<prompt> The zero degree anatomic teeth is used in:Sharp ridgeFlat ridgeRidge with undercutWell contoured ridge  <response>: Monoplane OcclusionCuspless teeth 0o on a flat plane with 1.5-2.0 mm overjet.No cusp to fossa relationshipNo anterior contacts in centric positionPoor residual ridgesPoor neuromuscular control Bruxers, CP, etc.,Previously successful with monoplane dentures or severely worn occlusion on the previous dentureArch discrepancies- Class II or III or Cross-biteImmediate Dentures- Except when opposing natural dentitionPotential poor follow-up. 