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The cross-arch curvature of the occlusal plane is described by the Curve of Wilson. This transverse curve runs across the arch and shows how the occlusal surfaces tilt toward the tongue as you move distally to the posterior teeth. It explains the lingual inclination of the posterior occlusal surfaces in a frontal view, reflecting the lateral (buccolingual) curvature of the occlusal plane.

In contrast, the Curve of Spee is the anteroposterior curvature of the occlusal surfaces seen in the sagittal plane. Monson's Curve describes a three-dimensional spherical path that combines both Spee and Wilson curves. Lingualized Occlusion is an occlusion scheme, not a curvature pattern.