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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 It is indicated in single tooth applications only and has largely been replaced by Emax which is lithium...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.
