da Silveira Heraldo Luis Dias, Silveira Heloisa Emilia Dias
Departamento de Cirurgia e Ortopedia, Universidade Federal do Rio Grande do Sul, 2492 Porto Alegre, Rio Grande do Sul, 90035-003 Brazil.
Angle Orthod. 2006 May;76(3):394-9. doi: 10.1043/0003-3219(2006)076[0394:ROCMMB]2.0.CO;2.
The purpose of this study was to assess reproducibility of cephalometric measurements in cephalograms obtained by three dentomaxillofacial radiology clinics. Forty lateral cephalometric radiographs were selected and sent at different times to three different clinics for cephalometric analyses. Each clinic digitized the radiographs with the same resolution, and landmarks were located with the mouse pointer directly on the digitized radiographic image on the screen. Three cephalograms were obtained from each radiograph, totaling 120 analyses. Data were analyzed with analysis of variance. Of the 32 factors studied, reproducibility of results was satisfactory for only four factors: position of maxilla relative to anterior cranial base, inclination of occlusal plane relative to anterior cranial base, position of lower incisor relative to nasion-pogonion line, and soft-tissue profile of face (P < .05). Differences in cephalometric measurements were present and such differences were significant for most factors analyzed. The different cephalometric measurements obtained by the three dental radiology clinics were not reproducible.
本研究的目的是评估由三家口腔颌面放射科诊所获取的头颅侧位片中头颅测量的可重复性。选取了40张头颅侧位片，并在不同时间发送至三家不同的诊所进行头颅测量分析。每家诊所均以相同分辨率对这些X光片进行数字化处理，并用鼠标指针直接在屏幕上的数字化X光图像上确定标志点。每张X光片获得三张头颅侧位片，共计120次分析。采用方差分析对数据进行分析。在所研究的32个因素中，只有四个因素的结果可重复性令人满意：上颌骨相对于前颅底的位置、咬合平面相对于前颅底的倾斜度、下切牙相对于鼻根点-颏前点连线的位置以及面部软组织轮廓（P < 0.05）。存在头颅测量差异，且对于大多数分析因素而言，这种差异具有显著性。三家口腔放射科诊所获得的不同头颅测量结果不可重复。
