Vertical growth of the face
As an experienced OMFT speech therapist you will work a lot with trainers / myobraces. You prefer to start with this at a young age in order to influence the growth and direction of the jaws towards a good growth direction. Open bites will close and very often a neat Angle class I will arise.
Lower indicator line eand measuring the angle of mandible
To determine whether the direction of growth of the jaws in a client is good, you must determine the upper and lower indicator line at different times during therapy. This is easiest with a digital caliper. You will see that with a vertical growth, the angle of the mandible also increases. You can easily determine this with the measurer of the angle of mandible.