What is the mandibular plane angle range?

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Multiple Choice

What is the mandibular plane angle range?

The mandibular plane angle measures how steep the lower border of the mandible sits relative to the cranial base, typically the angle between the mandibular plane (gonion to gnathion) and the Frankfort horizontal plane. It reflects vertical facial growth: a mid‑20s angle corresponds to a balanced, average growth pattern. The standard normal range used in many exams is about 24 to 26 degrees, making that range the best representation of typical adult anatomy. A smaller angle, around 20 degrees, suggests a flatter mandible with a more horizontal growth pattern, while a larger angle, around 28 to 30 degrees, indicates a steeper mandible and greater vertical facial height. Those other ranges fall outside the common normative window, which is why the 24–26 degree range is the best answer.

The mandibular plane angle measures how steep the lower border of the mandible sits relative to the cranial base, typically the angle between the mandibular plane (gonion to gnathion) and the Frankfort horizontal plane. It reflects vertical facial growth: a mid‑20s angle corresponds to a balanced, average growth pattern. The standard normal range used in many exams is about 24 to 26 degrees, making that range the best representation of typical adult anatomy. A smaller angle, around 20 degrees, suggests a flatter mandible with a more horizontal growth pattern, while a larger angle, around 28 to 30 degrees, indicates a steeper mandible and greater vertical facial height. Those other ranges fall outside the common normative window, which is why the 24–26 degree range is the best answer.

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