In prognathism of the lower jaw, which statement about the SNB angle is true?

Prepare for the Orthodontics 5th Year SC Exam with comprehensive flashcards and multiple-choice questions. Each question offers detailed hints and explanations to ensure you're ready for test day!

Multiple Choice

In prognathism of the lower jaw, which statement about the SNB angle is true?

Explanation:
The SNB angle tells us how far forward the mandible sits relative to the cranial base. A larger SNB means the mandible is more prognathic. Normal SNB values are around 78–80 degrees, so when the mandible projects forward as in prognathism, the SNB increases beyond that normal range. Therefore, the correct statement is that SNB is more than normal. This increase helps distinguish a skeletal Class III pattern due to mandibular prognathism from other jaw relationships.

The SNB angle tells us how far forward the mandible sits relative to the cranial base. A larger SNB means the mandible is more prognathic. Normal SNB values are around 78–80 degrees, so when the mandible projects forward as in prognathism, the SNB increases beyond that normal range. Therefore, the correct statement is that SNB is more than normal. This increase helps distinguish a skeletal Class III pattern due to mandibular prognathism from other jaw relationships.

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