The three nurses previously charged answered bail yesterday (Tuesday 22 July 2014).
They have been charged with wilful neglect contrary to Section 44 Mental Capacity Act 2005 in connection with a further six patients.
Police officers have contacted all of the patients or the families of those patients concerned to keep them fully informed of developments.
All three nurses have been suspended since last year.
They are scheduled to appear before Bridgend Magistrates Court on Monday 28th July.