What is the difference between an Arcon and Nonarcon articulator?

The distinction between Arcon and Nonarcon articulators primarily lies in the configuration of the condylar elements and their attachment locations on the articulator.

In an Arcon articulator, the condylar spheres (which simulate the movement of the condyles in the temporomandibular joint) are attached to the lower member, while the upper member holds the maxillary cast. This design allows for a more accurate replication of the anatomical orientations of the jaw movements, closely reflecting the patient's condylar relationship. The Arcon configuration is advantageous as it helps in maintaining a realistic representation of occlusal relationships and jaw movements.

In contrast, a Nonarcon articulator positions the condylar spheres on the upper member, separating the functional relationship of the condyles from their anatomical attachment in the human skull. This can lead to discrepancies in articulating movements and occlusal relationships, making it less favorable in terms of accurate jaw movement simulation.

Choosing the Arcon design, therefore, supports better fidelity to the biological movements in dental practices. The understanding of their functional differences is crucial for dental professionals in selecting the appropriate articulator for their clinical and laboratory needs.