What does "R line" in Ricketts' analysis focus on?

The "R line" in Ricketts' analysis is a crucial element that specifically focuses on the position from the nasion to the pogonion. This line serves as a reference in cephalometric analysis, providing insight into the skeletal relationships and facial form. By analyzing this line, practitioners can assess the balance and proportion of the face, particularly in relation to the vertical and anterior-posterior positions of the maxilla and mandible.

In Ricketts' analysis, understanding the R line aids in determining the orthodontic treatment objectives and outcomes by establishing a baseline for skeletal harmony. It facilitates the evaluation of facial aesthetics and helps in planning treatments that lead to an improved facial profile, while also considering functional occlusion.

Other options, while related to facial assessment, do not specifically pertain to the R line's measurement or purpose in Ricketts' analysis. The focus on the nasion to pogonion positioning is what distinguishes this analysis and highlights its significance in orthodontic practice.