# Intracoronal retainer placed in the abutment tooth has the following disadvantage:
A. It is unaesthetic
B. They cannot provide support and stability
C. Difficult laboratory procedures
D. Difficult to repair and replace
The advantages of internal or precision attachments are improved esthetics by elimination of a visible retentive component and vertical support. Its disadvantages are difficulty in repair and replacing, greater cost to the patient and inability to use in teeth having short clinical crowns and tissue supported distal extension denture bases.
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