1. Part of an orthodontic appliance, having a predefined inclined plane that causes an alteration of the occlusal relation of the maxillary and mandibular teeth and permits their movement to a position not influenced by the cuspal surfaces of the teeth.
2. A plane developed on the occlusal surfaces of occlusion rims to position the mandible in centric relation.
3. Two or more vertically parallel surfaces created on abutment teeth to direct the path of insertion and removal of a removable partial denture.
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