Can a dental assistant place my permanent crown?

I agree with Dr Sprague. The darkening of an endodontically treated tooth must be masked before cementing a crown. That can mean an opaque crown that doesnt have translucency or an opaque layer applied to the tooth before cementing the crown. 

Unfortunately, the only real option is a new crown, but the shade underneath of the remaining tooth ("stump") shade and choice of material is most important to mask the darkness and be able to match the adjacent teeth.

Be aware that a perfect match today will not be a perfect match in 5 years, 10 years etc.  Teeth change in size and shape overtime. While the ceramics we are using today to make crowns will wear over time, it is much less that enamel and they will not change color at all. Before you...

People often do not look at specific areas of their body until something is wrong or after they've had something treated there. That being said, the body's sides are not mirror images. Each side has varying anatomy, shape, color etc. Your regular dentist is the best person to evaluate...

My question is did this occur during the temporary phase? If it occurred right after the crown was placed then most likely the contact between the teeth is the problem. The space that you show in your picture is normal when gum recession has taken place. Closing that space is not possible with a...

The temporary crown will stay whatever color it was during the crown preparation phase. Not to worry though. The laboratory along with your dentist has the skill to match the porcelain on your permanent crown to your natural dentition