Department of Oral Diagnosis and Radiology, School of Dentistry, Ege University, Turkey.
Int J Oral Maxillofac Implants. 2012 Sep-Oct;27(5):1009-13.
To evaluate the combination of fractal dimension (FD), lacunarity, and Feret diameter (FeD) to quantitatively characterize structural changes of mandibular alveolar bone around dental implants during initial healing.
Three standard-sized regions of interest (ROIs) (mesial and distal crest and apical area) around implants and three ROIs of the same size in the alveolar bone on the contralateral side were analyzed on digital panoramic images. FD was calculated using the box-counting method, and lacunarity was calculated using the FracLac plugin of Image J software. FeD was measured in the same ROIs. Comparisons of the groups were done with the Dunnett test.
Forty-two implants in the posterior mandibles of 21 patients were used for FD measurements. A total of 189 ROIs was segmented into binary images. Mean FD values for mesial, distal, and apical ROIs around implants were 1.26, 1.36, and 1.4, respectively. The mean FD of alveolar bone around premolars/molars was 1.39 for all ROIs. The mean FeD for mesial, distal, and apical ROIs around implants was 7.63, 7.86, and 8.02, respectively, whereas it ranged between 7.88 and 8.13 for premolar teeth. Mean lacunarity values for mesial, distal, and apical ROIs around implants were 0.53, 0.51, and 0.48, respectively. Lacunarity values for ROIs around premolars ranged between 0.45 and 0.50. No significant differences were observed in FD, FeD, or lacunarity measurements between ROIs around implants and around teeth.
The satisfactory healing of bone following implant placement may be monitored by calculating FD, lacunarity, and FeD using digital panoramic images. Although preliminary, these values may alert the practitioner to any implants with loss of stability.
评估分形维数（FD）、空隙度和 Feret 直径（FeD）的组合，以定量描述种植体周围下颌牙槽骨在初始愈合过程中的结构变化。
在数字化全景图像上分析种植体周围的三个标准感兴趣区域（ROI）（近中和远中嵴和根尖区）和对侧牙槽骨中相同大小的三个 ROI。使用盒计数法计算 FD，使用 Image J 软件的 FracLac 插件计算空隙度。在相同的 ROI 中测量 FeD。使用 Dunnett 检验进行组间比较。
21 名患者的 42 个后下颌种植体用于 FD 测量。共分割 189 个 ROI 成二进制图像。种植体周围近中、远中和根尖 ROI 的平均 FD 值分别为 1.26、1.36 和 1.4。所有 ROI 中，前磨牙/磨牙周围牙槽骨的平均 FD 值为 1.39。种植体周围近中、远中和根尖 ROI 的平均 FeD 分别为 7.63、7.86 和 8.02，而前磨牙的范围在 7.88 至 8.13 之间。种植体周围近中、远中和根尖 ROI 的平均空隙度值分别为 0.53、0.51 和 0.48，而前磨牙周围 ROI 的空隙度值在 0.45 至 0.50 之间。种植体周围 ROI 与牙齿周围 ROI 的 FD、FeD 或空隙度测量值无显著差异。
使用数字化全景图像计算 FD、空隙度和 FeD 可以监测种植体植入后骨的愈合情况。尽管初步研究，但这些值可能会提醒医生注意任何稳定性丧失的种植体。
