I did find this
As a dentist in the US, superglue will kill the nerve in your tooth over time, causing a root canal to be needed. If the tooth already has a root canal, it may not cause nerve damage to the tooth, but if it runs onto the gums, it can damage the blood supply to the gum tissue. The gums are a mucosal tissue, much different than putting on your skin. It has more nerves and blood supply. Also, most likely you would be sealing up tooth decay under the crown, causing it to eat away at the tooth, causing more tooth structure damage. Crowns usually come off because a cavity was under the crown. Here in the US, temporary dental cement is available in most drugstores, and it is the same as dentists use.