ADA NBDE National Board Dental Part II

Answer: C - Constrainer is not a developing solution. Developing solutions are accelerator, restrainer, developing agent, and antioxidant preservative. Accelerators are composed of an alkali salt that is conducive for developing reaction. Restrainers are composed of potassium bromide and control the actions of the development agent. Developing agent is mainly hydroquinone that converts exposed silver salts into silver metallic ions. Antioxidant preservative is within the fixer solution to prevent the oxidative processes.