Question 165 · LDEK · Crowns
The shoulder margin is:
- A. a straight margin at the angle of 90 degrees to the tooth wall.
- B. a obtuse margin at the angle of 120 degrees to the tooth wall.
- C. a modified margin with a bevel.
- D. a flanged margin in the shape of trough, that provides a larger adhesion surface.
- E. term used in the preparation without the margin.
Hint
The shoulder is the classic butt-joint finish line; consider the angle it forms with the axial wall.
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