Which value describes the SNB angle in mandibular prognathism?

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Prepare for the Orthodontics 5th Year SC Exam. Use flashcards, multiple choice questions, and detailed explanations for each question. Increase your confidence and readiness for the test with targeted study tools and resources!

Multiple Choice

Which value describes the SNB angle in mandibular prognathism?

Explanation:
SNB angle shows how far forward the mandible sits relative to the cranial base. When the mandible is prognathic, it projects forward, increasing the SNB angle beyond the normal range. The normal SNB is about 80 degrees (roughly 78–82°, depending on population). So a prognathic mandible would have an SNB value greater than this normal range. Values around 80° are near average, while 78° is below average. Therefore, the description that fits mandibular prognathism is more than normal.

SNB angle shows how far forward the mandible sits relative to the cranial base. When the mandible is prognathic, it projects forward, increasing the SNB angle beyond the normal range. The normal SNB is about 80 degrees (roughly 78–82°, depending on population). So a prognathic mandible would have an SNB value greater than this normal range. Values around 80° are near average, while 78° is below average. Therefore, the description that fits mandibular prognathism is more than normal.

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