is there any situation that a dentist can not reapply a cap that has come loose with permanent cement? I was told that due to a specific situation that showed up on an x-ray, that it was against the law to put he cap back on permanently. There is no pain at the site.
Thanks for your query, I have gone through your query. The ca or crown cannot be put if 60-70%of the tooth structure is lost. If the bone support is fine and tooth has 50% crown structure, then it can be fixed with a cap. Even if the cap has come with some tooth structure, we can try to save the tooth by doing a custom post with resin material.  Ethics or law says, we can try our best to save the natural tooth. I hope my answer will help you, take care.