This document provides instructions for constructing the Goal Anterior Limit Line (GALL) on a cephalometric tracing based on forehead shape and inclination. It involves: 1) Marking the FA point of the forehead and upper central incisor. 2) Drawing the Forehead Anterior Limit Line (FALL) between these points. 3) Measuring forehead inclination and using a calculation to determine how many millimeters anterior the GALL should be relative to the FALL, based on the forehead inclination.

1. How to construct the
Goal Anterior Limit Line
(GALL)

2. forehead shapes
straight angular round
trichion/superion
glabella
FA point
trichion
superion
FA point
glabella
glabella
FA point
superion
trichion

3. 1 judged -2 mm to
FA point of the
forehead
1. Place patient in an upright head position.
2. Select the FA point of the forehead
(midway between trichion/superion and
glabella).
3. Judge how far the FA point of the upper
central incisor is: even with (0), anterior
to (+), or posterior to (-) the FA point of
the forehead.

4. 19 -7 = 12 x .6 = 7.2mm
1 is -2 mm to FA point of the
forehead
FALL GALL
1. On a cephalometric tracing, mark a point
(inferion) near the upper central incisor
to indicate whether the FA point of the
incisor is: even with (0), anterior to (+),
or posterior (-) the FA point of the
forehead.
2. Draw a line (FALL) from the FA point of
the forehead to inferion. Draw a line
from superion to glabella.
3. Measure the forehead inclination.
4. Subtract 7 from the forehead
inclination.
5. Multiply this number by .6 mm.
6. For every degree greater than 7 , the
GALL is .6 mm more anterior than the
FALL. For a forehead inclination of 0 or
less, the GALL is the same as the FALL.
7. Draw the GALL parallel to the FALL, but
not beyond glabella.