Sarnat B G, Selman A J
Acta Anat (Basel). 1978;101(3):193-201.
Two radiopaque implants were inserted into each left and right nasal bone in 5 female rabbits. Ventrodorsal cephalometric radiographs were then taken in a specially designed head-holder at 6 and 16 weeks of age. From these radiographs separate tracings were made on matte acetate paper of the left and right nasal bone regions including the radiopaque implants. Since the implants maintained the same relationship to each other in each nasal bone, they served as stable reference sites. The markers of the 16-week tracing were superposed on the markers of the 6-week tracing. The difference in the two established outlines represented the changes in size and shape in two dimensions that had occurred during the 10-week period. Our purpose was to determine the relative growth activity at several borders. The mean increase was 6.79 mm at the proximal (posterior) border, 6.19 mm at the distal (anterior) border, 2.73 mm at the lateral border, 1.22 mm at the medial border. Thus, growth at the proximal and the distal borders was about the same and about twice that of the lateral border and about 5 times that of the medial border.
在5只雌性兔子的左右鼻骨中各植入两个不透射线的植入物。然后在6周龄和16周龄时，将兔子置于专门设计的头托中拍摄腹背位头颅X线片。从这些X线片中，在磨砂醋酸纸上分别描绘出左右鼻骨区域，包括不透射线的植入物。由于植入物在每个鼻骨中相互之间保持相同的关系，它们作为稳定的参考点。将16周描绘的标记叠加在6周描绘的标记上。两个既定轮廓的差异代表了在10周期间二维尺寸和形状的变化。我们的目的是确定几个边界处的相对生长活性。近端（后部）边界平均增加6.79毫米，远端（前部）边界平均增加6.19毫米，外侧边界平均增加2.73毫米，内侧边界平均增加1.22毫米。因此，近端和远端边界的生长大致相同，约为外侧边界的两倍，约为内侧边界的5倍。
