color & shade matching ppt.unlocked (1)

7/21/2019 Color & Shade Matching PPT.unlocked (1)

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(from Chu, SJ et al. Fundamentals of Color: Shade Matchingand Communication In Esthetic Dentistry. Quintessence !!"#


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Color and Shade Selection

Edmond R. Hewlett, D.D.S.

Esthetic Dentistry RT443c

UCLA School of DentistrySrin!, "##$


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%&er&iew

SeeColor science ' ercetion

Tooth otics

Ena(leThe

en&ironment

Comm)nicate*ita Shade +)ideshotos

E. Hewlett, DDS


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-hat is Color

E. Hewlett, DDS


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-hat is Color

Color is defined as the /)ality of an o(0ect

or s)(stance with resect to li!ht reflected(y it, )s)ally determined &is)ally (y

meas)rement of hue, chroma, and value.

E. Hewlett, DDS


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The 1)nsell Color System

rofessor A.H 1)nsell

2asic rinciles first )(lished in

#$

1)nsell Color ComanyEst. 5 to de&elo color standards

Contin)ed de&eloment at 6at7l. 2)rea) of

Standards, %tical Soc. of America

E. Hewlett, DDS


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4#7s 8 Re&ised 1)nsell system standardi9ed

(y:

;nternational Commission on ;ll)mination


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Color comonents:

H)e

Chroma

*al)e

E. Hewlett, DDS


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H)e

The color itself

The attri()te of acolor (y which we

distin!)ish red from

!reen, (l)e from

yellow, etc

E. Hewlett, DDS


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Chroma

The intensity of the

color

Low chroma >wea?@

Hi!h chroma

>hi!hly8sat)rated@

E. Hewlett, DDS


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*al)e

The (ri!htness of the

color

Hi!h &al)e (ri!hter


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*al)e


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1)nsell Color Sace

Arran!ement of allcolors accordin! h)e,

chroma, and &al)e in

a 38D sace

E. Hewlett, DDS


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%ther Color Terms

%acity

imenetra(le (y li!ht

refective8 neither transarent or

transl)cent

Transarencycaa(le of transmittin!

li!ht

Transl)cencydiff)sed transmission of li!ht

E. Hewlett, DDS


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Color ercetion

E. Hewlett, DDS


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Color ercetion

Similar colors aear different )nder

different conditions d)e to

Li!ht so)rce tye and an!)lationSi9e and shae differences

;nfl)ence of (ac?!ro)nd color ' li!htin!

ercetion an!le


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eye

ercetion

en&ironment o(0ect s)rface

E. Hewlett, DDS


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eye

ercetion

en&ironment o(0ect s)rface

E. Hewlett, DDS


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The H)man Eye

Recetors: rods and cones

Rods con&ey shades of !ray


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The H)man Eye

Color(lindness affects

8in83## females

8in83

males

+et tested

E. Hewlett, DDS


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;ll)mination

E&erythin! that we see is refected light

Full spectrumli!ht is needed to see color

Color missin! in the li!ht so)rce cannot (ereflected

;ma!e from Ch), et al "##4E. Hewlett, DDS


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;ll)mination So)rces

Dayli!ht


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;ll)mination So)rces

Recommended li!htin! for acc)rate shade

ta?in! in dentistry:

$$## FRelicates northern nat)ral midday

dayli!ht

(alances all h)es in the sectral c)r&e

-or?in! distance: " to $ inchesArm7s len!th

Aroriate en&ironment

E. Hewlett, DDS


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Color corrected so)rce


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;ll)mination

Use the aroriate ill)mination so)rceB

incandescent fuorescent

5,500 K

ima!es from Ch), et al "##4E. Hewlett, DDS


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1etamerism

%(0ects that aear similar )nder one

condition ()t different )nder another.

i.e., an o(0ect aears to (e differentcolors when &iewed )nder different li!ht

so)rces

E. Hewlett, DDS


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Color corrected so)rce


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1etameric air

$,$## F l)orescent ;ncandescent

Tooth I5 8 )nrestored

Tooth I 8 crown



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1etamerism

Easy to reco!ni9e, imossi(le to control

6ewer materials hel

chameleon effectJ fl)orescence

1ay need to eGlain to atient

or dental ceramics:

1ore oa/)e orcelain

more

metamerismB

E. Hewlett, DDS


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Fey %tical roerties of Teeth

l)orescence

%alescence

Transl)cency



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l)orescence

Emission of &isi(le li!ht )on eGos)re to

fl)orescent li!ht

Dentin KK Enamel



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l)orescence

Emission of &isi(le li!ht )on eGos)re to

fl)orescent li!ht

Dentin KK Enamel%aceo)s dentin orcelains

Dentin8li?e fl)orescence

Reduced metameric eect



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%alescence

A(ility of a translucentmaterial to

aear (l)e in reflected li!ht

aear red8oran!e in reflected li!ht



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%alescence

Under direct ill)mination

reflectance of short wa&elen!ths


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%alescence

Under transill)mination

reflectance of lon! wa&elen!ths


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%alescence

Enamel KK Dentin

more transl)cent, more

crystalline

;ncisal orcelainsCan mimic enamel oalescence



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Transl)cency

Transmission and diff)sion of li!ht

Con&eys deth

and &itality

ima!e from Ch), et al "##4E. Hewlett, DDS


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Transl)cency

A&oid eGcessi&e transl)cency

lowers &al)e

restoration is too!reydar?



