Morphological structure of the infraorbital canal using three-dimensional reconstruction.

Our study aim was to evaluate the initial position accurately and the direction of infraorbital canal approximately by analyzing the parameters of infraorbital canal. This study was based on 64-slice computed tomographic multiple planar reconstruction technique and can improve the success rate of infraorbital nerve blockade. The following observations and measurements were carried out in 224 normal infraorbital canals (112 people): the length, angle, and adjoined relations of initial infraorbital canal, to reveal the anatomic characteristics of the canals and to compare the difference between left and right or male and female. Six indicators were measured: (1) the length of initial infraorbital canal; (2) the distance between skin and the first obvious turn of infraorbital canal along the direction of initial infraorbital canal (the depth of puncture); (3) the vertical distance between infraorbital canal and nasal septum; (4) the vertical distance between infraorbital canal and infraorbital rim; (5) the angle between the infraorbital canal and the Frankfort plane; and (6) the angle between the infraorbital canal and the sagittal plane. The difference was statistically significant between 2 sides on the depth of puncture. For other values, the differences between left and right and between women and men were of no statistical significance.