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Proportions Between Teeth and Smile
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In the drawings of older children the eye-dashes become circles and the lips are apart (Fig iii).
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We are thus presented with a new group of fascinating Golden Proportions that are helpful in prosthodontics. Note
that the lips apart drawn in figure iii do not extend right to the corner of the mouth they actually stop some
distance from them. Thus there is an area of darkness or neutrality between the teeth and the corner of the smiling
mouth which is one of the most important factors in giving prosthesis a natural appearance. |
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This again is shown in photo where the gauge, with one point on the midline, the other on the width of the smile
shows the middle point on the buccal surface of first premolar. The Golden Mean Gauge shows that the corner of
the arch divides the smile into a larger tooth part and a smaller neutral space and gives us another guide as to
how to arrange the visual effect of this important corner. The same phenomenon is also illustrated in the figure
below where the edge of the Grid lines up with the edge of the smile and the 4 teeth end at this position.
In the aesthetically pleasing smile the spaces between the corners of the mouth and the dental arch form a backdrop
in which the anterior aesthetic segment is featured. This is a frequent variation of the Golden Proportion which
can be seen in more detail the bilateral form.
Eyes to teeth
The WHITE of the eyes AB is in the Golden Proportion to the space between the eyes BC as seen in the children's
photo of eyes fig(iv) below.
From this we can conclude that the WHITE width FG of the Anterior Aesthetic Segment is in the Golden Proportion
to the WHITE of the eyes AB, as follows:
By measurement it will be found that the width of the smiling lips from one corner of the mouth to the other is
equal to the distance between the bridge of the nose plus the width of the eye, AC=DE (fig iv).
EYES
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Smaller
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.618
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Eyes |
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AB
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Bridge
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BC
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Larger
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--------
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=
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----
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=
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------ |
= |
---
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= |
------------
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=
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---
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=
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-------
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Larger
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1
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Bridge |
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BC
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Eye+ Bridge
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AC
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Whole
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SMILE
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FG
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teeth in Smile
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Larger
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---
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=
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---------------
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=
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-------
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DE
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width of Smile
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Whole
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BC Bridge = FG Teeth showing in Smile.
AC Eye + Brdge = DE Width of Smile.
EYES & SMILE
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BC - Bridge - Larger
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FG - Teeth in Smile - Larger
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----------------------------
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=
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-----------------------------
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AC- Eyes+Bridge - Whole
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DE - Whole Smile - Whole
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BC (Bridge) = FC (Teeth in Smile)
and AC (Eyes + Bridge) = DE (Width of Smile)
Therefore: AB - the white of Eyes is in Golden Proportion to white of teeth showing in Smile.
