Shapurian Tannaz, Damoulis Petros D, Reiser Gary M, Griffin Terrence J, Rand William M
Department of Periodontology, Tufts University School of Dental Medicine, Boston, Massachusetts 02111, USA.
Int J Oral Maxillofac Implants. 2006 Mar-Apr;21(2):290-7.
The primary aims of this retrospective study were to: (1) evaluate bone quality in different segments of the edentulous jaw and correlate it with demographic data and (2) establish a quantitative and objective assessment of bone quality based on the Hounsfield scale.
One hundred one randomly selected computerized tomographic (CT) scans were used for the analysis. Edentulous segments ranging from 10 to 30 mm were selected for evaluation, and the findings were analyzed and correlated to demographics. Implant recipient sites were evaluated visually for bone classification by 2 independent examiners. The same sites were subsequently evaluated digitally using the Hounsfield scale, and the results were correlated with the visual classification.
The 4 quadrants of the mouth displayed Hounsfield unit (HU) values ranging from -240 HU to 1,159 HU. The highest unit/mean density value (559 +/- 208 HU) was found in the anterior mandible, followed by 517 +/- 177 HU for the anterior maxilla, 333 +/- 199 HU for the posterior maxilla, and 321 +/- 132 HU for the posterior mandible. There was no association between the Hounsfield value and density and age or gender. When subjective bone quality was correlated to Hounsfield index findings, only the relationship between HU and type 4 bone was found to be significant.
Knowledge of the Hounsfield value as a quantitative measurement of bone density can be helpful as a diagnostic tool. It can provide the implant surgeon with an objective assessment of bone density, which could result in modification of surgical techniques or extended healing time, especially in situations where poor bone quality is suspected.
本回顾性研究的主要目的是：（1）评估无牙颌不同节段的骨质量，并将其与人口统计学数据相关联；（2）基于亨氏单位建立骨质量的定量和客观评估。
随机选取101例计算机断层扫描（CT）进行分析。选取长度为10至30毫米的无牙节段进行评估，并将结果进行分析并与人口统计学数据相关联。由2名独立检查者对种植体植入部位进行肉眼骨分类评估。随后使用亨氏单位对相同部位进行数字化评估，并将结果与肉眼分类结果相关联。
口腔的4个象限显示亨氏单位（HU）值范围为-240 HU至1159 HU。在前下颌骨中发现最高的单位/平均密度值（559±208 HU），其次是上颌前牙区为517±177 HU，上颌后牙区为333±199 HU，下颌后牙区为321±132 HU。亨氏值和密度与年龄或性别之间无关联。当主观骨质量与亨氏指数结果相关时，仅发现HU与4型骨之间的关系具有统计学意义。
了解亨氏值作为骨密度的定量测量方法，可作为一种有用的诊断工具。它可为种植外科医生提供骨密度的客观评估，这可能导致手术技术的改进或延长愈合时间，特别是在怀疑骨质量较差的情况下。
