This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Which type of cervical finish line prepared will result in 
an overcontoured restoration? 
Select and explain. 
A. Chamfer, B. Knife-edge, C. Shoulder, D. Shoulder with bevel
B: Knife-edge
Answer: B: Knife-edge 
Explanation: Knife-edge margin provides inadequate bulk for the material and underpreparation. Overcontoured crowns result mainly due to underprepared teeth.