I think the dental impression was faulty, so the crown was too tight and it broke due to stress. They use a very brittle material now, that is extremely hard but also can't tolerate much strain. They insisted that it was the lab's fault and used the same impression the second time with the same exact result. They were going to use the same impression the third time, but I insisted they make a new one. It's annoying because I can't chew on the temporary crown with anything sticky that might pull it off and I can't floss on that tooth.