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Designing CAD/CAM Surgical Guides for Maxillary Reconstruction Using an In-house Approach
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CAD/CAM diamond tool wear.

Renato Cassio Roperto, Fabiane Carneiro Lopes, Thiago Soares Porto

    Quintessence International (Berlin, Germany : 1985)
    |September 29, 2018
    PubMed
    Summary

    Computer-aided design/computer-assisted manufacture (CAD/CAM) diamond burs showed significant wear after 35 milling procedures. However, both cylinder and step-burs exceeded their recommended lifespan, indicating durability beyond manufacturer specifications.

    Keywords:
    CAD/CAMdental technologydiamond bursprosthodonticsroughness

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    Area of Science:

    • Dental materials science
    • Biomaterials engineering
    • Manufacturing technology

    Background:

    • Computer-aided design/computer-assisted manufacture (CAD/CAM) technology is widely used in dentistry for fabricating dental restorations.
    • The longevity and wear characteristics of CAD/CAM burs are critical factors influencing the efficiency and cost-effectiveness of the milling process.
    • Understanding the morphologic changes in burs after repeated use is essential for optimizing their performance and predicting their lifespan.

    Purpose of the Study:

    • To evaluate the wear and morphologic changes of computer-aided design/computer-assisted manufacture (CAD/CAM) diamond burs after various milling cycles.
    • To compare the wear performance of cylinder burs and step-burs used in the Cerec Compact Milling unit.
    • To determine if the burs' performance exceeded the manufacturer's recommended milling limits.

    Main Methods:

    • Diamond burs (cylinder and step-bur) were subjected to 0, 15, 25, and 35 milling procedures using the Cerec Compact Milling unit and VitaBlock Mark II.
    • Surface roughness, three-dimensional profile analysis, and scanning electron microscopy (SEM) were employed to assess wear and surface damage.
    • Statistical analysis using two-way ANOVA and Tukey test (α = .05) was performed to compare the groups.

    Main Results:

    • Statistically significant differences in wear were observed in the 35-milling group (G3) compared to the control (G0) and 25-milling group (G2).
    • Cylinder burs exhibited higher surface roughness values than step-burs across all milling groups.
    • SEM analysis revealed similar diamond particle damage for both bur types, with notable surface damage, cracks, and particle loss in the G3 group.

    Conclusions:

    • Both cylinder and step-burs demonstrated resilience and maintained functionality beyond the manufacturer's stated milling capacity.
    • The findings suggest that CAD/CAM burs may have a longer service life than typically recommended, warranting further investigation into optimal replacement protocols.