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Table 2 Three occlusal planes

From: Twin study—genetic comparison of matrix versus intramatrix rotation in the mandible and three different occlusal planes

Bisected occlusal plane (Downs)
- Bisecting line through overlap of the distobuccal cusp of the first permanent molars and incisors overbite
Functional occlusal plane (Wits)
- The line bisecting the molars and premolars overlaps
MM bisector occlusal plane (Hall-Scott)
- The maxillary-mandibular planes angle bisector