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Related Experiment Videos

[Basic studies on cutting of composite resin cores].

M Yamauchi, E Cho, M Iwahori

    Nihon Hotetsu Shika Gakkai Zasshi
    |December 1, 1989
    PubMed
    Summary

    Composite resin cores exhibit comparable filler content and Knoop hardness to posterior resins, with hardness correlating to filler load. Cutting characteristics varied, and polished surfaces showed greater roughness than silver alloys.

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    Area of Science:

    • Materials Science
    • Biomaterials Engineering
    • Dental Materials

    Background:

    • Composite resin cores are widely used in dental restorations.
    • Understanding their physical and mechanical properties is crucial for clinical success.
    • Comparative analysis with existing materials provides valuable insights.

    Purpose of the Study:

    • To evaluate filler content, Knoop hardness, cutting characteristics, and surface texture of commercial composite resin cores.
    • To compare these properties with posterior composite resins and silver alloys.
    • To establish correlations between material properties and performance.

    Main Methods:

    • Analysis of eight commercial composite resin cores.
    • Inclusion of two posterior composite resins and two silver alloys as controls.

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  • Measurement of filler content and Knoop hardness.
  • Assessment of cutting characteristics using diamond points.
  • Evaluation of surface texture via SEM and surface roughness measurements.

    • Main Results:

    • No significant differences in filler content or Knoop hardness between composite resin cores and posterior composite resins.
    • A positive correlation was observed between Knoop hardness and filler content in composite resins.
    • Significant variations in cutting characteristics were noted among the tested materials.
    • Composite resin cores were categorized into two groups based on cutting performance deterioration.
    • Polished composite resin surfaces exhibited higher roughness compared to silver alloys.

    Conclusions:

    • Composite resin cores demonstrate comparable filler content and hardness to posterior composite resins.
    • Filler content is a key determinant of Knoop hardness in these materials.
    • Cutting performance is material-dependent, influencing clinical handling.
    • Surface roughness after polishing requires consideration for optimal restoration outcomes.