Staff at the national children detention school campus staged a one-hour work stoppage yesterday.
Around 200 members of the Impact trade union are calling for an injury and assault leave scheme for workers who sustain injuries in the course of their work.
Workers are unhappy that while such a scheme is in place for prison officers in jails around the country, it does not exist for staff in children's detention facilities such as Oberstown.
Yesterday's action, which did not affect the provision of essential services at the centre, followed a ballot of workers for action "up to and including industrial action".
A spokesperson for the union said two staff members had been out of work for more than six months because of injuries sustained in the course of their work.
"There is an increasing level of assaults on staff members.
"In these cases, there are two workers who are out of work long term with no income," he said.
A departmental spokesperson noted the issues were being dealt with as part of an industrial relations process and added that it was hoped the issues would be resolved quickly.