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cerec obviate need for crown lengthening?

My dentist tells me that i need a crown.  The tooth is worn down (due to grinding i think) and there is not much for the crown to  hold onto.  She proposes crown lengthening, removing some of the bone etc.  I wonder if an onlay might be an alternative.  The issue must be whether there is enough for the onlay to hold onto.  Is less of a problem with a cerec onlay?
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thanks.  what would a prosthodontist do?

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COMMUNITY LEADER
crown lenthening procedure does'nt  help much for an extremely short molar crown.  Seeing a prosthodontist for a complicated restoration is advised.
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