Hello, I am not a lab professional but came across this forum and I'd like to ask a question from you, the pro guys. I have a front tooth (21) which has discoloured after an accident about 15 years ago. It has been root treated and filled (no post). It's considerably darker than other teeth (due to damage from the same accident I will have all 4 incisors porcelained due to chipping, etc - they have a composite currently on). My dentist plans to put a post in 21 and then a porcelain crown - not decided yet whether a zirconia or emax (or a different combination is the way to go). My questions: 1.what material would you recommend for the post/crown which will be placed (tooth 21, considerably dark discoloration; bare in mind issues with transculscency / opacity). - Also keep in mind the neighbouring 11, 22 and 12 will have crowns/veneers but they are not discoloured. 2. what are the issues/benefits with zirconia vs. emax? (besides strength, etc). When would you use all porcelain press, layering, etc? Thank you very much for your thoughts/answers/opinions/recommendations.