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Related Experiment Videos

Self-threading pin penetration into dentin.

T A Garman, P P Binon, D Averette

    The Journal of Prosthetic Dentistry
    |March 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Self-threading pins, specifically the first half of 0.031 and 0.024-inch sizes, do not fully seat in dental preparations. This leads to excess pin length, potentially weakening amalgam restorations.

    Area of Science:

    • Dental materials science
    • Biomaterials engineering
    • Restorative dentistry

    Background:

    • Self-threading pins are used to reinforce amalgam restorations.
    • Proper seating of pins is crucial for restoration integrity and strength.

    Purpose of the Study:

    • To evaluate the seating depth of self-shearing 2-in-1 self-threading pins.
    • To determine the impact of placement method on pin seating accuracy.

    Main Methods:

    • Laboratory study using self-shearing 2-in-1 self-threading pins (0.031 and 0.024 inch).
    • Pins were placed using a hand wrench and an Auto Klutch handpiece.
    • Penetration depth and excess pin length were measured.

    Main Results:

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  • The first half of the pins failed to reach full channel depth in all tested conditions.
  • An average penetration discrepancy of 0.75 mm was observed.
  • This resulted in significant excess pin length within the tooth preparation.

    • Conclusions:

    • Inadequate seating of self-threading pins compromises their intended function.
    • Excessive pin extension can negatively affect the mechanical properties of amalgam restorations.
    • Further research into pin design and placement techniques is warranted.