Beer Andreas, Gahleitner André, Holm Anders, Tschabitscher Manfred, Homolka Peter
Department of Biomedical Engineering and Physics, University of Vienna, Vienna, Austria.
Clin Oral Implants Res. 2003 Oct;14(5):616-20. doi: 10.1034/j.1600-0501.2003.00932.x.
The aim of this study was to establish a correlation between bone mineral density measured preoperatively with dental computed tomography (CT), and insertion torque of screw-shaped dental implants.
In eight human mandibles obtained postmortem, bone mineral density (BMD) was measured with dental quantitative CT (DQCT) and correlated with insertion torque values at 45 implant sites during insertion of screw-shaped dental implants (Brånemark System MKIII, Nobel Biocare, AB, Göteborg, Sweden).
A significant correlation (r=0.86, P<0.001) between BMD and torque values was observed, indicating that local BMD at a specific implant position is related to the supportive capacity of the jawbone. BMD exhibited no correlation with bone height or position.
The noninvasive assessment of BMD using a DQCT scan employing a low-dose protocol may be used to estimate expected primary stability depending on BMD, implant type and preparation procedure. These data may therefore help the surgeon to select the optimum implant position, implant type and operation technique.
本研究旨在建立术前通过牙科计算机断层扫描（CT）测量的骨密度与螺旋形牙种植体植入扭矩之间的相关性。
在8例死后获取的人类下颌骨中，使用牙科定量CT（DQCT）测量骨密度，并将其与螺旋形牙种植体（Brånemark系统MKIII，诺贝尔生物保健公司，瑞典哥德堡）植入过程中45个种植位点的植入扭矩值相关联。
观察到骨密度与扭矩值之间存在显著相关性（r = 0.86，P < 0.001），表明特定种植位置的局部骨密度与颌骨的支持能力相关。骨密度与骨高度或位置无相关性。
使用低剂量方案的DQCT扫描对骨密度进行无创评估，可用于根据骨密度、种植体类型和制备程序估计预期的初期稳定性。因此，这些数据可能有助于外科医生选择最佳的种植位置、种植体类型和手术技术。
