This document defines and describes key concepts in occlusion, including: - Static occlusion refers to tooth alignment and articulation, while dynamic occlusion includes jaw function. - Ideal occlusion includes theoretical principles that an occlusion should have, while physiologic occlusion allows for individual variation. - Tooth contacts include centric contacts during jaw closure and eccentric contacts during jaw movements. - Imaginary curves like the Curve of Spee and Curve of Wilson describe ideal occlusion relationships. - Centric relation is the most superior jaw position while centric occlusion is maximal tooth intercuspation. - Disclusion describes how teeth separate during jaw movements due to condylar and incisal guidance.