1.  After temporary crown fabrication:

         After trimming the margin of the crown form aggressively.  Make sure that there is plenty clearance between just inserted abutment and the opposing arch.  Reline the crown form with acrylic of matching shade, trim the margin and polish.  Add acrylic to loose contact area if necessary.

When the provisional is seated the interdental papilla should be kept in its normal position.  Use an articulating paper to check that there is no contact when the patient bites down and grinds.  Direct vision should reveal that there is clearance between the temporary crown and the opposing occlusal cusp.

Remove the cord, finish temp bond cementation and remove excess cement thoroughly.

2. Why the crown is off?
 
- It's because the temporary crown didn't have enough needed space inbetween the temporary crown and the opposing tooth cusp when he bites down and grinds teeth.

Suniti....