whether a new traffic regulation order is required in order to make an emergency traffic regulation order permanent.

There is no order generally referred to as an emergency traffic regulation order in Scotland.
Traffic authorities may make temporary traffic regulation orders (which are known as TTROs), under the Road Traffic Regulation Act 1984. These can prohibit or restrict the use of a road for a number of reasons, such as road works, damage to the road or danger to the public and generally can last for up to a maximum of 18 months. The Scottish Government issued guidance to local authorities on the use of TTROs and Notices in relation to the Covid-19 response in April 2020 which can be found at coronavirus-covid-19-guidance-on-temporary-traffic-regulation-orders-and-notices.pdf (transport.gov.scot)
There is no procedure for a TTRO to become a permanent order. A traffic authority can only make a permanent traffic regulation order in compliance with the relevant provisions of the Road Traffic regulation Act 1984 and the relevant procedures as contained in the Local Authorities' Traffic Orders (Procedure) (Scotland) Regulations 1999 (for local roads) or the Secretary of State’s Traffic Orders (Procedure) (Scotland) Regulations 1987 (for trunk roads).