School of Dentistry, University of São Paulo, São Paulo, SP, Brazil.
Int J Oral Maxillofac Surg. 2011 Nov;40(11):1280-8. doi: 10.1016/j.ijom.2011.05.015. Epub 2011 Jun 22.
The aim of this study was to determine the quantitative assessment of bone volume defects using multislice computed tomography (CT), and to establish an image processing protocol that enables this analysis. Bone defects were created in nine dry skulls, to mimic oral clefts. All the defects were modelled with wax, following the contralateral shape of the alveolo-palatal region. The wax was used to obtain the real volume of the cleft (gold standard). The skulls (with and without wax) were submitted to multislice CT examination, and the images were processed in an independent workstation using volumetric software. All the images were analysed twice, by two examiners at different times, performing intra- and inter-examiner analyses. The results show that the protocol for image processing has high efficiency (P=0.995). Multislice CT showed excellent results, with high reliability in the study of bone defect volume (P=0.997). The intra- and inter-observer analysis showed no statistically significant differences. It was demonstrated that multislice CT is a reliable technique in the volumetric assessment of bone defects in the alveolar and palatal regions, and that this method was efficient for calculating the volume of the clefts.
本研究旨在通过多层螺旋 CT 对骨量缺损进行定量评估，并建立一种能够进行这种分析的图像处理方案。在 9 个干燥的颅骨中创建了骨缺损，以模拟口腔裂隙。所有的缺损都是用蜡模制成的，模仿了牙槽-腭部的形状。蜡用于获得裂隙的真实体积（金标准）。颅骨（有和没有蜡）进行多层 CT 检查，图像在独立工作站上使用体积软件进行处理。所有的图像都由两名检查者在不同的时间进行两次分析，进行了内部和外部检查者的分析。结果表明，图像处理方案具有高效性（P=0.995）。多层 CT 显示了出色的结果，在骨缺损体积的研究中具有高度的可靠性（P=0.997）。内部和外部观察者分析显示没有统计学上的显著差异。证明多层 CT 是一种可靠的技术，可用于评估牙槽和腭部的骨缺损体积，并且该方法可有效计算裂隙的体积。
