In patients with a vertical growth pattern, how does the FMA angle change?

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Study for the Orthodontics 5th Year SC Exam. Engage with flashcards and multiple choice questions, each with detailed explanations. Prepare confidently for your future in orthodontics!

Multiple Choice

In patients with a vertical growth pattern, how does the FMA angle change?

Explanation:
In a vertical growth pattern, the mandible tends to rotate downward and backward as the face lengthens. This makes the mandibular plane steeper relative to the Frankfort horizontal, so the angle between these two reference lines—the FMA—becomes larger. Therefore, the FMA is increasing. Normal FMA is roughly in the mid-20s degrees; vertical growers typically show a higher angle, reflecting the taller lower face and steeper mandibular plane.

In a vertical growth pattern, the mandible tends to rotate downward and backward as the face lengthens. This makes the mandibular plane steeper relative to the Frankfort horizontal, so the angle between these two reference lines—the FMA—becomes larger. Therefore, the FMA is increasing. Normal FMA is roughly in the mid-20s degrees; vertical growers typically show a higher angle, reflecting the taller lower face and steeper mandibular plane.

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