This document provides an overview of shade selection in esthetic dentistry. It discusses key aspects of color such as hue, value, chroma. It describes color mixing systems and color measurement systems like Munsell and CIE LAB. Factors that influence tooth color like translucency, fluorescence and surface appearance are covered. Techniques for shade selection including visual guides like Vita Classical and 3D Master as well as instrumental methods like spectrophotometers are summarized. Considerations for using shade guides and limitations of digital techniques are also mentioned. The document concludes with information on custom shade guides that can be made using micrometers or molds.
Accurate shade selection that allows restorations to match the natural dentition positively influences the patients appearance and esthetic self-esteem.
Patients are demanding contemporary esthetic dentistry, which has prompted the industry to continuously raise the bar with regard to esthetic detail
Major challenges in cosmetic dentistry are to accomplish appropriate and satisfactory reproduction of natural shade of teeth.1
The kind of shade guide, individual ability to choose shades and conditions the choice is made under, all have influence on reliability and accuracy of the procedure.
Shade selection in dental practice is an important but difficult task.
Dentists are challenged to satisfy the aesthetic requirement of patients when they select the shades for fabrication of prosthesis. Most dentists are usually not trained for shade selection.2
Colour and Shade Selection in dental practiseSNEHA RATNANI
Shade selection is an extremely important aspect of aesthetic dentistry.One must have thorough knowledge of colour and shade selection before carrying out any restorative procedures in patients mouth. A brief seminar on colour and shade selection has been penned down here. Hope it helps u fetch some information regarding shade selection and colour in dentistry.
Being Prosthodontists, we deal with restorative dentistry. Restorative dentistry is a blend of science and art. Aesthetics which is one of the main concerns in restorative dentistry depends totally upon the proper shade matching of prosthesis with surrounding structures, which can be teeth or soft tissues.
Color matching is done, for better compliance.
Perception of color is a physiological response by human eyes and sensory structures of the brain towards the light reflected from an object.
Accurate shade selection that allows restorations to match the natural dentition positively influences the patients appearance and esthetic self-esteem.
Patients are demanding contemporary esthetic dentistry, which has prompted the industry to continuously raise the bar with regard to esthetic detail
Major challenges in cosmetic dentistry are to accomplish appropriate and satisfactory reproduction of natural shade of teeth.1
The kind of shade guide, individual ability to choose shades and conditions the choice is made under, all have influence on reliability and accuracy of the procedure.
Shade selection in dental practice is an important but difficult task.
Dentists are challenged to satisfy the aesthetic requirement of patients when they select the shades for fabrication of prosthesis. Most dentists are usually not trained for shade selection.2
Colour and Shade Selection in dental practiseSNEHA RATNANI
Shade selection is an extremely important aspect of aesthetic dentistry.One must have thorough knowledge of colour and shade selection before carrying out any restorative procedures in patients mouth. A brief seminar on colour and shade selection has been penned down here. Hope it helps u fetch some information regarding shade selection and colour in dentistry.
Being Prosthodontists, we deal with restorative dentistry. Restorative dentistry is a blend of science and art. Aesthetics which is one of the main concerns in restorative dentistry depends totally upon the proper shade matching of prosthesis with surrounding structures, which can be teeth or soft tissues.
Color matching is done, for better compliance.
Perception of color is a physiological response by human eyes and sensory structures of the brain towards the light reflected from an object.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
shade selection seminar
Yasir A. alnakib
supervised by : prof. Dr. ammar A. ali
department of conservative dentistry
college of dentistry
university of al-mustansiriya
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
shade selection seminar
Yasir A. alnakib
supervised by : prof. Dr. ammar A. ali
department of conservative dentistry
college of dentistry
university of al-mustansiriya
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Color of Natural Teeth and shade selection in dentistry.Keerat Kuckreja
Shade selection in dentistry.
Hue, Chroma, Value.
Munsell color system, CIELAB color system.
Optical characteristics of natural teeth
shade matching.
illumination and sources.
VITA shade guide.
Indian Dental Academy: will be one of the most relevant and exciting training
center with best faculty and flexible training programs for dental
professionals who wish to advance in their dental practice,Offers certified
courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry,
Prosthetic Dentistry, Periodontics and General Dentistry.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
offering a wide range of dental certified courses in different formats.for more details please visit
www.indiandentalacademy.com
An overview of color vision with its Theories , mechanism and important concepts. Brief explanation on color vision disorders and tests use for screening and diagnosis. by DR.GAGAN and DR. NEENET
OPTICAL PROPERTIES OF DENTAL MATERIALS AND SHADE SELECTIONHri M
This presentation describes the optical properties of dental materials, the different types of colour models, how colour is produced, dimensions of colour, problems in colour perception, shade guides available in markets and rules in shade selection
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
ABDOMINAL TRAUMA in pediatrics part one.drhasanrajab
Abdominal trauma in pediatrics refers to injuries or damage to the abdominal organs in children. It can occur due to various causes such as falls, motor vehicle accidents, sports-related injuries, and physical abuse. Children are more vulnerable to abdominal trauma due to their unique anatomical and physiological characteristics. Signs and symptoms include abdominal pain, tenderness, distension, vomiting, and signs of shock. Diagnosis involves physical examination, imaging studies, and laboratory tests. Management depends on the severity and may involve conservative treatment or surgical intervention. Prevention is crucial in reducing the incidence of abdominal trauma in children.
