One visit crowns are a permanent option, like traditional crowns. The process is faster, and you are able to move on in life with less time requirement than a traditional crown would take, which requires more appointments.
However, one crown visits are not an option for every patient, especially if the underlying tooth needs further care or treatment. It also might not be an option if you want to have a crown that is more durable and lasts longer. Same-day crowns are made from ceramic material, which is why they tend to wear down sooner. By comparison, traditional crowns are made from porcelain, which lasts longer.