Machining Accuracy of CAD/CAM Ceramic Crowns Fabricated with Repeated Machining Using the Same Diamond Bur

Sachiko TOMITA; Akiyoshi SHIN-YA; Harunori GOMI; Tetsuji MATSUDA; Shingo KATAGIRI; Akikazu SHIN-YA; Hitosi SUZUKI; Atsushi YARA; Hideo OGURA; Yasuhiro HOTTA; Takashi MIYAZAKI; Yuuki SAKAMOTO

doi:10.4012/dmj.24.123

Sachiko TOMITA, Akiyoshi SHIN-YA, Harunori GOMI, Tetsuji MATSUDA, Shingo KATAGIRI, Akikazu SHIN-YA, Hitosi SUZUKI, Atsushi YARA, Hideo OGURA, Yasuhiro HOTTA, Takashi MIYAZAKI, Yuuki SAKAMOTO

Author information

Sachiko TOMITA
Department of Crown and Bridge, School of Dentistry at Tokyo, The Nippon Dental University
Akiyoshi SHIN-YA
Department of Crown and Bridge, School of Dentistry at Tokyo, The Nippon Dental University
Harunori GOMI
Department of Crown and Bridge, School of Dentistry at Tokyo, The Nippon Dental University
Tetsuji MATSUDA
Department of Crown and Bridge, School of Dentistry at Tokyo, The Nippon Dental University
Shingo KATAGIRI
Department of Crown and Bridge, School of Dentistry at Tokyo, The Nippon Dental University
Akikazu SHIN-YA
Department of Crown and Bridge, School of Dentistry at Tokyo, The Nippon Dental University
Hitosi SUZUKI
ADVANCE Ltd.
Atsushi YARA
Department of Dental Materials Science, School of Dentistry at Niigata, The Nippon Dental University
Hideo OGURA
Department of Dental Materials Science, School of Dentistry at Niigata, The Nippon Dental University
Yasuhiro HOTTA
Department of Oral Biomaterials and Technology, Showa University School of Dentistry
Takashi MIYAZAKI
Department of Oral Biomaterials and Technology, Showa University School of Dentistry
Yuuki SAKAMOTO
GC Corporation

Keywords: CAD/CAM, Ceramic crowns, Machining accuracy, Diamond bur, Repeated machining

JOURNAL FREE ACCESS

2005 Volume 24 Issue 1 Pages 123-133

DOI https://doi.org/10.4012/dmj.24.123

Details

Abstract

The purpose of this study was to investigate the effect of repeated machining up to 51 times using the same diamond bur on machining accuracy of inner and outer surfaces of CAD/CAM (computer-aided designing and computer-aided manufacturing) machined ceramic crowns. The surface topography of machined crowns was examined using photographs. It was found that machining accuracy was not affected by the number of machining times. In all measuring points, the inner surface was machined to a dimension larger than the die model (i. e., increased gap), whereas the outer surface was machined to a dimension smaller than the crown model (i. e., smaller crown). Photo observation showed that cervical contour was machined in a clear, rounded form from 1^st to 11^th crowns.

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