Which of the following facial landmark planes must be positioned slightly (5 degrees) down toward the floor when positioning the arches within the focal trough?
A) Frankfort
B) Ala-tragus
C) Midsagittal
D) Occlusal
B
Explanation: A) The Frankfort and occlusal planes should be positioned parallel to the floor. The midsagittal plane should be positioned perpendicular to the floor.
B) The Frankfort and occlusal planes should be positioned parallel to the floor. The midsagittal plane should be positioned perpendicular to the floor.
C) The Frankfort and occlusal planes should be positioned parallel to the floor. The midsagittal plane should be positioned perpendicular to the floor.
D) The Frankfort and occlusal planes should be positioned parallel to the floor. The midsagittal plane should be positioned perpendicular to the floor.
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