THE BULLETIN OF TOKYO DENTAL COLLEGE

Vol. 48 No. 3      August 2007

ISSN: 0040-8891      UBIC: 66

Abstract

The purpose of this study was to analyze changes in the internal structure of zygornatic bone using a micro-finite element analysis model (/zFEA) and compare angular orientation of trabeculae against compressive forcé in edentulous and dentulous jaws. Twenty zygomatic bones from dentulous jaws and 20 zygomatic bones from edentulous jaws harvested frornJapanese male cadavers were used. From 2-dimensional slice images, we reconstructed 3-dimensional (3D) structure by the volume rendering method using micro-computed tomography (micro-CT). To analyze mechanical properties, all voxeis were converted to /íFEA models. The angle between the strongest directíon of trabecular bone and the axial loading directíon (angle o') was then determined using the ¿U.FEA models. In the 3-D reconstruction images, trabecular density in dentulous jaws was higher than that in edentulous jaws at all loci. Trabeculae in dentulous jaws showed a plate-like structure. The /AFEA modeling revealed that the angle ofthe trabeculae at theJugale in edentulous jaws was lower than that in dentulous jaws. This suggests that the internal structure of trabeculae is influenced by occiusal forcé in zygomatic bone from edentulous jaws. Key words: Zygomatic bone-Micro-CT-Japanese cadavers-Bone histomorphometry-Finite element analysis.

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