Q38. Aesthetic proportions, dimensions, lines, planes:

whats in it

• basic planes

• lines

  aesthetics of teeth

• aesthetic general criteria

• SPA

• smile line/incisal curve

• midline

basic planes/3 parts of face

LINES

horizontal/frontal/sagittal/frankfurts plane

midline / campers line / interpupillary line ? frankfurt horiz - these three must be equal/symmetrical = if patient loses teeth, must be restored

Every patients face has 3 parts:
1st starts from trichion to the glabella 2nd part is between glabella and subnasale
3rd part is between subanasale and gnathion

frankfurt line

campers line

starts from orbitale to porion (acousticus externus). It is widely used in orthodontic treatment.

campers: ala tragus

• In the back (posterior) part of the mouth, the wax rim should be parallel to Camper’s line.

• In the front (anterior) part of the mouth, the wax rim should be parallel to the interpupillary line, which is the imaginary line between the centers of both pupils.

for the vertical dimension of the occlusion (VDO)

aesthetics of teeth and then aesthetic criteria in gerneral

teeth: shape, (form), size. shade

Flush and fisher =

Sex (eg. Male/female)

1. Personality (eg. Soft/vigorous)

2. Age (eg. Old/young = mamelons)

aesthetic criteria in general:

shape of face

configuration of gingiva/lips

Alignment, Proportions, Shape/form, and Color of the teeth.

smile line/incisal curve

• line that connects incisal edges of the upper frontal teeth from canine to canine,

• this line must be parallel to the curvature of the lower lip,

• it shows symmetry of the smile.

• It is parallel with the interpupillary axis,

• it is perpendicular to the midline.

Midline

: Centered on the face, is perpendicular to the interpupillary line. Midline of smile should correspond to features nearest to it, such as the column of the nose or the philtrum. Teeth on either side of the midline should be balanced. Perfect horizontal symmetry occurs when all anterior teeth have the same shape, looking like central incisors. It is monotonous, and it appears artificial.

golden ratio

These aren’t physical measurements, but how the teeth appear when viewed from the front.

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🎯 Example in Smile Design:

Let’s say the visible width of a central incisor is 8 mm:

• Lateral incisor = 8 / 1.618 ≈ 5 mm

• Canine = 5 / 1.618 ≈ 3.1 mm

This ratio creates a balanced and natural-looking smile.