Denton, Manchester M34 6DH, UK.
J Dent. 2011 Nov;39(11):764-70. doi: 10.1016/j.jdent.2011.08.008. Epub 2011 Aug 19.
A three dimensional appreciation of the form of the anterior mandible is required to place dental implants safely in the region. This study compared the subjective image quality of four available methods of cross sectional imaging of the symphyseal region, the lateral cephalometric view, cone beam computed tomography (CBCT), spiral tomography and the transymphyseal X-ray view.
An experimental water phantom was developed to reproduce human soft tissue around the mandible. Images were taken of four mandibles by the four X-ray techniques. Three different CBCT machines were included. The source of each image was disguised by displaying all images in the same format on the same computer screen. A protocol was developed to process the images for viewing whilst preserving their image quality. A panel of observers of ten dentists viewed the images and rated their image quality by recording their agreement with six statements on a five point Likert scale.
The results showed a statistically significant difference in image quality between imaging methods. There were clear differences in the ratings between the three cone beam computed tomography machines. Small volume, high resolution CBCT provided images with the highest scores for subjective image quality.
Within the limitations of this study, significant differences in subjective image quality were found between imaging systems used for cross sectional imaging for the symphyseal region of the mandible prior to dental implant placement.
为了安全地在该区域植入牙种植体，需要对下颌前骨的形态进行三维评估。本研究比较了四种颏部横断面成像方法（侧位头颅侧位片、锥形束 CT（CBCT）、螺旋 CT 和经颏部 X 线片）的主观图像质量。
研制了一个实验性的水模，以再现下颌周围的人体软组织。用四种 X 射线技术对四个下颌骨进行成像。包括三种不同的 CBCT 机。通过在同一台计算机屏幕上以相同的格式显示所有图像，掩盖了每个图像的来源。制定了一个方案来处理图像，同时保持其图像质量。由十名牙医组成的观察者小组观看了图像，并通过在五点李克特量表上记录他们对六个陈述的一致性来对图像质量进行评分。
结果显示，成像方法之间的图像质量存在统计学上的显著差异。三种锥形束 CT 机之间的评分差异明显。小体积、高分辨率 CBCT 提供的图像在主观图像质量方面得分最高。
在本研究的限制范围内，在植入牙种植体前颏部横断面成像中，用于该区域的成像系统的主观图像质量存在显著差异。
