OK. But on researching the cracked molar problem, the following 2 restoration methods were found. It was hoped that either might be able to work in this case.
A: Placing a orthodontic band around the tooth to hold it in place, followed by endodontic treatment to restore the core, followed by a crown to secure it biomechanically from the top. Hopefully advanced endodontic filler would fill, seal and cement the tooth together below the gumline securely. The teeth previously had braces and orthodontic bands before.
B: An alternative procedure was found where the tooth was carefully extracted, repaired externally from the body, and then replanted a few weeks later.