首页> 外文期刊>International Journal of Dentistry >From 2D to 3D: Construction of a 3D Parametric Model for Detection of Dental Roots Shape and Position from a Panoramic Radiograph—A Preliminary Report
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From 2D to 3D: Construction of a 3D Parametric Model for Detection of Dental Roots Shape and Position from a Panoramic Radiograph—A Preliminary Report

机译:从2D到3D:构建用于从全景X射线照片检测牙根形状和位置的3D参数模型的初步报告

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Objectives. To build a 3D parametric model to detect shape and volume of dental roots, from a panoramic radiograph (PAN) of the patient.Materials and Methods. A PAN and a cone beam computed tomography (CBCT) of a patient were acquired. For each tooth, various parameters were considered (coronal and root lengths and widths): these were measured from the CBCT and from the PAN. Measures were compared to evaluate the accuracy level of PAN measurements. By using a CAD software, parametric models of an incisor and of a molar were constructed employing B-spline curves and free-form surfaces. PAN measures of teeth 2.1 and 3.6 were assigned to the parametric models; the same two teeth were segmented from CBCT. The two models were superimposed to assess the accuracy of the parametric model.Results. PAN measures resulted to be accurate and comparable with all other measurements. From model superimposition the maximum error resulted was 1.1 mm on the incisor crown and 2 mm on the molar furcation.Conclusion. This study shows that it is possible to build a 3D parametric model starting from 2D information with a clinically valid accuracy level. This can ultimately lead to a crown-root movement simulation.
机译:目标。从患者的全景X射线照片(PAN)建立3D参数模型以检测牙根的形状和体积。材料和方法。获得了患者的PAN和锥束计算机断层扫描(CBCT)。对于每颗牙齿,都考虑了各种参数(冠状和根部的长度和宽度):这些参数是通过CBCT和PAN测量的。比较测量值以评估PAN测量的准确性水平。通过使用CAD软件,使用B样条曲线和自由形式的曲面构建了门牙和磨牙的参数模型。将牙齿2.1和3.6的PAN测量值分配给参数模型;从CBCT中分割出相同的两颗牙齿。叠加两个模型以评估参数模型的准确性。 PAN测量结果是准确的,可以与所有其他测量结果相比较。通过模型叠加,最大的误差在门牙冠上为1.1 mm,在磨牙分叉处为2 mm。这项研究表明,可以从具有临床有效准确性水平的2D信息开始构建3D参数模型。这最终可以导致冠根运动模拟。

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