You have to get the crown replaced as soon as possible to prevent further damage.
Your dentist will remove the left over crown using a crown remover and measurement is taken. It will be sent to the dental lab and crown is fixed in the subsequent visit.
Next Steps
Visit your dentist.
Health Tips
Crowns, especially all-porcelain ones, can chip. This can sometimes be repaired in the mouth. Your dentist will etch the porcelain with a special agent and then bond a composite resin to it to fix the chip. Porcelain repairs often don't last long.