成人腭部微种植体植入区域骨皮质密度的锥形束CT测量分析

Evaluation on palatal cortical bone density for mini-implant placement in adults by cone beam computed tomography

目的：利用锥形束CT（cone beam computed tomography,CBCT）测量腭部骨皮质密度,分析腭部骨皮质密度的分布规律。方法：选取107例20~40岁成人（男51例、女56例）的CBCT影像数据,测量腭部28个点位的骨皮质密度,以亨斯菲尔德单位（Hounsfield units,HU）表示,重复测量方差分析比较不同部位间骨密度差异,t检验比较骨密度的性别差异。结果：腭部各测量点位中骨皮质密度最大值为（976.24±138.66）HU,最小值为（460.45±183.33）HU。除Y0X0、Y8X0、Y8X6、Y12X6、Y20X6、Y20X9、Y24X6和Y24X9外,其余20个测量点位的骨皮质密度值性别差异有统计学意义（P〈0.05）。腭部骨皮质密度有由前向后递减的趋势（P=0.000）。腭前部中缝旁3 mm区域的骨皮质密度高于腭前部中缝区（P〈0.05）。结论：经CBCT获取了成人腭部骨皮质密度的分布规律,为腭部微种植体植入部位的选择提供了参考。

Objective：To evaluate the cortical bone densities of the palatal area using cone beam computed tomography（CBCT）.Methods：CBCT scans of 107 adults（51 men,56 women,20 to 40 years old）were selected and reconstructed. Palatal cortical bone density was measured in Hounsfield units（HU）at 28 sites. Repeated measures analysis of variance was used to test the intragroup differences of cortical bone density,and the relationship between gender were analyzed by t-test. Results：The maximum value of palatal cortical bone densities was（976.24±138.66）HU,and the minimum value was（460.45±183.33）HU. There were significant differences between the male and female groups in all sites（P〈0.05）,except Y0X0,Y8X0,Y8X6,Y12X6,Y20X6,Y20X9,Y24X6 and Y24X9. Palatal cortical bone densities showed a tendency to decrease posteriorly（P=0.000）. The cortical bone densities at locations that 3 mm from the midpalatal suture to lateral side were greater than at midpalatal suture in the anterior palate（P〈0.05）. Conclusion：The distribution of palatal cortical bone densities in adults are obtained by CBCT. These data might provide valuable information for selecting sites to place mini-implants in the palate.