In fact impression for models (Fig.3-7) is taken after UL caries control.   UR 5 has been extracted, while LR5 will be.  After LR6 DO composite, molar bands will be placed at LR6 (retention of composite),7.

Which Teeth to be Extracted Last Next

Xin Wei, DDS, PhD, MS 1st edition 08/22/2018, last revision 09/09/2018