1. Articles from Sungjo Park

    1-2 of 2
    1. Identification of multi-dimensional thread geometry using depth-resolved swept-source optical coherence tomography for assessment of dental implant fabrication

      Identification of multi-dimensional thread geometry using depth-resolved swept-source optical coherence tomography for assessment of dental implant fabrication

      The geometrical characteristics of dental implants, such as thread depth and width, facing angle, pitch, and surface roughness, are important to assess their stability and osseointegration after implant surgery. Herein, we demonstrate the potential use of depth-resolved swept-source optical coherence tomography (SS-OCT) to assess the structural quality of widely used dental implants. The implemented SS-OCT system was centered at a wavelength of 1300 nm with a 100 nm full-width at half-maximum. Four dental implants with different structural formations fabricated using either titanium or ceramic were visualized. Qualitative assessments were performed using boundary flattening with an amplitude-profiling algorithm to emphasize and ...

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    2. Non-destructive identification of weld-boundary and porosity formation during laser transmission welding by using optical coherence tomography

      Non-destructive identification of weld-boundary and porosity formation during laser transmission welding by using optical coherence tomography

      Laser transmission welding offers significant benefits over conventional welding techniques enabling single-stage rapid plastic joining. The quality of laser transmission welded products are commonly assessed by measuring the weld penetration depth, hardened weld boundary, and inspecting the formation of porosity. However, existing methods of verification are inevitably accompanied by destruction of the specimen. Thus, non-destructive quality assessment methods for laser transmission welding have gained attention recently. Here, we demonstrated an extended industrial application of 860 nm wavelength based spectral domain optical coherence tomography for the non-destructive inspection of the aforementioned quality parameters of laser transmission welded industrial plastic materials, i ...

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    1-2 of 2
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  2. Topics in the News

    1. (2 articles) Kyungpook National University
    2. (2 articles) Ruchire Eranga Wijesinghe
    3. (2 articles) Mansik Jeon
    4. (2 articles) Jeehyun Kim
    5. (1 articles) University of Pennsylvania
    6. (1 articles) National Institutes of Health
    7. (1 articles) Peking University
    8. (1 articles) FDA
    9. (1 articles) Washington University in St. Louis
    10. (1 articles) Lehigh University
    11. (1 articles) Duke University
    12. (1 articles) Massachusetts Institute of Technology
    13. (1 articles) Chao Zhou
    14. (1 articles) James G. Fujimoto
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