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Transl)cency

A&oid inade/)ate transl)cency


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Control the En&ironment

1)st s)rro)nd teeth with color that aids

color ercetion

Use ne)tral colors in oeratoryClose (linds

window li!ht dayli!ht

contamination

Co&er (ri!htly8colored clothin!

6o listic?BE. Hewlett, DDS


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Control the En&ironment

Always )se a (i(

Color sace of nat)ral teeth %ran!e

Comliment to oran!e is (l)eUse blueatient (i(s

E. Hewlett, DDS


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Shade Determination

Shade Comm)nication


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*ita Shade +)ide


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*ita Shade +)ide


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Shade Selection w *itaan Classical

. Select h)e first ".

70% will be A

"#N will (e D

#N will (e 2 or C


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*ita 3D81aster Shade +)ide

;ntrod)ced in 5

Reflects distri()tion

of tooth shades in

nat)re

Systematic and equi-distantco&era!e of

the nat)ral toothshade sectr)m

E. Hewlett, DDS


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Desi!n:

$ &al)ele&els


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Desi!n:

3O chromale&els


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Desi!n:


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roced)re

. Select &al)e


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roced)re

. Select &al)e


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roced)re

. Select &al)e


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roced)re

". Select chromafrom

within the selected

&al)e !ro) Use >1@ ta(s from

the selected &al)e

!ro)

Choosin! (etweendil)ted ' sat)rated

E. Hewlett, DDS


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roced)re

3. Select h)efrom

within the selected

&al)e !ro) ;s the nat)ral tooth

more reddish


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2leached shades nowa&aila(le

#1, #1", #13

2leached shadesocc)y the >leftmost@

E. Hewlett, DDS

Sh d S l ti F


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Shade Selection Feys

Use correct en&ironment and li!htin!

Select shade at (e!innin! of a7t.

atient sittin! )ri!ht*iewin! distance P$ in. from teeth

atient7s teethdentist7s eyes at same le&el

E. Hewlett, DDS

Sh d S l ti F


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hoto!rah shade ta(s which match

secific se!ments of teeth

hoto!rah teGt)re6ote secial characteristics

E. Hewlett, DDS

Sh d S l ti F


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Loo? for &ariance (etween !in!i&al,

middle, and incisal thirds of teeth.

hi!her chroma ' oacity

less chroma, hi!her &al)e

hi!h transl)cency,lower &al)e

ima!e from Ch), et al "##4 E. Hewlett, DDS


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hoto!rahs for La(Comm)nication

E. Hewlett, DDS

T t h t h


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TeGt)re hoto!rah

Close8) of anteriors with lens to la(ial

s)rface

Emhasi9es s)rface teGt)re and l)ster

E. Hewlett, DDS

C l h t h


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Color hoto!rah

Close8) of anteriors with lens an!led $8

"#Q to la(ial s)rface

Reflections (o)nce away from camera,

re&ealin! color and characteri9ation

E. Hewlett, DDS

hoto!rahs with Shade Ta(s


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An!le camera to a&oid reflections from ta(

and teeth

Show at least 85 teethTa( at same an!le as teeth

Ta( as close to teeth as ossi(le

E. Hewlett, DDS



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Ta( and handle clearly &isi(le, no

reflections

Shoot as many hotos as necessary

different ta(s for different areas of teeth

E. Hewlett, DDS

hotos for All Ceramic Restorations


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hotos for All8Ceramic Restorations

Shade ta( w teeth (efore rearation

Shade ta( w reared toothteeth

Desired shade


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%ther La( Comm)nication hotos

hotos of ro&isionals

*iews $, , , ' 5 as

indicatedShade hoto of ro&isionals;f restoration doesn7t match, hoto!rah it

in mo)th with ta(s

E. Hewlett, DDS

Di!ital Shade Ta?in! De&ices


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Di!ital Shade8Ta?in! De&ices




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-hat are they

R+2 de&ices, sectrohotometers, orcolorimeters desi!ned or modified for dental

)se




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-hat can they do

ro&ide detailed data on shades in different

9ones of a tooth7s s)rface




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Limitations

6ot relia(le for comleG characteristics

s)(8s)rface color

Transl)cency

TeGt)re effects




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2ottom Line

6%T a relacement for traditional methods

2est )sed as an ADU6CT to traditional

methods and hoto!rahy

+ +


color & shade matching ppt.unlocked (1)

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