Fig. 2
From: Posterior teeth angulation in non-extraction and extraction treatment of anterior open-bite patients
Posterior teeth angulations measurements in the maxillary and in the mandibular arch related to bisected occlusal plane (BOP). (1) Mx4.BOP (°)—long axis (apex to tip) of maxillary 1st premolar to bisected occlusal plane (BOP). (2) Mx5.BOP (°)—long axis (apex to tip) of maxillary 2nd premolar to bisected occlusal plane (BOP). (3) Mx6.BOP (°)—long axis (furcation to center of the crown) of maxillary 1st molar to bisected occlusal plane (BOP). (4) Mx7.BOP (°)—long axis (furcation to center of the crown) of maxillary 2nd molar to bisected occlusal plane (BOP). (5) Md4.BOP (°)—long axis (apex to tip) of mandibular 1st premolar to bisected occlusal plane (BOP). (6) Md5.BOP(°)—long axis (apex to tip) of mandibular 2nd premolar to bisected occlusal plane (BOP). (7) Md6.BOP (°)—long axis (furcation to center of the crown) of mandibular 1st molar to bisected occlusal plane (BOP). (8) Md7.BOP (°)—long axis (furcation to center of the crown) of mandibular 2nd molar to bisected occlusal plane (BOP)