22 22. Anthropometric principles of face and teeth harmony. Anthropometric points. Planes and distances.

whats in it

Anthropometry of the face:

Anthropometric reference points:

planes

shape of the face

nelons triad

golden prop

Anthropometry of the face:

A systematic measurement of the physical properties of the human body, mainly dimensional proportions of the body size and shape

reference points:

•  Trichion→Glabella = upper third

• -  Glabella→Sub nasale = middle third

• -  Sub nasale→Menton = lower third

• -  Ratio between the medial/distal diameter and high of incisors

• -  Camper’s plane = connecting the tragus of the eat and Ala nasi

• -  Frankfurt horizontal plane = connecting the tragus to the ear and

  orbitale

• -  Parallelism between occlusal plane and bipupile line

• -  Parallelism between occlusal plane and Campers line

• -  Points on the midline – vertex, glabella, nasion, subnasale, gnathion

• -  Symetric points to the right and left – eurion, orbitale, zygion and gnathhion

shape of face

points on face?

0. The Shape of the face:

   • -  Specific landmarks on the face give a pentagon shape

   • -  Harmony of this “Pentagon” – it is the correlation between the

     shape of the teeth (incisors) and from the head (face)

• Trichion to Glabella (forehead height)

• Glabella to Subnasale (upper face height)

• Nasion to Menton (lower face height)

nelsons triad

0. Nelsons Triad:

   • -  Shape of teeth

   • -  Form of face

   • -  Form of dental arch

gold prop

0. Golden Proportions:

   • -  A proportion that is calculated by dividing the width of each central incisor, lateral

     incisor, and the canine by the total width of all 6 maxillary anterior teeth.

     To get a percentage then multiplying by 100.

   • -  the ratio is “1.6 : 1 : 1.62” i.e. the “Godlike proportions”

planes

. Frankfurt Horizontal Plane

• An anatomical reference plane that runs from the lowest point on the orbit (infraorbital rim) to the upper border of the ear canal (porion).

• Used in cephalometrics and prosthodontics to orient the skull or face in a natural, level position.

2. Camper’s Line (Ala-Tragus Line)

• An occlusal reference line from the ala of the nose to the tragus of the ear.

• Used in prosthodontics to help position the occlusal plane of dentures or restorations.