Is it normal for a brand new crown (not yet attached to tooth) to break when asked to bite down on it?

I had a root canal on a molar done by specialist. Then my dentist prepared the tooth for a crown. When he put the crown on the tooth and told me to bite down hard... I did....when he asked me to bite down hard a second time, the new crown broke in half. Is this normal? How can it last if it is so easily broken? Is my dentist doing so getting wrong?

Doctor Answers 1

New Crown Breaking

Was the crown a permanent crown or a temporary crown?

Temporary crowns are acrylic, if it is to thin, can crack easily.  

If the crown is a permanent crown, cracking of the porcelain is not normal during insertion.  However, certain factors could have caused the crown porcelain to crack:

1.  Imperfection or impurity in the porcelain which caused a weak area.  

2.  Inadequate reduction of tooth resulting in a thin area of porcelain and weak spot.  If this is the cause your dentist must reprep the tooth to provide adequate room and thickness of porcelain.  

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