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Restorative dentistry – part 1.
Colour and shade
Aesthetics is a science about beauty.
Iti is connected with sensual perception.
Rules are changing during the time a there
are differences in various regions. .
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„Penta en arithmo“
(Pythagoras)
1/1,618 = 0,618
Golden cut
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Perception of the object
◼ Composition
◼ Single items
◼ Harmony
◼ Symetry
◼ Dominance
◼ Lines
Dentofacial harmony
◼ Imaginary lines – stuctures must have
harmonious relation to them
◼ Teeth are in harmony with the face, they
can attract our attention and distract it form
other structures
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Horizontal
a vertical lines
axis
Profile:
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Balance of lip, nose
and chip.
Nasolabial angle:
90° – 95 °men
100° - 106° women
Rickets line:
4 mm before upper
2 mm before lower lip
Line of smile
◼ Connects incisal edges of upper frontal
teeth and touches cusos of upper molars.
Lower border is lower lip. Line of lower lip is
parallel to line of smile.
◼ Upper central incisors should be in touch
with wett part of upper lip.
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Line of smile
lroubalikova@gmail.com 10
Bilateral negative space
Normal Enlarged
lenka.roubalikova@tiscali.cz 12
Dental harmony
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Inclination of long axis
Slight mesial inclination of long axis
Slight inclination vestibulary
Position of contact points:
They become smaller and move apically
(50:40:30)
Their elongation can optically widen teeth
Dental harmony
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Interincisal spaces become
smaller in distal direction
They become smaller in younger
individuals
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Relation between width
and height
Width of upper central incisor is
70 – 80% its height
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Optical width
Golden cut
length
= 0,618
width+length
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Roubalíková L. Méně obvyklý případ řešení obráceného skusu.
Prakt zub Lék;48: 117-120.
Shape of crown
principally corresponds to
shape of the face
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◼ Shape of the face:
angular, oval a triangular
◼ Corresponding shapes of teeth
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Front
Zygomatic line
Mandibular line
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Harmony
Curvature of the labial surface – for
reflection of the light
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Reflection of the light
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Surface texture
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Harmony of
Tooth structures
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Basic terms -optic
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We can recognise depht of the colour because
of dispersion of ligth inside the air and water
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Světlo
◼ Elektromagnetic undulation
-Wave length
-Amplitude
-Quantum
Ray
- reflection
- deflection
Various velocity of the light in various environment
Relation of these velocities in twpo various environments
is index of refraction
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chroma
value
hue
3 Variables of
colour
Hue– colour.
Result of
wavelength
Chroma – result of
amplitude
Value - cleanliness
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Transparency
Translucency
OpacitaOpacity
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Enamel is translucent
1 2 3
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The light is absosbed and irradiated back in very short time
10-12 s.
Special, „live“ appearance od dentin
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Opalescence
Special effect on incisal edge
Result of translucency of enamel
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Mamelony
Opalescence
Halo efekt
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Optical reading of the
crown
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colour
Desaturation
Opalescency
Tvar mamelons
Halo efekt
Spots, special
chracterizations
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Chromatic scala of
composite materials
Dentin shades
Enamel shades
Special effects
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◼ Shape
◼ Stratification
◼ Surface texture
◼ Polishing
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