Is there a glue/cement that will bond a permanent retainer to my top teeth? They have two crowns.

I'm 42 and just had my braces removed after 2.5 years. I had thought I was going to be getting a permanent retainer top and bottom but when the time came, my Orthodontist said he cannot attach a permanent retainer to my top because I have 2 crowns and there isn't a glue that will bond the crown to the permanent retainer. I guess I'm finding it hard to believe that there isn't a single glue to make this happen. I am having problems getting use to the temp. retainer. Gagging etc.

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