Is This a Good Crown?

[joey]

My dentist put an all porcelain crown on my right front tooth #8.
The process took many months, including three different temporary crowns. When I floss I notice a defect or something near the gum line on the side of the crown nearest to #9 tooth.
the x-ray of the tooth is unlike any of my other dental x-rays. There appears to be a defect or something at the gum line across from tooth #9
Looking forward to your comments.

 

[Dr M]

Good day

It looks there is an air bubble in the porcelain itself, and if there might be inadequate seal of the margins of the crown. This could be as a result of impressions or scans not done properly or contacts between teeth not checked prior to seating, resulting in slightly open margins, which might lead to micro-leakage.