Root surfaces were examined using scanning electron microscopy (SEM) at x140 magnification and assessed by dentists in a single-blind manner for roughness.

    • Main Results:

    • The sonic scaler produced a significantly higher number of rough root surfaces for both amalgam and composite resin restorations compared to curets and diamond tips.
    • No significant differences in roughness were observed between curets and the diamond-tip system.
    • No instrument created significant gaps between the restoration and tooth; however, clinical ease was greatest for the diamond tip and least for the curet, with removal times of 3, 7, and 15 minutes, respectively.

    Conclusions:

    • Sonic scalers may increase root surface roughness more than curets or diamond tips during overhang removal.
    • Reciprocating motor-driven diamond tips offer the most efficient and easiest method for overhang removal.
    • Instrument selection should consider the balance between effectiveness in overhang removal and potential for root surface alteration.