I had a wisdom tooth on the lower ride side extracted today - second molar? The first molar is a metal alloy crown fused to porcelain, which is around 5 years old and in perfect condition. The dentist described it as a difficult extraction. In the process he chipped the crown in two places (see pics) and knocked the crown off. He bonded it back on and said he would repair the exposed alloy using a composite resin next week,