Incisal guidance is the anterior determinant of occlusion because the position and inclination of the front teeth set how the mandible moves during protrusive and eccentric movements, directing the path of the bite and causing posterior teeth to disocclude at the right time. A steeper incisal guidance tends to separate the posterior teeth earlier during forward movement, while a flatter incisal guidance allows more posterior contact. Condylar guidance, on the other hand, describes the path of the jaw joints themselves and mainly influences posterior contacts. The Bennet angle relates to the mediotrusive movement of the balancing side in lateral excursions, another posterior determinant of occlusion. Christensen's phenomenon is an observed pattern in eccentric movements where posterior teeth separate due to anterior guidance; it’s a consequence of those movements rather than the primary determinant.