Which type of articulator is non-adjustable and accepts a single static registration?

• A. Class 1 Articulators
• B. Class 2 Articulators
• C. Class 3 Articulators
• D. Class 4 Articulators

Answer: (A)

The main idea here is about articulator types and how they handle jaw movements. A non-adjustable, simple hinge articulator is designed to hold the casts in a fixed position and use a single static registration to set that position. It cannot reproduce jaw movements, so you’re limited to mounting the models in one relation, typically a centric relation record. That’s why it fits the description perfectly: one static registration and no adjustability.

In contrast, the other types are designed to simulate more complex jaw movements. Semi-adjustable and fully adjustable articulators allow you to set condylar guidance, incisal guidance, and lateral or Bennett movements, and they often require multiple records or more precise relations. Their built-in adjustments are what distinguish them from the non-adjustable kind, which is used mainly for simple mounting rather than occlusal analysis or appliance design.