In deep occlusion, the FMA angle tends to do what?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $9.99Unlock all

Prepare for the Orthodontics 5th Year SC Exam with comprehensive flashcards and multiple-choice questions. Each question offers insightful hints and explanations to optimize your practice and enhance your readiness for the exam!

Multiple Choice

In deep occlusion, the FMA angle tends to do what?

Explanation:
In deep occlusion, the vertical dimension is reduced and the jaw sits more horizontally relative to the cranial base. The FMA is the angle between the Frankfort horizontal plane and the mandibular plane; when the mandible and its plane become less steep compared with Frankfort, this angle gets smaller. So the FMA tends to decrease in deep bite cases, reflecting a flatter mandibular plane in a brachyfacial pattern. If the pattern were open bite or a long-face type, you’d expect the FMA to be larger.

In deep occlusion, the vertical dimension is reduced and the jaw sits more horizontally relative to the cranial base. The FMA is the angle between the Frankfort horizontal plane and the mandibular plane; when the mandible and its plane become less steep compared with Frankfort, this angle gets smaller. So the FMA tends to decrease in deep bite cases, reflecting a flatter mandibular plane in a brachyfacial pattern. If the pattern were open bite or a long-face type, you’d expect the FMA to be larger.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy