Which of the following cephalometric values should decrease for an individual between the ages of 8 and 18 years?

 # Which of the following cephalometric values should decrease for an individual between the ages of 8 and 18 years?

A. FMA

B. ANB

C. GoGn-SN

D. All of the above

The correct answer is D. All of the above. 

With the possible exception of those who have an openbite malocclusion, patients who have a Frankfort mandibular angle (FMA) within the normal range can generally be expected to show a reduction in this angle with continued growth. If, during orthodontic treatment, the FMA increases, then it may be expected to return to its former relationship, or less, if the patient continues to grow. If no further growth takes place, then the return to the original FMA will likely not occur. If, however, further growth occurs and the maxillary and mandibular teeth are retained in a position of minimal overbite, then the subsequent increase in posterior facial height and a leveling of the FMA may occur without an accompanying increase or relapse in the deep overbite.

The magnitude of the ANB angle, however, is influenced by two factors other than the anteroposterior difference in jaw position. One is the vertical height of the face and the second is that if the anteroposterior position of nasion. During growth, as the vertical height of face occurs, ANB angle decreases generally.

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