Fully Adjustable Articulator Systems: Saturation, Interpretive Collapse, and Boundary

This manuscript examines fully adjustable articulator systems as the terminal case of mechanical freedom within the reactor framework. It analyzes the behavior of articulators under saturated adjustability, where multiple internal constraints become simultaneously selectable and hierarchically indeterminate. The study demonstrates that beyond a critical threshold of freedom, mechanical behavior remains producible but loses interpretive priority. Stability becomes local and contingent, metastable regions emerge intrinsically, and equivalent configurations yield divergent responses without privileged causality. Increased recording accuracy or parameter completeness does not restore mechanical determinacy. This work functions as a standalone mechanical delimitation and as a terminal component of the Articulators: Mechanical Behaviour and Geometrical Understanding Corpus. It establishes the boundary at which mechanical explanation ends and responsibility shifts irreversibly from system to operator. The Corpus closes here by design, not by omission.