Figure 1.
A sketch of Y-split recession, side view. (a) The first orientation point (“A”) is given by the middle of the natural muscle insertion. The second orientation point (“B”) is located 6 mm straight behind A. With a compass, the distance rA is marked with color on the globe. The same procedure is repeated from B, with the distance rB. The intersection of the two marked lines indicates the new insertion points for the split-muscle halves. (b) The “control distance” (“C”) ensures correct placement of the new insertion points.