Fig.1: Mr. Xia (78 years old) has several old dentures (O).  One of the denture (fake) teeth is broken (^, upper right lateral incisor) at the same place of every one of his old dentures.  The denture in the middle was used to take impression to be sent to the lab for repair (R, with addition of a new false tooth ^) and duplication for a new denture (D). 

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Xin Wei, DDS, PhD, MS 1st edition 07/09/2013, last revision 07/09/2013