Which item can be employed to dispense wax or impression material?

An extruder gun is designed for dispensing materials like wax or impression material in a controlled manner. This tool uses pressure to force the material through a nozzle, allowing for precise application. It is particularly useful when a smooth, even layer or a specific shape of material is required in dental procedures, such as creating impressions or applying wax. The extruder gun's design makes it suitable for tasks that demand accuracy and consistency, ensuring that the materials are dispensed exactly where needed.

In contrast, the other items have different purposes. For instance, a denture case is primarily used for storing dentures safely when they are not in use. A model trimmer is used for refining and shaping dental models, making it unsuitable for dispensing materials. A lab knife is utilized for cutting or trimming materials rather than dispensing them. Thus, the extruder gun is the correct choice for the task of dispensing wax or impression material due to its specific functionality.