The Nature Of Color - Dental Tribune International (Page 3 of 4) in pdf

Science & Research

ENTAL

RIBUNE

Asia Pacific Edition

It would be prudent at this

once grasped, the author submits

tine produces areas of high and

Dentinal tubular architecture,

stage to dispel one of the great

that use of the term “opalescence”

low saturation of opaque color

exhibiting varying diameter, fre-

myths of color matching in the

as opposed to “translucency”

resulting in dentine being prima-

quency and an S-shaped distribu-

natural tooth. Translucency is

would convey a greater under-

rily responsible for the hue and

tion produces areas of dense and

currently one of the “buzzwords”

standing (with significantly less

chroma of the tooth. The scientific

sparse mineralization. The vari-

in aesthetic restorative dentistry

confusion) as to the requirements

literature describes the predomi-

ous micro-anatomical structures,

and clinicians, in their search for

of a particular restoration.

nant hue as being in the yellow-

tubular architecture, combined

the invisible restoration, demand

Physiology of Natural Tooth

red range, but varies in quantifi-

with the overall gross anatomy of

more and more translucency

Color The observed color of a

cation of this as being between

dentine result in areas of differing

from their ceramists. Under-

tooth results from the combined

76% to 86%, with the remaining

refractive indices resulting in a

standing of the previous para-

effects of the interaction of light

percentage leaning towards the

non-homogeneous reflection and

Fig. 18: Typical opalescent effects

graph would surely indicate

with dentine and enamel.

yellow range. Using the Vitapan

scattering of light rays. This re-

showing a blue comb-like halo in the

that the desire is not for more

standard this would describe the

sults in areas of dense opacity and

incisal region and solid white opales-

Dentine Effects

semi-transparency but rather for

hue of teeth as being predomi-

saturation of color giving dentine

cence in the middle third. Note the

band of solid color at the outer edge

more glow and vitality effects, ie,

The

macro-

and

micro-

nantly in the A range with a small

of the “halo” .

opalescence. A small point, but

anatomical structure of the den-

percentage of B shades.

page 12

Fig. 19: Longitudinal section of a cen-

tral incisor. The relationship of the

varying thicknesses of enamel and

dentine is illustrated. The polychro-

matic effects caused by areas of dense

chroma are clearly evident as are the

opalescent areas of dense particulate

matter in the enamel. With thanks to

Micerium and Lorenzo Vanini for per-

mission to use the slide.

Fig. 20: Typical opalescent effects of

enamel. Notice the blue incisal halo

surrounded by a band of opalescent

enamel.An area of intense stain is pres-

ent in the incisal third and the whole

surface is covered with flaky white

opalescence.Notice as well the obvious

polychromatic influence of dentine,

arranged in this instance, in definite

bands of differing chroma.

Translucency & Opacity

Energize your dental business – join IDEM

These are difficult parame-

ters to explain and even more dif-

ficult to quantify.

Opacity Most of the light rays

IDEM is the leading dental trade fair in the entire

Accompanied by a well-established conference,

are reflected or absorbed due to

Asia-Pacific region. Held at the same time and in the

IDEM is the top expert forum and centre of excel-

the presence of dense particulate

matter within the object.

same place every two years, it stands for continuity

lence for dental medicine and dental technology.

Transparency Most of the

and professionalism at the highest level. This is where

Join us at IDEM 2006! You’ll meet the key decision-

light rays are transmitted due to

the object being mainly devoid of

the products on the global market are brought to-

makers, strengthen valuable contacts with customers

particulate matter.

Translucency Light rays are

gether with the lucrative demand of the dynamically

and partners and exploit the potential harboured by

both transmitted and reflected

growing dental sector in Asia-Pacific.

an exciting growth market.

due to the presence of discrete

minute particles in the object.

A translucent material, by

Endorsed by

Held in

definition, must have particulate

matter embedded that when

struck by light reflects and scat-

ters the rays. In natural teeth,

these particles (owing to their

Koelnmesse, Inc.

minute irregular size and shape)

Cologne International Trade Fairs

primarily reflect the shorter

8700 W. Bryn Mawr

wavelengths (ie, blue wave-

Suite 640 North · Chicago, IL 60631

length). When struck by light

Tel: 773-326-9925 · Fax: 773-714-0063

these particles have the property

Singapore Dental Association

of imparting a “glow” or “vitality”

to the tooth, ie, opalescence.

The Nature Of Color - Dental Tribune International Page 3

Related Articles

Related forms

Related Categories