Minnesota is the only state I know of which has tried to outlaw paper dental records. There may be others. The two reasons cited for the 2007 law's repeal years later: Increased cost and danger over paper dental records.
See: “Solo Practitioners Exempt from EHR Implementation in Minnesota.” By Vera Gruessner for EHR Intelligence, May 21, 2015.
Minnesota’s EHR mandate was the EHR industry’s canary. That bird was stillborn.