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Fig. 3 | Progress in Orthodontics

Fig. 3

From: Posterior teeth angulation in non-extraction and extraction treatment of anterior open-bite patients

Fig. 3

Posterior teeth angulations measurements in the maxillary arch related to palatal plane (PP). (1) Mx4.PP (°)—long axis (apex to tip) of maxillary 1st premolar to palatal plane (ANS–PNS); (2) Mx5.PP (°)—long axis (apex to tip) of maxillary 2nd premolar to palatal plane (ANS–PNS); (3) Mx6.PP (°)—long axis (furcation to center of the crown) of maxillary 1st molar to palatal plane (ANS–PNS); (4) Mx7.PP (°)—long axis (furcation to center of the crown) of maxillary 2nd molar to palatal plane (ANS–PNS)

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