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

Takashi NAKAMURA; Kazumichi WAKABAYASHI; Yoshiko KAWAMURA; Soichiro KINUTA; Yoshihiko MUTOBE; Hirofumi YATANI

doi:10.4012/dmj.26.598

Technical reports

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

Takashi NAKAMURA, Kazumichi WAKABAYASHI, Yoshiko KAWAMURA, Soichiro KINUTA, Yoshihiko MUTOBE, Hirofumi YATANI

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Keywords: MicroCT, All-ceramic crown, Internal defect

JOURNAL FREE ACCESS

2007 Volume 26 Issue 4 Pages 598-601

DOI https://doi.org/10.4012/dmj.26.598

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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.
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.
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.

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