Fig. 4.

A lateral view comparison of facial lines before (A) and after (B) lip augmentation with imporved facial profile featurs. The blue line represents the ‘Sn-Pog’ line, extending from the subnasale (Sn) to the soft tissue pogonion (Pog’), which lies on a tangent to the upper and lower lips (Riedel line). The red line is the Riedel line, and the green line is the Ricketts line, which should ideally connect the Pog’ and the pronasale (Prn), with the lips positioned behind it. The post-augmentation image (B) illustrates the alignment of the Riedel and Ricketts lines, showing that the angle between them has diminished to the point where the lines are superimposable, indicating a change in the facial profile congruent with the desired aesthetic outcome of lip augmentation.