THE BULLETIN OF TOKYO DENTAL COLLEGE

Vol. 47 No. 4      November 2006

ISSN: 0040-8891      UBIC: 66

Abstract

The purpose of the present study was to evaluate stress distribution by finite element analysis in an accurate model simulating trabecular bone using micro-CT. Dentulous and edentulous maxillary jaws of Japanese adult cadavers were used (5 sides each; total, 10 sides). Imaging was performed using a micro-CT, followed by reconstruction with 3-D images. Finite element analysis models were developed using the maxilla with average bone morphometry. A load corresponding to occlusal force was applied in different loading conditions, followed by evaluation of stress distribution. In dentulous maxillas, a load was applied in the dental axis direction to the first molar crown (LD). In edentulous maxillas, a load was applied directly to a circular area 4mm in diameter (LERO) to a cylinder 4mm in diameter and 10 mm in height (LER1O) corresponding to the first molar area. Stress was concentrated in cortical bone around the first molar, trabecular bone and cortical bone at the maxillary sinus base in LD, cortical bone of the alveolar ridge in LERO, and trabecular bone around the cylinder and cortical bone at the maxillary sinus base in LER1O. LERO showed a stress distribution markedly different from that in LD. Compared with LERO, LER1O showed a stress distribution close to that in LD. A model simulating trabecular bone allows a more accurate evaluation of stress distribution. Key words: Maxilla. Micro-CT. Finite element analysis. Stress distribution

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