What is e line in orthodontics?

Fundamentally the “E” plane is simply a line drawn from the tip of the nose to the tip of the chin. And the farther behind the plane the lips are, the more likely the nose and chin will dominate the smile. The key was to evaluate the “E” plane relationship prior to performing orthodontic treatment.

What is the Ricketts line?

Robert Ricketts was able to define a specific relationship between the nose, lips, and chin from a profile perspective. Essentially, the “E” plane is simply a line drawn from the tip of the nose to the tip of the chin. His key assessment was to look at how the upper and lower lip related to that line.

What is the Esthetic line?

The esthetic line is a line to connect from the tip of the nose to the protruding point of the lower jaw when looking from the side face. For Japanese, it is said that it would be esthetic if the upper lip and lower lip are located 2mm inside from the esthetic line, but typical Japanese lips touch the E-line.

How do you measure a lip strain?

Vermilion upper lip thickness in the closed lip position (VULT-C): A linear distance measured in mm from Incision anterius (Ia) to the Labrale superius (Ls). The difference of a and b measurements in mm is the lip strain by Holdaway’s method.

What is ANB angle?

Cephalometric angles According to the Steiner analysis: ANB (A point, nasion, B point) indicates whether the skeletal relationship between the maxilla and mandible is a normal skeletal class I (+2 degrees), a skeletal Class II (+4 degrees or more), or skeletal class III (0 or negative) relationship.

What is the Interincisal angle?

The interincisal angle measures the relative spatial position along the long axis of the most prominent (anteriorly positioned) maxillary and mandibular central incisors. It determines the degree of procumbency (labial inclination) of the incisors.

What is Holdaway ratio?

Holdaway ratio (LI-NB/Pg-NB) A measurement introduced by R. A. Holdaway to evaluate the relative prominence of the mandibular incisors, as compared to the size of the bony chin.

What is your philtrum?

The philtrum is the midline groove in the upper lip that runs from the top of the lip to the nose.

What is the finger trap test?

The “finger trap test”, a simple test using one’s finger that determines if you’re a hottie or nottie. To find out if you’ve struck the genetic jackpot, simply place your index finger against your nose and chin. If your finger touches your lips, congratulations – you’re a stunner!

How do you measure your upper lip?

Upper Lip Length What is significant, however, is the relationship of the upper lip to the maxillary incisors and to the commissures of the mouth. 12 Lip length should be roughly equal to the commissure height, which is the vertical distance between the commissure and a horizontal line from subnasale (Fig. 2A).

What is the vermilion border?

The vermilion border is the line just above the colored portion that connects the lip tissue to the rest of your face. As you age, your lips experience a loss of soft tissue, resulting in thinner lips without height or definition.

What is SNB angle?

SNB: the angle between the sella/nasion plane and nasion/B plane (normal value at the end of growth 80 ± 2°). This angle assesses the antero-posterior position of the mandible relative to the upper cranial structures.

Where do the lips lie behind the E-line?

Ricketts mentioned that the lips lie behind this E-line at a mean distance of 4 mm for the upper and 2 mm for the lower lip respectively. Burstone’s [5] B line was drawn from soft tissue sub-nasale to soft tissue pogonion.

Where is the reference line for lip position?

Steiner [3] evaluated the soft tissue profile by connecting a line (S line) from the middle of the S-shaped curve between the tip of the nose and sub-nasale to the soft tissue pogonion and mentioned that the lips should touch the reference line.

What do Orthodontists look for in a lip?

For a long time, orthodontists have focused on the position, size and fullness of the lip as the most important features in determining beauty. Several lines and parameters have been introduced to assess the antero-posterior position of the upper and lower lips and the aesthetic quality of the profile.