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Korean J Oral Maxillofac Radiol. 2008 Jun;38(2):81-87. Korean. Original Article.
Park KS , Lee SS , Huh KH , Yi WJ , Heo MS , Choi SC .
Department of Oral and Maxillofacial Radiology, School of Dentistry, Seoul National Universit, Seoul, Korea.
Department of Dentistry, Inje University Sanggye Paik Hospital, Seoul, Korea.
Dental Research Institute, School of Dentistry, Seoul National University, Seoul, Korea.
BK21, School of Dentistry, Seoul National University, Seoul, Korea.

PURPOSE: To investigate the relationship between 3D bone architectural parameters and direction-related elastic moduli of cancellous bone of mandibular condyle. MATERIALS AND METHODS: Two micro-pigs (Micro-pig(R), PWG Genetics Korea) were used. Each pig was about 12 months old and weighing around 44 kg. 31 cylindrical bone specimen were obtained from cancellous bone of condyles for 3D analysis and measured by micro-computed tomography. Six parameters were trabecular thickness (Tb.Th), bone specific surface (BS/BV), percent bone volume (BV/TV), structure model index (SMI), degree of anisotropy (DA) and 3-dimensional fractal dimension (3DFD). Elastic moduli of three orthogonal directions (superiorinferior (SI), medial-lateral (ML), andterior-posterior (AP) direction) were calculated through finite element analysis. RESULTS: Elastic modulus of superior-inferior direction was higher than those of other directions. Elastic moduli of 3 orthogonal directions showed different correlation with 3D architectural parameters. Elastic moduli of SI and ML directions showed significant strong to moderate correlation with BV/TV, SMI and 3DFD. CONCLUSION: Elastic modulus of cancellous bone of pig mandibular condyle was highest in the SI direction and it was supposed that the change into plate-like structure of trabeculae was mainly affected by increase of trabeculae of SI and ML directions.

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