Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, State University of Campinas, Piracicaba, São Paulo, Brazil.
Oral Surg Oral Med Oral Pathol Oral Radiol. 2013 Jan;115(1):121-7. doi: 10.1016/j.oooo.2012.10.003.
To assess the accuracy of cone-beam computed tomography (CBCT) in periimplant fenestration and dehiscence detection, and to determine the effects of 2 voxel sizes and scan modes.
One hundred titanium implants were placed in bovine ribs in which periimplant fenestration and dehiscence were simulated. CBCT images were acquired with the use of 3 protocols of the i-CAT NG unit: A) 0.2 mm voxel size half-scan (180°); B) 0.2 mm voxel size full-scan (360°); and C) 0.12 mm voxel size full scan (360°). Receiver operating characteristic curves and diagnostic values were obtained. The Az values were compared with the use of analysis of variance.
The Az value for dehiscence in protocol A was significantly lower than those of B or C (P < .01). They did not statistically differ for fenestration (P > .05).
Protocol B yielded the highest values. The voxel sizes did not affect fenestration and dehiscence detection, and for dehiscence full-scan performed better than half-scan.
评估锥形束 CT（CBCT）在种植体周围开窗和骨开裂检测中的准确性，并确定两种体素大小和扫描模式的影响。
将 100 个钛种植体植入牛肋骨中，模拟种植体周围开窗和骨开裂。使用 i-CAT NG 设备的 3 种方案获取 CBCT 图像：A）0.2mm 体素大小半扫描（180°）；B）0.2mm 体素大小全扫描（360°）；C）0.12mm 体素大小全扫描（360°）。获得受试者工作特征曲线和诊断值。使用方差分析比较 Az 值。
方案 A 中骨开裂的 Az 值显著低于方案 B 或 C（P<.01）。对于开窗，它们之间没有统计学差异（P>.05）。
方案 B 产生的结果最高。体素大小对开窗和骨开裂检测没有影响，对于骨开裂，全扫描优于半扫描。
