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R

Radiolucent

Penetrable for Xrays; gives black image on a radiograph

 

 


Radiopaque

Non-penetrable for Xrays; gives white image on a radiograph

 

 


Remineralization

Incorporation of lost mineral parts into the dental tissue

 

 


Replacement tooth


Retained roots


Rubber dam

A latex sheet used to isolate the tooth during its preparation