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首页> 外文期刊>American Journal of Orthodontics and Dentofacial Orthopedics >Factors affecting the accuracy of buccal alveolar bone height measurements from cone-beam computed tomography images
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Factors affecting the accuracy of buccal alveolar bone height measurements from cone-beam computed tomography images

机译：影响锥束计算机断层扫描图像的颊齿槽骨高度测量准确性的因素

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Introduction: The reasons for inaccuracies in alveolar bone measurement from cone-beam computed tomography (CBCT) images might be multifactorial. In this study, we investigated the impact of software, the presence or absence of soft tissues, the voxel size of the scan, and the regions in the jaws on buccal alveolar bone height measurements in pigs at an age equivalent to human adolescents. Methods: Marker holes, apical to the maxillary and mandibular molar roots, and mesiodistal molar occlusal reference grooves were created in 6 fresh pig heads (12 for each jaw), followed by CBCT scans at 0.4-mm and 0.2-mm voxel sizes under soft-tissue presence and soft-tissue absence conditions. Subsequently, buccolingual sections bisecting the marker holes were cut, from which the physical alveolar bone height and thickness were measured. One blinded rater, using Dolphin (version 11.5 Premium; Dolphin Imaging, Chatsworth, Calif) and OsiriX (version 3.9; www.osirix-viewer.com) software, independently collected alveolar bone height measurements from the CBCT images. Differences between the CBCT and the physical measurements were calculated. The mean differences and the limit of agreement (LOA, ±1.96 SD) for every jaw, voxel-size, soft-tissue, and software condition were depicted. Each measurement was then assessed for clinical inaccuracy by using 2 levels of criteria (absolute differences between CBCT and physical measurements ≥1 mm, or absolute differences between CBCT and physical measurements ≥0.5 mm), and the interactions between soft-tissue and voxel-size factors for every jaw and software condition were assessed by chi-square tests. Results: Overall, the mean differences between the CBCT and the physical measurements for every jaw, voxel-size, soft-tissue, and software condition were near 0. With all other conditions kept equal, the accuracy of the maxillary CBCT measurements was inferior (larger limit of agreement ranges and higher frequencies of clinical inaccuracy) to the mandibular measurements. The physical thickness of the maxillary alveolar crestal bone was less than 1 mm and significantly thinner than the mandibular counterparts. For every jaw and software condition, the accuracy of measurements from the 0.2-mm soft-tissue presence CBCT images was consistently superior (smaller limit of agreement ranges and lower frequencies of clinical inaccuracy) to those from the 0.4-mm soft-tissue presence, the 0.4-mm soft-tissue absence, and the 0.2-mm soft-tissue absence images; all showed similar accuracies. Qualitatively, the soft-tissue absence images demonstrated much brighter enamel and alveolar bone surface contours than did the soft-tissue presence images. Conclusions: At an adolescent age, the buccal alveolar bone height measured from the maxillary molar region based on 0.4-mm voxel-size CBCT images can have relatively large and frequently inaccurate measurements, possibly due to its thinness. By using 0.2-mm voxel-size scans, measurement accuracy might be improved, but only when the overlying facial and gingival tissues are kept intact.
机译：简介：锥束计算机断层扫描（CBCT）图像中牙槽骨测量不准确的原因可能是多因素的。在这项研究中，我们调查了在与人成年年龄相同的年龄下，软件对猪的颊齿槽骨高测量的影响，软组织的存在与否，扫描的体素大小以及颌骨区域。方法：在6个新鲜的猪头（每个下颌12个）上创建标记孔，垂直于上颌和下颌磨牙根，并形成近中颌磨牙咬合参考沟，然后在0.4mm和0.2mm体素大小下在柔和的条件下进行CBCT扫描-组织存在和软组织缺乏条件。随后，切开将标记孔一分为二的颊舌切面，从其测量牙槽骨的物理高度和厚度。一个不知情的评分者，使用Dolphin（11.5版高级版; Dolphin Imaging，Chatsworth，CA）和OsiriX（3.9版; www.osirix-viewer.com）软件，从CBCT图像中独立收集了牙槽骨高度测量值。计算出CBCT与物理测量值之间的差异。描述了每个颚，体素大小，软组织和软件状况的平均差异和一致性极限（LOA，±1.96 SD）。然后，使用2个级别的标准（CBCT与物理测量值之间的绝对差值≥1mm，或CBCT与物理测量值之间的绝对值差≥0.5mm）以及软组织与体素大小之间的相互作用，评估每种测量值的临床准确性每个卡爪和软件状况的影响因素均通过卡方检验进行了评估。结果：总体而言，每个下颌，体素大小，软组织和软件状况的CBCT与物理测量值之间的平均差接近于0。在所有其他状况保持相同的情况下，上颌CBCT测量的准确性较差（下颌骨测量的一致性范围更大，临床不准确的频率更高。上颌牙槽cre骨的物理厚度小于1毫米，并且比下颌对应物明显薄。对于每种颌骨和软件状况，从0.2毫米软组织存在的CBCT图像测量的准确性始终优于（从协议范围的较小界限和较低的临床不准确率）到0.4毫米软组织存在的测量精度， 0.4毫米的软组织缺失图像和0.2毫米的软组织缺失图像;都显示出相似的准确性。定性地，与软组织存在图像相比，软组织缺失图像显示出更亮的牙釉质和牙槽骨表面轮廓。结论：在青春期，基于0.4毫米体素大小的CBCT图像从上颌磨牙区域测量的颊齿槽骨高度可能相对较大且测量结果经常不准确，这可能是由于其厚度薄造成的。通过使用0.2毫米体素大小的扫描，可能会提高测量精度，但前提是必须保持上面的面部和齿龈组织完好无损。

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