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The International Journal of Oral & Maxillofacial Implants



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Int J Oral Maxillofac Implants 29 (2014), No. 2     21. Mar. 2014
Int J Oral Maxillofac Implants 29 (2014), No. 2  (21.03.2014)

Page 402-406, doi:10.11607/jomi.2804, PubMed:24683566

The Effect of Graft Bone Particle Size on Bone Augmentation in a Rabbit Cranial Vertical Augmentation Model: A Microcomputed Tomography Study
Kon, Kazuhiro / Shiota, Makoto / Ozeki, Maho / Kasugai, Shohei
Purpose: The purpose of this study was to investigate the impact of graft bone particle size on autogenous
bone graft augmentation in a vertical augmentation chamber model. Materials and Methods: A total of 12
rabbits were used in this study. The donor bone particles were of different sizes: small (150 to 400 μm), large
(1.0 to 2.0 mm), and a mixture comprising equal weights of both large and small bone particles. One type
of bone graft material was placed into each of two polytetrafluoroethylene chambers that were implanted
in the parietal bone of each rabbit's cranium. Animals were sacrificed 4 or 8 weeks after the grafting
procedure. The recovered samples were analyzed by microcomputed tomography (micro-CT) for quantitative
analysis. Total bone volume, bone height, and the distribution of bone structure were calculated by micro-CT.
Results: Micro-CT evaluations revealed that the bone grafts performed with large bone particles provided,
statistically, the best outcome. Total bone volume and bone height decreased in a time-dependent manner,
and there was a statistically significant reduction in total bone volume between 4 and 8 weeks in the group
with the mixed bone particle sizes. Conclusion: Within the limitations of the present study, large bone graft
particles provided the best preservation of total bone volume and bone height up to 8 weeks after grafting in
an animal vertical augmentation model.

Keywords: animal study, autogenous bone particle size, micro-CT, vertical augmentation graft