The maxillary incisor labial face tangent: clinical evaluation of maxillary incisor inclination in profile smiling view and idealized aesthetics.
Farhad B NainiShaadi ManouchehriZaid B Al-BitarDaljit S GillUmberto GaragiolaDavid WertheimPublished in: Maxillofacial plastic and reconstructive surgery (2019)
In natural head position, the ideal inclination of the maxillary incisor crown labial face tangent in profile view will be approximately parallel to the true vertical line and thereby approximately perpendicular to the true horizontal line.