The occlusion of the anterior teeth is the key to developing and perpetuating an "ideal" occlusion. 2. The anterior teeth protect the posterior teeth by disoccluding them in eccentric positions, and the posterior teeth protect the anterior teeth by receiving most of the forces of closure in centric position. 3. The anterior guidance is a result of both anterior tooth position and condylar border movements; both factors must be considered in the creation of an anterior guidance.