Is it normal for gums to be sore and tender after placement of crown over implant?

I think if you make them fused together , you will have more strength, and if you make them screw retained would help,that way you can have a good service every time you require,the doctor will remove the screw and remove crowns give service and will set them in again. I hope this helps.

To soon to know yet how you will look.  Give yourself some time to heal and then become more aggressive with rushing.Sometimes it is necessary to reduce the underlying bone (not sure if you had this) to give long term results.It is also possible to improve gummy smile by a reverse...

It sounds like you have a Porcelian Fused to Metal crown on the tooth and the gum receded leaving the gray area.  The best solution would be to have the crown replaced with an all porcelain crown to precent the dark gray area from being visible.  Talk to a local dentist about your options