Yes, for stainless steel and pre-veneered (NuSmile Signature) crowns you would use the crown to test the fit. If the crown is contaminated with blood or saliva it should be simply water rinsed and air dried before cementation. For zirconia (NuSmile ZR) crowns scientific studies have shown that it is very important that saliva or blood does not contaminate the internal surface of the crown. For this reason, it is recommended to use NuSmile Try-In crowns during trial fitting to avoid saliva or blood contamination of the actual NuSmile ZR crown being used. The NuSmile Try-In crowns are precision manufactured to be identical in size and shape to NuSmile ZR crowns and can be used and then autoclaved for reuse. If using zirconia crowns where Try-In crowns are not available, such that contamination of the internal zirconia surface does occur, one of two processes should be undertaken; either clean the inner surface of crown with Ivoclean according to manufacturer’s instructions prior to cementation (Mfgr: Ivoclar Vivadent;www.ivoclarvivadent.com), or sandblast the inside of the crown with pure aluminum oxide.