Wang Shiuan-Hui, Shen Yen-Wen, Fuh Lih-Jyh, Peng Shin-Lei, Tsai Ming-Tzu, Huang Heng-Li, Hsu Jui-Ting
Master Program for Biomedical Engineering, China Medical University, Taichung 404, Taiwan.
School of Dentistry, China Medical University, Taichung 404, Taiwan.
Diagnostics (Basel). 2020 Sep 17;10(9):710. doi: 10.3390/diagnostics10090710.
Dental implant surgery is a common treatment for missing teeth. Its survival rate is considerably affected by host bone quality and quantity, which is often assessed prior to surgery through dental cone-beam computed tomography (CBCT). Dental CBCT was used in this study to evaluate dental implant sites for (1) differences in and (2) correlations between cancellous bone density and cortical bone thickness among four regions of the jawbone. In total, 315 dental implant sites (39 in the anterior mandible, 42 in the anterior maxilla, 107 in the posterior mandible, and 127 in the posterior maxilla) were identified in dental CBCT images from 128 patients. All CBCT images were loaded into Mimics 15.0 to measure cancellous bone density (unit: grayscale value (GV) and cortical bone thickness (unit: mm)). Differences among the four regions of the jawbone were evaluated using one-way analysis of variance and Scheffe's posttest. Pearson coefficients for correlations between cancellous bone density and cortical bone thickness were also calculated for the four jawbone regions. The results revealed that the mean cancellous bone density was highest in the anterior mandible (722 ± 227 GV), followed by the anterior maxilla (542 ± 208 GV), posterior mandible (535 ± 206 GV), and posterior maxilla (388 ± 206 GV). Cortical bone thickness was highest in the posterior mandible (1.15 ± 0.42 mm), followed by the anterior mandible (1.01 ± 0.32 mm), anterior maxilla (0.89 ± 0.26 mm), and posterior maxilla (0.72 ± 0.19 mm). In the whole jawbone, a weak correlation ( = 0.133, = 0.041) was detected between cancellous bone density and cortical bone thickness. Furthermore, except for the anterior maxilla ( = 0.306, = 0.048), no correlation between the two bone parameters was observed (all > 0.05). Cancellous bone density and cortical bone thickness varies by implant site in the four regions of the jawbone. The cortical and cancellous bone of a jawbone dental implant site should be evaluated individually before surgery.
牙种植手术是治疗牙齿缺失的常见方法。其成功率受宿主骨质量和数量的显著影响，术前常通过牙科锥形束计算机断层扫描（CBCT）进行评估。本研究使用牙科CBCT评估牙种植部位，以研究（1）颌骨四个区域的松质骨密度和皮质骨厚度的差异，以及（2）它们之间的相关性。在128例患者的牙科CBCT图像中，共识别出315个牙种植部位（下颌前部39个，上颌前部42个，下颌后部107个，上颌后部127个）。所有CBCT图像均导入Mimics 15.0软件，以测量松质骨密度（单位：灰度值（GV））和皮质骨厚度（单位：mm）。采用单因素方差分析和谢费尔事后检验评估颌骨四个区域之间的差异。同时计算四个颌骨区域的松质骨密度与皮质骨厚度之间的Pearson相关系数。结果显示，下颌前部的松质骨平均密度最高（722±227 GV），其次是上颌前部（542±208 GV）、下颌后部（535±206 GV）和上颌后部（388±206 GV）。皮质骨厚度在下颌后部最高（1.15±0.42 mm），其次是下颌前部（1.01±0.32 mm）、上颌前部（0.89±0.26 mm）和上颌后部（0.72±0.19 mm）。在整个颌骨中，松质骨密度与皮质骨厚度之间存在弱相关性（r = 0.133，P = 0.041）。此外，除上颌前部外（r = 0.306，P = 0.048），未观察到两个骨参数之间的相关性（所有P>0.05）。颌骨四个区域的牙种植部位的松质骨密度和皮质骨厚度各不相同。术前应分别评估颌骨牙种植部位的皮质骨和松质骨。
