I broke my porcelain crown on front tooth. i want to know that when i will again place a new crown, my tooth structure will again be remove?

Unfortunately yes: There are rare times when an existing crown is removed an some refinement is not needed. Lumineers can placed over existing crowns as long as there is no decay under the crown. In this case no actual tooth structure would have to be removed.

Broken Porcelain. : They answer to your question may depend on what material you use to replace the broken crown? The real question is why did my crown break? There are many things that can break a crown for example: grinding your teeth, a bad bite, trauma, and possibly not enough reduction of tooth structure. I would discuss these issues with your dentist to find the right material. The simple answer is yes.

Yes and no: Yes, if removal of crown reveals recurrent decay which will be needs to removed prior to replacing yourcrown. If no recurrent decay is evident, then you can repair the crown with composite bonding, or replace with new crown being careful to avoid damaging the underlying prepped structure. In either situation. Tooth structure should not have to be removed, unless tooth prep is incorrect.