Influence of metal artifacts on <I>in vivo</I> micro-CT for orthodontic mini-implants
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概要
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This study aimed to show the effects of metal artifacts on the <I>in vivo</I> micro-CT of mini-implants by measuring bone volume. We drilled a hole in the cortical bone of a rat tibia and embedded a titanium orthodontic mini-implant (diameter, 1.5 mm) in the hole. Twelve individually weighed hydroxyapatite grains (HA grains) were placed around the implant either by one dentist (method 1) or separately by 12 dentists (method 2). <I>In vivo</I> micro-CT was used to scan the model after placement of each grain to measure increases and decreases in bone volume voxel number. The subtracted bone voxel volume increased with HA weight in both methods. Simple linear regression analysis showed a significant correlation between weight and volume in both methods (method 1: regression coefficient: 516.502, <I>P </I>< 0.05; method 2: regression coefficient: 4837.432, <I>P </I>< 0.05). Metal artifacts did not appear to influence measurements of bone volume, although further studies are required to determine the effect of thicker implants. (J Oral Sci 54, 55-59, 2012)
著者
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Arai Yoshinori
Nihon University School of Dentistry
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Honda Kazuya
Department Of Oral Radiology Nihon University School Of Dentistry
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Shimizu Noriyoshi
Department Of Orthodontics Nihon University School Of Dentistry
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Motoyoshi Mitsuru
Department Of Orthodontics Nihon University School Of Dentistry
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Ejima Ken-ichiro
Department of Oral and Maxillofacial Radiology, Nihon University, School of Dentistry
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Omasa Saori
Department of Orthodontics, Nihon University, School of Dentistry
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Kai Yukiko
Department of Oral and Maxillofacial Radiology, Nihon University, School of Dentistry
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Amemiya Toshihiko
Department of Oral and Maxillofacial Radiology, Nihon University, School of Dentistry
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Yamada Hisaya
Department of Oral and Maxillofacial Radiology, Nihon University, School of Dentistry
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