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

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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

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.

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