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
ASA GUIDELINE
NYSORA Guideline
2 Case Reports of Gastric Ultrasound
Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
Basavarajeeyam is a Sreshta Sangraha grantha (Compiled book ), written by Neelkanta kotturu Basavaraja Virachita. It contains 25 Prakaranas, First 24 Chapters related to Rogas& 25th to Rasadravyas.
Knee anatomy and clinical tests 2024.pdfvimalpl1234
This includes all relevant anatomy and clinical tests compiled from standard textbooks, Campbell,netter etc..It is comprehensive and best suited for orthopaedicians and orthopaedic residents.
Local Advanced Lung Cancer: Artificial Intelligence, Synergetics, Complex Sys...Oleg Kshivets
Overall life span (LS) was 1671.7±1721.6 days and cumulative 5YS reached 62.4%, 10 years – 50.4%, 20 years – 44.6%. 94 LCP lived more than 5 years without cancer (LS=2958.6±1723.6 days), 22 – more than 10 years (LS=5571±1841.8 days). 67 LCP died because of LC (LS=471.9±344 days). AT significantly improved 5YS (68% vs. 53.7%) (P=0.028 by log-rank test). Cox modeling displayed that 5YS of LCP significantly depended on: N0-N12, T3-4, blood cell circuit, cell ratio factors (ratio between cancer cells-CC and blood cells subpopulations), LC cell dynamics, recalcification time, heparin tolerance, prothrombin index, protein, AT, procedure type (P=0.000-0.031). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and N0-12 (rank=1), thrombocytes/CC (rank=2), segmented neutrophils/CC (3), eosinophils/CC (4), erythrocytes/CC (5), healthy cells/CC (6), lymphocytes/CC (7), stick neutrophils/CC (8), leucocytes/CC (9), monocytes/CC (10). Correct prediction of 5YS was 100% by neural networks computing (error=0.000; area under ROC curve=1.0).
These lecture slides, by Dr Sidra Arshad, offer a quick overview of the physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar lead (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
6. Describe the flow of current around the heart during the cardiac cycle
7. Discuss the placement and polarity of the leads of electrocardiograph
8. Describe the normal electrocardiograms recorded from the limb leads and explain the physiological basis of the different records that are obtained
9. Define mean electrical vector (axis) of the heart and give the normal range
10. Define the mean QRS vector
11. Describe the axes of leads (hexagonal reference system)
12. Comprehend the vectorial analysis of the normal ECG
13. Determine the mean electrical axis of the ventricular QRS and appreciate the mean axis deviation
14. Explain the concepts of current of injury, J point, and their significance
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. Chapter 3, Cardiology Explained, https://www.ncbi.nlm.nih.gov/books/NBK2214/
7. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
- Video recording of this lecture in English language: https://youtu.be/kqbnxVAZs-0
- Video recording of this lecture in Arabic language: https://youtu.be/SINlygW1Mpc
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
Basavarajeeyam is an important text for ayurvedic physician belonging to andhra pradehs. It is a popular compendium in various parts of our country as well as in andhra pradesh. The content of the text was presented in sanskrit and telugu language (Bilingual). One of the most famous book in ayurvedic pharmaceutics and therapeutics. This book contains 25 chapters called as prakaranas. Many rasaoushadis were explained, pioneer of dhatu druti, nadi pareeksha, mutra pareeksha etc. Belongs to the period of 15-16 century. New diseases like upadamsha, phiranga rogas are explained.
2. SHADE SELECTION IN
ESTHETIC DENTISTRY
Dr. Sourav Kirtania
MDS PGT
Department of Conservative Dentistry and Endodontics
3. Contents
– Introduction
– Colour
– Classification of colour
– Light
– Visible spectrum of light
– Color mixing - additive and subtractive
– Munsell color system
– Value
– Hue chroma
– CEILAB color system
– Eye and color perception
– Shade selection principles
– Optical characteristic of natural tooth
– Translucency
– Fluorescence
– Opalescence
– Influence of surface apperance
– Metamerism
– Simultaneous contrast
– Actual contrast
– Spatial contrast
– Measurement of colour
– Visual technique - shade guides
– Protocols for using shade guides
– Vita classical shade guide
– Instructions to use vita classical shade
guide
– Vita 3d master shade guide
4. Contents
– Instructions to use vita 3d shade guide
– Chromascop shade guide
– Dentin and extended shade guides
– Value vs hue based shade guides
– Merits and demerits of shade guide
– Instrumental technique for shade
selection
– Spectrophotometers and
spectroradiometers
– Colorimeters
– Digital cameras and imaging system
– Hybrid devices
– Restrictions of digital shade guide
– Custom made shade guide
– Self made shade guide - using
micrometer
– Self made shade guide - using
prefabricated mold
– Composite buttons
– Recommended protocols for clinical
shade selection
– Work site lightning
– Environment
– Condition of teeth
– Position of patient and timing
– Factors affecting shade selection
– Age
– Gender
– Eye color
6. Introduction
– “Color is unimportant to the physiological success of dental restoration, yet it
could be the controlling factor in overall acceptance by the patient”
- Billmayer and Saltzman
7. Colour
Philips 12th Edition,
– Color - Sensation induced from light of varying wavelengths reaching the eye.
