Final answer:
The impression material that cannot be mixed with an automixing system is C) Polysulfide. Addition-reaction silicone, Polysiloxane, and Polyether can all be used with automixing systems in dental practices.
Step-by-step explanation:
All the following impression materials can be mixed with an automixing system except Polysulfide. Addition-reaction silicone, Polysiloxane, and Polyether are all materials that can typically be used with automixing systems to prepare dental impressions.
Polysulfide, on the other hand, is more traditionally mixed manually due to its longer setting time and the requirement of a specific activator that may not be compatible with the constraints of an automixing system.
Silicones and polysiloxanes, which are often used interchangeably to describe polymers with a silicon-oxygen backbone and organic side groups, are versatile materials used in dentistry for their desirable properties such as good flow, easy removal, and detailed reproduction of the oral structures.
Polyethers are also commonly used in dental practice as they provide accurate impressions with good hydrophilic properties, though they can be less pleasant for the patient due to their taste and rigidity.