Effect of head positioning in panoramic radiography on vertical measurements: An in vitro study
Effect of head positioning in panoramic radiography on vertical measurements: An in vitro study
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DOI：
10.1259/dmfr.25.2.9446974
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发表时间：
1996-04-01
影响因子：
3.3
通讯作者：
Ainamo, A
中科院分区：
文献类型：
--
作者：
Xie, Q;Soikkonen, K;Ainamo, A
目标。评估是否有可能通过全景x线片对颌骨进行精确的垂直测量。5个干颅骨前后移动5mm，矢状面上下倾斜5度。在九个不同的位置获得每个头骨的全景x线片。在上颌骨，使用三条基准线，在第一前磨牙和第一磨牙的远端表面和中线处进行垂直测量。在下颌骨，测量了第一前磨牙和第一磨牙的远端表面，以及两侧的颏孔和中线。人工标记点和线，并对x线片进行数字化、放大和测量。矢状面移动和倾斜对下颌骨的测量只有轻微的影响。头部矢状面倾斜对关节突至牙槽嵴之间的所有测量值以及上颌中线的测量值影响最大。关节突之间的线不适合作为测量含牙区域的参考线。如果参考线与牙齿在同一垂直平面上，头部的轻微错位不会显著影响下颌骨或后上颌的垂直测量。
Objective. To assess whether it is possible to make accurate vertical measurements of the jaws from panoramic radiographs.Methods. Five dry skulls were shifted 5 mm forwards and backwards and tilted 5 degrees up and down in the sagittal plane. Panoramic radiographs of each skull were obtained in nine different positions. In the maxilla, three reference lines were used and vertical measurements were made at the distal surfaces of the first premolar and first molar and in the midline. In the mandible, measurements were made at the distal surfaces of the first premolar and first molar, and at the mental foramen on both sides, and in the midline. The points and lines were marked manually and the radiographs were digitized, magnified and measured.Results. Sagittal shifting and tilting had only a slight effect on measurements in the mandible. Sagittal tilting of the head had the greatest effect on all the measurements made from the line between the articular eminences to the alveolar crest, as well as measurements in the maxillary midline.Conclusions. The line between the articular eminences is unsuitable as a reference line for measurements of the tooth-bearing areas. A slight misalignment of the head does not significantly affect the vertical measurements in the mandible or of the posterior maxilla if the reference lines are in the same vertical plane as the teeth.