Download esthetics and shade selection

ESTHETICS AND SHADE
SELECTION
1
CONTENTS
•
•
•
•
•
•
ESTHETIC (ANATOMY OF SMILE & APPEARANCE ZONE)
LIGHT AND COLOR
DIMENSION OF COLOR
SHADE GUIDES
SEQUENCE OF SHADE SELECTION
REFERENCES
2
Esthetic
Anatomy of smile & appearance zone depend on some factors of esthetic dentofacial
composition
Frame and Reference: are the constructional system that gives shape; work as a standard for
measuring or constructing.
Proportion and Idealism: the relation of one part to another or to the whole with respect to
magnitude,quantity,or degree;a standard of perfection,beauty,or excellence.
Symmetry: is the correspondence in size,shape,and relative position of parts on opposite sides of
a dividing line or median plane or around a center or axis.
Perspective and Illusion: are the technique or process of representing on a plane or curved
surface the spatial relation of objects as they might appear to the eye.
Narrowing
Widening
shortening
Light and color
•
•
Without light color does not exist.
Scientifically, light is described as
visible electro-magnetic energy. the
eye is sensitive only to the visible part
of the electro-magnetic spectrum, a
narrow band with wavelength of 380
to 750 nm.
• COLOURS:
– Primary colors:
– Red, Yellow, Blue
• These colors cannot be formed by mixing other colors.
They occur naturally by themselves.
– Secondary colors:
•
•
•
•
Are formed by mixing primary colors.
RED + Yellow = Orange
Yellow + Blue = Green
Blue + Red = Violet.
– Complimentary colors:
They look good together they enhance appearance of
one and another.
Red – Green; Yellow-Violet; & Blue-Orange.
– E.g. A3 shade contains orange hue + blue stain.
5
Dimensions of color
1) VALUE (BRILLIANCE): Is the relative lightness (brightness) or darkness of the hue.
On a scale of black-white (High value = white & Low value = dark)
E.g. Hue A of Vita shade (A1-brightest; A4- darkest)
2) CHROMA – Is intensity or saturation of color tone (Hue)
e.g. In Vita shade guide A1- lowest chroma, A4 – Highest chroma.
3) HUE – Is simply the colour tone i.e. RED, BLUE, YELLOW etc.
4) TRANSLUCENCY: It is best represented by value differences. Highly translucent teeth tend
to be lower in value.
– Chroma  - value 
– E.g. A4 has high chroma and low value shade, A1 has low chroma and high value shade.
6
Shade Guides
1.
2.
3.
4.
Vita pan classic
Chromascop and
Vitapan 3D shade master
Vintage Halo shade guide (Shofu dental)
Vita pan Classic – in this hue is categorized according to group or families:
A – Orange
(A1,A2,A3,A3.5,A4)
B – Yellow.
(B1,B2,B3,B4)
C – Yellow/Grey
(C1,C2,C3,C4)
D – Orange / Grey (D2,D3,D4)
•
Chromoscope system:
– Instead of letters to identify shade numbers were used:
– 100 – White, 200 – Yellow, 300 – Orange, 400 – Grey, 500 – Dark.
7
Vitapan 3D shade master – By this, shade selection is a logical progression of 3 simplified
steps, enabling the clinician to find desired shade quickly.
1– value determination – value levels from 1-5
1: lighest (high value)
5: darkest (low value)
2- chroma determination – 1-3
1: least chromatic, 3 : more chromatic
3- hue determination- more yellowish (L), more reddish (R)
1-5 levels of value
Chroma.1,2,3
Hue- L-M-R
more yellowish (L), more reddish(R)
8
ADVANCES IN SHADE DETERMINATION
Easyshade system Clear Match System ShadeRite Dental
Vision System
The Vita Easyshade
Colorimeters
Shade Scan
9
SpectroShade
Advantages of technology based ( advance) systems
• Less subjective
• Less time
• Dehydration of tooth is no more an issue
• Shade of a restoration can be verified before placement of a restoration
Disadvantages
• Cost
• Still subjective i.e. depends on the skill and knowledge of the technician
fabricating the restoration
10
•
Shade guides for oral soft tissues:
1)Lucitone 199 (Dentsply trubyte)
4 glossy shade types
•
Original (OR)
•
Light (LT)
•
Light reddish pink (LRP)
•
Dark (DARK)
2) Ivoclar Plus Gingiva indicator (Ivoclar V)
4 shades –
3) IPS gingival (Ivoclar)
5 regular shades – G1 – G5
4) Gummy gingiva indicator set (Shofu Dental)
3 reddish shades – light, medium, dark
11
Sequence (methods) of Color matching
Preliminary
• Ask patient to remove any ( large jewelry, eyeglass, facial makeup) that could distract
the dentist
• Shade matching be performed at the beginning of the appointment
• Rubber dam should not be placed & tooth should not be dried too much
Dentist position
• Tooth should be viewed along the long axis
• To avoid Metamerism the choice be verified under different light source & from
different angles
• If the patient spends most of the time in a particular light source that light be
used to match shade
• Dentist’s eye should be at the level of patient tooth at standard reading distance
of 25 – 33 cm
12
Tab placement
• Tab be placed parallel to the tooth & same relative edge position
• Tab carrier should be put along its normal axis to avoid impact on tab color
•
•
•
•
Time length & pause
First impression is usually the best match
Trials be limited to 5 sec
Matching of other attributes :
Surface roughness & gloss of the tooth & tabs be compared
If the tab & tooth being matched are not of the same texture both should be rewetted with
water to eliminate this difference
13
REFERENCES
•
Fundamentals of Fixed Prosthodontics, Herbert T. Shillingburg
•
Contemporary Fixed Prosthodontics ,Stephen F.Rosensteil
•
Goldestein RE. Aesthetics in dentistry. Bc Decker inc., 1998
14