The dissected sides of the flap are held up by an assistant while the operator proceeds to chisel a thin bony plate from the frontal. The bony plate ends just above the root of the nose.
The dissection is now carried on downward until the bones proper of the nose appear, and latterly, so that the saw does not injure the soft parts, and to act as a guide for the course of the latter.
The position of the flap and the saw in position is shown in [Fig. 409].
Fig. 408.—First step.
Fig. 409.—Making lower nasal flap section.
Nélaton Method.
The saw is made to sever the nasal bones from the apophyses of the superior maxillary. The blade follows a line starting one centimeter anterior to the anterior and superior nasal spine, and is directed downward toward the second molar, not going entirely through the apophyses.
The latter are broken with the chisel in such way that some of the bony border lies in contact with the nasal process of the superior maxillary.