A 23 year old male patient complains that his face appears too long. Extra-oral examination reveals a retrognathic mandible, steep mandibular plane angle and a prominent antegonial notch. Which of the following statements regarding this patient's condition is false?: (A) Growth of mandible is more posteriorly, (B) Growth of mandible is more anteriorly, (C) Rotation is backward, (D) Rotation can be given a positive sign
Answer is A. By convention, the rotation of either jaw is considered "forward" and given a negative sign if there is more growth posteriorly than anteriorly. The rotation is "backward" and given a positive direction if it lengthens, anterior dimensions more than posterior ones, bringing the chin downward and backward.
Contemporary orthodontics, William Proffit, 4th edition page 116