Some angle measurements are used in the aesthetic analysis of the face. These
a;Nasofacial angle, b;Nasomental angle, c;Mentocervical angle, d;Submental-neck angle
Nasomental angle=b
The average is 128 degrees. It varies between 120-132 degrees.
Mentocervical angle=c
The average is 85 degrees. It varies between 80 – 95 degrees.
Nasofacial angle=a
Normally it is 36 degrees. It varies between 30-40 degrees.
Submental–Neck Angle=d
It is 126 degrees for men and 121 degrees for women.
Nose-Upper Lip angle (Nasolabial Angle)
It is the angle between the lines passing tangentially from the columella and the upper lip. This is 102 degrees for men and women. This angle can vary between + and – 8 degrees. The increased angle may be due to an upturned nose or backward curved lips. This angle is relatively constant in growing individuals aged 7-17 years.
In the evaluation of this angle, the numerical measurement value is not sufficient. When evaluating this angle, it is divided into 2 by a horizontal line. Along with the value of this angle, it is also important in which direction it divides the angle.
When this angle is divided into two by the red horizontal line, angles a and b appear. Angle a belongs to the columella and angle B belongs to the upper lip.
In this example, the nasolabial angle 103 is within the normal range, but when the angle is divided horizontally, the columella part is 0 and the other upper lip part is 103 degrees.
Lip-submental fold-chin angle
Lower lip, submental fold, chin plan angle is 90-110 degrees. Its enlargement means retrognatia, that is, the development of the jaw located behind
Facial-Facial Angle
This angle is measured in the patient profile and determines the main classification of the face. It is formed by the combination of the most anterior point of the eyebrow eyebrow-Glabella, the nose milk-lip junction-Subnasale and the frontmost soft tissue point of the chin-Pogonion points. The ideal angle range is 168.7±4.1. This angle remains constant in individuals with normal growth. This occurs as a result of the forward movement of the Subnasale with the growth of the nose and the forward movement of the Pogonion as a result of the growth.
There are other angles of the face defined from the profile. These;
nasal angle=atragus – is the angle between the nasion and the tragus – the tip of the nose.
Maxillary angle=b is the angle between the tragus-nasal tip and the tragus-upper lip.
Mandibular angle=c tragus – the angle between the upper lip and the tragus-pogonion.
a; nasal angle is 23.3 degrees.b; The maxillary angle is 14.1 degrees. c; The mandibular angle is 17.1 degrees.
Less commonly used angles;
Facial angle; It is the angle of the line connecting the tragus with the middle of the line connecting the nasion and the pogonion. It is 102.5 degrees.
Maxillofacial angle; It is the angle between the nasion and the line connecting the middle of the upper lip line with the tragus. It is 5.9 degrees.
