there is disclosed a dental articulator of the arcon type having a centric lock mechanism including a pin carried on the upper frame member and a cooperative hook arm which is pivotally mounted on the lower frame member and movable between pin engaging and detenting and pin releasing positions . the latch mechanism is spring biased to restrain the hook arm in the pin detenting position from which it can be released by pressure application to overcome the resilient bias of a compression spring loading on the mechanism . the latch mechanism is operative to lock the upper and lower frame members together when the frame members are in their closed or centric position and when the frame members are open , freely permitting rotational movement of the members between the open and closed positions while , nevertheless , retaining the frames interlocked . the articulator is also disclosed with a simple fossa guide structure allowing for a limited degree of freedom of movement without any adjustment capability and , in an alternative embodiment , with fossa guides permitting the independent adjustability of the angle of the eninentia , immediate and progressive side shifts and , optionally with an entirely adjustable fossa including adjustable top and / or rear fossa guides .