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Updated: Oct 17, 2025

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

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CAD/CAM Milled Glass Fiber Posts: Adaptation and Mechanical Behavior in Flared Root Canals.

Mer Gama, G S Balbinot, G C Ferreira

    Operative Dentistry
    |October 8, 2021
    PubMed
    Summary

    CAD/CAM milled glass fiber posts show better adaptation in flared root canals than prefabricated or relined posts. While bond strength is comparable to relined posts, fracture resistance is lower than prefabricated options.

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    Area of Science:

    • Restorative Dentistry
    • Biomaterials Science
    • Endodontics

    Background:

    • Restoring endodontically treated teeth with flared root canals presents challenges for post-and-core systems.
    • CAD/CAM technology offers potential for customized restorations.
    • Glass fiber posts are favored for their mechanical properties and biocompatibility.

    Purpose of the Study:

    • To evaluate the cementation quality and mechanical behavior of CAD/CAM milled glass fiber post-and-core systems in flared root canals.
    • To compare CAD/CAM milled posts with prefabricated and relined glass fiber posts.
    • To assess void formation, bond strength, and load-to-fracture resistance.

    Main Methods:

    • Sixty-six endodontically treated human canine teeth with flared canals were divided into three groups: prefabricated posts (GPF), relined posts (GREL), and CAD/CAM milled posts (GMILLED).
    • Cementation was performed using self-adhesive resin cement.
    • X-ray microcomputed tomography analyzed voids and gaps. Push-out bond strength and load-to-fracture tests were conducted.

    Main Results:

    • CAD/CAM milled posts (GMILLED) exhibited significantly lower void and gap volumes compared to prefabricated (GPF) and relined (GREL) posts.
    • Push-out bond strength was significantly higher for GREL and GMILLED compared to GPF.
    • Load-to-fracture values were highest for GREL, with no significant difference from GPF, but GMILLED showed lower values than GPF.

    Conclusions:

    • CAD/CAM milled glass fiber post-and-core systems demonstrate superior adaptation in flared root canals.
    • These milled systems offer comparable bond strength to relined posts but possess lower fracture resistance than prefabricated posts.
    • The findings suggest CAD/CAM milled posts are a viable option, particularly when adaptation is critical, though fracture resistance needs consideration.