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Article type: Cover
2010 Volume 38 Issue 1 Pages
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Article type: Index
2010 Volume 38 Issue 1 Pages
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Kazuo Hayashi, Sadamasa Saitoh, Jun Uechi, Masahiro Konno, Itaru Mizog ...
Article type: Article
2010 Volume 38 Issue 1 Pages
1-9
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The purpose of this study was to establish the threshold CT value for reconstructing 3D-CT TMJ images. In this study, CT scans were performed on 10 subjects and a dry skull. First, to identify the characteristics of the system used in this study, three-dimensional (3D) surface models were constructed based on the data obtained under three threshold CT values (+255, +400, and +600 Hounsfield Units (HU)). To make a standard model, 3D-surface images of the dry skull were also scanned by a noncontact 3D laser scanner. When the CT-value threshold was low (+255 HU), the fossa and condyle partially overlapped in reconstructed 3D images. Next, the mean threshold CT value for all 10 subjects was calculated by taking into account the results of reconstruction with a CT value of +580 HU. The present results suggest that an appropriate 3D shape and positional relationship between the fossa and condyle can be obtained by setting the CT value at +530 HU as a lower threshold. However, it is also important to clarify the proper threshold for the CT value at each anatomic location.
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Yoshiaki Sato, Akihiro Kadono, Saburo Obara, Toyohisa Kusakabe, Satima ...
Article type: Article
2010 Volume 38 Issue 1 Pages
10-16
Published: December 25, 2010
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To estimate the skeletal antero-postero jaw relation from soft tissue profiles on laypersons or artistic products, a regression equation between the soft tissue profile and the skeletal antero-postero jaw relation was established from data for malocclusion patients with cephalograms. Eighty pretreatment lateral cephalograms of malocclusion patients who had visited our orthodontic clinic of Hokkaido University Hospital from 2002 to 2008 were used. The ANB angle on the hard tissue and the Sn-Ns-Pogs angle on the soft tissue, which was constructed from the subnasale point (Sn), the soft tissue nasion (Ns), and the soft tissue pogonion (Pogs), was measured from the cephalograms, and a regression equation between the Sn-Ns-Pogs angle and the ANB angle was calculated. Then the ANB angle of the laypersons were estimated from the Sn-Ns-Pogs angle of the lateral facial photographs we had as data. The results were as follows: (1) Mean values of the Sn-Ns-Pogs angle and the ANB angle were 7.8 degrees and 3.6 degrees, respectively. (2) The correlation coefficient between the Sn-Ns-Pogs angle and the ANB angle was r=0.84. The regression equation was y=0.73x-2.00, with the determination coefficient r^2=0.70. (3) The estimated ANB angle of the laypersons from the Sn-Ns-Pogs angle of the lateral facial photographs was 5.0 degrees as the mean value.
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Hiroshi Iwasaki, Junichiro Iida
Article type: Article
2010 Volume 38 Issue 1 Pages
17-27
Published: December 25, 2010
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Satoshi Wada, Yoshiaki Sato, Junichiro Iida
Article type: Article
2010 Volume 38 Issue 1 Pages
28-37
Published: December 25, 2010
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[in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
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[in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
40-
Published: December 25, 2010
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[in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
40-41
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2010 Volume 38 Issue 1 Pages
41-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2010 Volume 38 Issue 1 Pages
41-42
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[in Japanese], [in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
42-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
43-
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[in Japanese], [in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
43-44
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2010 Volume 38 Issue 1 Pages
44-
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
Article type: Article
2010 Volume 38 Issue 1 Pages
44-45
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[in Japanese], [in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
46-47
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
48-49
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Article type: Article
2010 Volume 38 Issue 1 Pages
50-51
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Article type: Article
2010 Volume 38 Issue 1 Pages
52-53
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Article type: Article
2010 Volume 38 Issue 1 Pages
54-55
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[in Japanese], [in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
56-57
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[in Japanese], [in Japanese], [in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
58-59
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2010 Volume 38 Issue 1 Pages
60-61
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Article type: Article
2010 Volume 38 Issue 1 Pages
62-63
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Article type: Article
2010 Volume 38 Issue 1 Pages
64-65
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[in Japanese]
Article type: Article
2010 Volume 38 Issue 1 Pages
66-
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Article type: Article
2010 Volume 38 Issue 1 Pages
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Article type: Appendix
2010 Volume 38 Issue 1 Pages
68-69
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Article type: Appendix
2010 Volume 38 Issue 1 Pages
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Article type: Appendix
2010 Volume 38 Issue 1 Pages
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Article type: Appendix
2010 Volume 38 Issue 1 Pages
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Article type: Appendix
2010 Volume 38 Issue 1 Pages
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2010 Volume 38 Issue 1 Pages
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Article type: Appendix
2010 Volume 38 Issue 1 Pages
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Article type: Appendix
2010 Volume 38 Issue 1 Pages
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2010 Volume 38 Issue 1 Pages
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Article type: Appendix
2010 Volume 38 Issue 1 Pages
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2010 Volume 38 Issue 1 Pages
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2010 Volume 38 Issue 1 Pages
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Article type: Appendix
2010 Volume 38 Issue 1 Pages
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Article type: Appendix
2010 Volume 38 Issue 1 Pages
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Article type: Cover
2010 Volume 38 Issue 1 Pages
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Article type: Cover
2010 Volume 38 Issue 1 Pages
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