Changes in mechanical properties of bone within the mandibular condyle with age
Version of Record online: 9 OCT 2007
Copyright © 2007 Wiley-Liss, Inc.
Journal of Morphology
Volume 269, Issue 2, pages 138–143, February 2008
How to Cite
Huja, S. S., Rummel, A. M. and Beck, F. M. (2008), Changes in mechanical properties of bone within the mandibular condyle with age. J. Morphol., 269: 138–143. doi: 10.1002/jmor.10582
- Issue online: 27 DEC 2007
- Version of Record online: 9 OCT 2007
- NIDCR. Grant Number: R03 DE015233
- mechanical properties;
The purpose of the study was to compare indentation modulus (IM) and hardness of condylar bone in young and adult dogs. In addition we desired to examine histologic sections for bone formation activity in the two groups. Mandibular condyles were obtained from adult (1- to 2-year-old) and young (∼5-m old) dogs. Two sections/condyle were obtained and one was processed for histomorphometry and the other for mechanical analyses. Indents were made on moist condylar trabecular bone to a depth of 500 nm at a loading rate of 10 nm/s using a custom-made hydration system to obtain IM and hardness. Histomorphometric analyses measured the bone volume/total volume (BV/TV%) and ratio of labeled to unlabeled bone within the condyle. Data were analyzed using a repeated-measures factorial analysis of variance and Tukey–Kramer method. Overall, the IM of the adult condyles (10.0 ± 3.4 GPa, Mean ± SD) were significantly (P < 0.0001) higher than in young dogs (5.6 ± 2.6 GPa). There was a greater bone mass in the young (60.2%) versus the adult condyles (42%). Also, significantly more labeled bone in the young (66.1%) condylar bone suggested higher bone forming activity than in adult condyles (27.5%). With age there is a change in mass and material properties in the trabecular bone of the mandibular condyle in dogs. J. Morphol., 2008. © 2007 Wiley-Liss, Inc.