Analysis of Internal Defects in All-ceramic Crowns Using Micro-focus X-ray Computed Tomography

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  • NAKAMURA Takashi
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • WAKABAYASHI Kazumichi
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • KAWAMURA Yoshiko
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • KINUTA Soichiro
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • MUTOBE Yoshihiko
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry
  • YATANI Hirofumi
    Department of Fixed Prosthodontics, Osaka University Graduate School of Dentistry

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Abstract

The purpose of this study was to examine all-ceramic crowns for internal defects using micro-focus X-ray computed tomography (microCT). Mono-ceramic CAD/CAM crowns, ceramic-core CAD/CAM crowns, and heat-pressed ceramic crowns were used as specimens. The microCT images of the specimens were obtained and analyzed using a 3D volume rendering software.<br>Mono-ceramic CAD/CAM crowns contained almost no pores, while ceramic-core CAD/CAM crowns contained pores only in the porcelain veneer area. Heat-pressed ceramic crowns had lots of pores in the cusps and the area around them.<br>Results of this study indicated that internal pores in all-ceramic crowns could be observed non-destructively using microCT, and that CAD/CAM all-ceramic crowns contained fewer pores than crowns fabricated using manual techniques.

Journal

  • Dental Materials Journal

    Dental Materials Journal 26 (4), 598-601, 2007

    The Japanese Society for Dental Materials and Devices

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