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The following are true of a knife-edged margin EXCEPT a. May be used in teeth with very convex axial surfaces b. Can be used in the lingual surfaces of mandibular posterior teeth c. Can be used to prepare
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The following are true of a knife-edged margin EXCEPT a. May be used in teeth with very convex axial surfaces b. Can be used in the lingual surfaces of mandibular posterior teeth c. Can be used to prepare an abutment tooth that is tilted d. May be used in preparing for a PFM crown on a very short tooth

User AliKarimi
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Answer:

I believe the one that isnot true is D, because in order to preserve a periodontium, this means crown lengthening, not very short tooth.

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User Mkabatek
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