estorative dentistry
III.
Anterior I.
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. .
Aantique philosophers tried to define the beauty Beautiful is everything that is useful (Xenofon)
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Penta en arithmo"
(Pythagoras)
1/1,618 = 0,618
Golden cut
(Harmonious relation between the unit and its part)
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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Profile:
Rickets E-P!ane
Nasolabial Angle
■
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 mesiobuccal cusps 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 the wett part of upper lip.
Line of smile
Bilateral negative space
Enlarged
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Dental harmony
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
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Dental harmony
Interincisal spaces become smaller in distal direction
They become smaller in younger individuals
Relation between width
Width of upper central incisor is 70-80% its height
1,0 10,4-11,2 mml
0,8
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Optical size of the tooth
Optical height optical width
N
Position and length of the contact area
Position of proximal walls
length
= 0,618
width+length
Dental harmony
Shape of crown principally corresponds to shape of the face
Shape of the face: angular, oval a triangular Corresponding shapes of teeth
Harmony of the teeth and gingiva
Rember!
Check always red and white aesthetics!
Remember!
Interdosciplinary cooperation
Periodontology
Orthodontics
Prosthetics
Always take in account
Patient's requierement
Possibilities and limits of direct and indirect restorations
Periodontal considerations
Orthodontic considerations Prosthetic considerations
Harmony of Tooth structures
Basic terms -optic
We can recognise depht of the colour because of dispersion of ligth inside the air and water
Light
Elektromagnetic undulation
Beam
- reflection
- deflection
Various velocity of the light in various environment Relation of these velocities in two various environments is index of refraction
The light is absosbed and irradiated back in very short time 1012 s.
Special, „live" appearance od dentin
Opalescence Special effect on incisal edge Result of translucency of enamel
Mamelons Opalescence Halo efekt
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'tu
■
Color classification systems in dentistry
■ Albert Henry Munsell: Atlas of the Munsell Color system
Three aspects of colors Chroma Value Hue
■
3 Variables of colour
Hue- colour.
Result of
wavelength
Chroma - result of
amplitude
Value - cleanliness
chroma
Optical reading of the crown
colour
Desaturation
Opalescency
Tvar mamelons
.Halo efekt
Spots, special chracterizations
Hue - color category to
which the dentinal body tends
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Chroma - color saturation of the dentinal body
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Value -
opacity,transparency and degree of whitness of the enamel
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Intensives - spots that are frequently found in natural enamel.
White, blurred stains of different types - points, clouds, bands, flakes..
Opalescentes - blue or gray transparent effects found in the incisal third and/or interproximal
enamel (dentin-free
zone)
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Characterizations -existing colour characterization present in teeth, such as white or
amber bends, enamel cracks, colored mamelons and stains
Dental shade guides
Remember:
I
shade guides are made of materials that are not the same as the composite resins and ceramics.
They are useful only as a basic reference.
Vita shade quide
■ Is the most commonly used in dentistry
■ Four categories according to their incidence:
Orange -red: A
Orange - yellow: B
Brown - gray: C
Brown: D
Chromatic scala of
composite materials
Dentin shades
Enamel shades
Special effects
Natural tooth
■ Dentin
Color of teeth Is derived from the dentin
■ Enamel
Increases the brightness (value) and acts as a selective light filter
Reproduction the tooth
—■ Inner layer (In): dentin shade.
Imparts chromaticity. Opacity, Sight svattering, fluorescence, yellowish tooth
appearance.
External layer (Out): enamel shade
which is responsible for regulating the tooth's value, luminosity and transparency. It modifies the final colour of the tooth.
Reproduction the tooth
—Intermediate layer (Mid):
Is used to reproduce special features that occur spontenously in netura enamel and are located in the midddle of the stratification (opalescentes, intensives, characterizations).
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Enamel shade
Dentin shade
Desatu ration (loosing of the hue saturation)
Shape - tooth
morphology
■ Tooth morphology
1. Outline: Global tooth shape
2. Primary anatomy:
Anatomical ceown shape given by the transition angles determinates the curvature and the fine tooth shape
Shape - tooth
morphology
■ Tooth morphology
3. Secondary anatomy
Macrosurface - consequence of tooth development. Vertical texture.
3. Tertiary anatomy
Microsurface. Developlemntal gooves become evident as small lines that cross the vestibular surface horizontally. Horizontal texture
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