Doi Kazuya, Wakamatsu Kaien, Kobatake Reiko, Oki Yoshifumi, Makihara Yusuke, Konishi Masaru, Tsuga Kazuhiro
Department of Advanced Prosthodontics, Hiroshima University Graduate School of Biomedical and Health Sciences, 1-2-3 Kasumi, Minami-ku, Hiroshima City, 734-8553, Hiroshima, Japan.
Department of Oral and Maxillofacial Radiology, Hiroshima University Hospital, 1-2-3 Kasumi, Minami-ku, Hiroshima City, 734-8551, Hiroshima, Japan.
Int J Implant Dent. 2025 Jan 31;11(1):7. doi: 10.1186/s40729-025-00596-9.
The study aimed to examine the usefulness of a novel density measurement drill for evaluating cancellous bone density by examining the correlation between computed tomography (CT)-based Misch bone density classification and drilling torque value.
Bovine ribs were used as the drilling sites for implant placement. Multidetector CT (MDCT) was performed after contrast materials were attached to the drilling sites. CT value within the region of interest (ROI) on MDCT scan was measured and classified according to the Misch classification (D1 to D5). Drilling torque value was measured using a novel measurement drill. Next, histomorphometric analysis of the drilling site was performed to assess bone density, expressed as percentage of bone area within ROI.
MDCT showed the presence of D2 (n = 87), D3 (n = 92), D4 (n = 133), and D5 (n = 52) at the measurement sites, however, no sites were classified as D1. The drilling torque values were 11.2 ± 3.2 Ncm for D2, 7.8 ± 3.3 Ncm for D3, and 3.0 ± 1.2 Ncm for D4, and 1.4 ± 0.6 Ncm for D5, with significant differences. A positive correlation was observed between CT value and drilling torque value (r = 0.99). Histomorphometric analysis revealed a positive correlation between drilling torque value and bone area ratio (r = 0.97).
The results of this limited study demonstrated the usefulness of the direct and objective cancellous bone density evaluation method using a novel measurement drill. This evaluation method will be informative for subsequent treatment decisions.
本研究旨在通过检测基于计算机断层扫描（CT）的米施骨密度分类与钻孔扭矩值之间的相关性，来检验一种新型密度测量钻头在评估松质骨密度方面的实用性。
使用牛肋骨作为种植体植入的钻孔部位。在钻孔部位附着对比剂后进行多排螺旋CT（MDCT）扫描。测量MDCT扫描感兴趣区域（ROI）内的CT值，并根据米施分类法（D1至D5）进行分类。使用新型测量钻头测量钻孔扭矩值。接下来，对钻孔部位进行组织形态计量学分析，以评估骨密度，用ROI内骨面积的百分比表示。
MDCT显示测量部位存在D2（n = 87）、D3（n = 92）、D4（n = 133）和D5（n = 52），但没有部位被分类为D1。D2的钻孔扭矩值为11.2±3.2 Ncm，D3为7.8±3.3 Ncm，D4为3.0±1.2 Ncm，D5为1.4±0.6 Ncm，差异有统计学意义。CT值与钻孔扭矩值之间存在正相关（r = 0.99）。组织形态计量学分析显示钻孔扭矩值与骨面积比之间存在正相关（r = 0.97）。
这项有限研究的结果证明了使用新型测量钻头进行直接、客观的松质骨密度评估方法的实用性。这种评估方法将为后续治疗决策提供信息。
