# The amount of reduction required for a tooth for all metal crown restoration is:
a) So that there is proper clearance between the teeth
b) So that the tooth architecture interferes with the arch of rotation
c) So that the tooth architecture doesn't interfere with the arch of rotation
d) At least 2mm on all the surfaces
The correct answer is: B. So that the tooth architecture interferes with the arch of rotation
The longer the occlusogingival length of the preparation, the greater is the retention. This is because longer preparations interfere with the arc of the casting pivoting about a point than shorter preparations.
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