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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
if the reason your gum has receded is because there is decay around the margin of the crown, you need to have the crown replaced. if it is a gum issue and there is no decay, just recession around an otherwise healthy alive tooth, you maybe able to have a gum-graft to replace the lost soft tissue/gum.
New advances in porcelain crowns can allow for thin but strong material on the lingual (zirconia) and esthetic ceramic on the facial (labial). Lithium dislocate crowns may also work well here. Newer cements also have an inherent bond to tooth structure. Make sure you see a dentist who is...
The three porcelain systems you mentioned differ in chemical composition. Procera, the oldest is, is aluminum oxide with conventional feldspathic porcelain fired over the alu-oxide core. It is indicated in single tooth applications only and has largely been replaced by Emax which is lithium...
Yes, it is possible to drill through an EMAX crown. need a special bur ideally an an adept clinician with good skills. There is always the risk of weakening the porcelain and possible fracture, but that is pretty rare.
