My crown is still rough after dentist smoothening it, it kind of irritates my tongue. What should I do?

Essentially they are the same, except the 3/4 crowns wrap around the sides of the teeth to give a little more grab on them and it may also help with the change in color. In your case, it would seem that the 3/4 crowns would be the best

I'm not sure what the purpose of recommending 3/4 crowns is. There seems to be several issues that need to be addressed first before decoding on a course of treatment involving crowns. Number one would be to find out what is causing the exteme sensitivity and pain....are they abscessed and need...

I would recommend discussing this with your dentist.  Cerec crowns can be made of many materials.  If they were done many years ago some of the stronger materials that we use today may not have been available.  I tell my patients that the only unbreakable crown is full gold....

Probably longer than the temporary crown. See your dentist when you are ready to do a permanent crown.

If there is enough remaining tooth structure(ie, not off at the gum line), then1) could place pins and a buildup2) could place a prefebicated post and build up3) if less tooth, could do a cast post core then all of these would require a new crown on top.If this is a molar that will take a lot of...

The fact that you are not in any pain is a good thing.  I would still call your provider's office and leave a message.  They should call you back.  Your doctor will know based on your case whether you can wait until Monday or not.