Table of Contents
ISRN Dentistry
Volume 2011, Article ID 678729, 5 pages
Research Article

Preoperative Computed Tomography-Derived Bone Densities in Hounsfield Units at Implant Sites Acquired Primary Stability

Division of Cervico-Gnathostomatology, Department of Advanced Prosthodontics, Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima 734-8553, Japan

Received 1 September 2011; Accepted 27 September 2011

Academic Editor: M. I. Ryder

Copyright Β© 2011 Kyou Hiasa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The purpose of this study was to evaluate preoperative CT-derived bone densities in Hounsfield units (HU) at implant sites that acquired primary stability, and to compare these values to the optimal bone densities proposed in the literature. Fifty-one patients, 18 males (37 implant sites) and 33 females (67 implant sites) between 2003 and 2010 were assessed. CT data for different jaw sections, regions, and operating procedures were compared using the Kruskal-Wallis test and Scheffe's test for multiple comparisons ( 𝑃 < 0 . 0 5 ). The mean bone density in the maxilla was significantly lower than that in the mandible ( 𝑃 < 0 . 0 5 ); the mean bone densities in the 4 jaw regions decreased in the following order: anterior mandible > anterior maxilla > posterior mandible > posterior maxilla. The bone densities assessed by HU fell into the range of optimal bone densities associated with acquired primary implant stability proposed in the literature.