I'm 62 and have had gold crowns over the years. I just had a porcelain crown (my first) installed on an upper molar and with the crown just sitting in place, I was told I needed an xray to see if everything "seated" properly before glueing. I've made an effort all my life to limit dental xrays if not completely necessary. I've never had an xray to permanently glue a crown in place but I reluctantly agreed. Is this normally done now? They said they "always do that" - however a porcelain molar crown my husband got from them about 4-5 years ago, they didn't do a 'placement' xray. When I asked about that, they replied "well, someone must have forgotten to do it".