hello and welcome,
sensitivity is a common finding in case of toothpreparation for crown cutting.
this due to exposed dentin
and dentinal tubules which are closely situated to vital pulp tissue of teeth.
usually sensitivity lasts when crown has placed.
but in your case,the tooth preparation has done involving more tooth structure.
desensitising agents can be used to reduce sensitivity.
if the sensitivity persists,root canal treatment
of the tooth and then crown preparation has to be done.
also get scaling done.
get your dentist's opinion regarding this.
use desensitising toothpaste like sensodent to brush your teeth.