Crown lengthening, build-up. can i get a temporary crown on the same day ?

Possibly: That is possible, but it is up to you and your dentist to decide if it is the right thing to do in your case. Bring it up before the crown lengthening and build up are done.

Usually: Hard to tell without looking but it's pretty routine to have them done at the same time.

Yes: A doctor usually does ceon lengthening if there is not enough tooth structure for a crown patient are dismissed with temporary crown and after few weeks, they come back for a final prep and impression.

Prep: It is generally better to have the final impression done for your definitive crown after some healing... Make sure the crown lengthening procedure involves bone surgery, not just removal of gum tissue, and ask about biologic width to your dentist.