Midline
Not necessarily identical to upper and lower lip tendons or model midline.
Canine Line
Determines width of upper anteriors
Positioning based on corners of the mouth or vertical extension of outer nasal wings
Smile Line
Decisive for length of upper anteriors
Tooth necks ideally above this line
Occlusal Plane
Follows upper edge of lower wax bite rim
Intersects midline, serving as the fixed point for incisal pin
Runs parallel with Campers line
Understanding these facial landmarks is essential for precise dental prosthetics design and placement, ensuring optimal aesthetics and functionality for patients.