– Color scientists have defined the three basic dimensions, or colorimetric
properties, of color characterization as hue, saturation/chroma, and lightness
(Tristimulus data)
9. Light
Visible
electromagnetic
energy
Visible spectrum
360-750 nm
Prism breaks it into
component
wavelengths (color)
Light isn’t just what we can see, light can be broken up into
different types and we call the whole family the
electromagnetic spectrum
So even when it’s dark, light is still around us
Light can be made by making an electron oscillate, this creates
an oscillating magnetic field and an electric field which we call
an electromagnetic wave or light.
We often represent light as a wave. It has a wavelength, a
frequency and speed.
11. Colour mixing – additive
and substractive
– Additive system:
– Primary colors: Red, Green and Blue
White
Red
Blue
Green
Black
Cyan
Magenta
Yellow
– Subtractive system:
– Secondary colors: cyan, magenta and yellow
There are two types of colour mixing system. Human eyes can see
three basic colors – red, green and blue. Together in equal
proportions they make white color. This color mixing principle is used
in screens of tv, monitor and phones. But if we focus on the colors
produced by mixing two of the basic colors, which is known as the
secondary colors and mixing those resulting three colors, it gives
black.
12. Munsell colour system
– Munsell colour theory is based
on a three-dimensional model
– Each color is comprised of three
attributes of hue (color itself),
value (lightness/darkness) and
chroma (color saturation or
brilliance)
13. Value
– Value is the darkness or lightness of a colour
– Scale ranges from 0-10
– More important than chroma or hue
15. Hue
– The dominant color of an object is called hue
that is represented on a circular scale.
16. CEILAB colour system
– CIE: Commission Internationale d’Eclairage,
✓ Devised a mathematical model for the purpose of numerically
describing all color visible to the human eye: CIE XYZ Color Space.
✓ CIE LAB (L*a*b*) - successive more refined colorimetric systems for
the measurement and specification of color.
✓ Published in 1976 by the International Commission on Illumination
✓ Coordinates of CIELAB - L*a*b* but Colour system is informally
referred to - L-a-b.
✓ CIELAB - system to triangulate and precisely define and specify any
color reference point within the theoretical sphere containing all
visible color
17. CEILAB colour system
– In 3D model,
• Chromatic a* axis extends from green (-a*) to
red (+a*)
• Chromatic b* axis extends from blue (-b*) to
yellow (+b*)
• Lightness dimension = L* = ranges from 0 (pure
black) to 100 (diffuse white).
• Point at which the a* and b* axes cross, at the L*
value of 50, is pure, balanced, neutral gray
Visible gamut within
CIELAB color space D65
whitepoint mesh
18. Eye and colour perception (Rods
and Cones)
Rods
• Located more at
periphery
• Few at center
• Activated more in
low light
• Perceive value but
not chroma/hue
• Called scotopic
vision
Cones
• Concentrated near
center
• Principal mediators
of color
• Function in only
higher light levels
• Called photopic
vision
19. Optical characteristic of natural
tooth
Translucency Fluorescence Opalescence Metamerism Surface gloss
Influence of
surface
appearance
21. Fluorescence
– It is a type of luminescence
– Because there is a higher concentration of organic material in
the dentin of a human tooth, this condition predominately
occurs there.
The distal edge of tooth 11 is
restored with composite
The fluorescence intensity of the composite exceeds
the respective parameters of the tooth
22. Opalescence
– Opalescence is the optical property of a material in which it seems to be of one
color upon the reflection of light, while on transmission of light, it appears to be
another color.
24. Metamerism
– When two colors appear to match under specific lighting conditions yet have
differing shadow-like reflectances, known as metamers, the phenomenon is
known as metamerism, and the entire process is considered to be metamerism.
25. Simultaneous contrast
– Light and dark contrasts can be correlated
to the surrounding environment like skin
tone, hair color, and brightness of adjacent
soft tissues
– Brighter shade should be selected for light
tone patients and darker shades for
pigmented toned patients
Same shade is perceived differently due to inflamed gingiva
26. Actual contrast
– Influenced by size and chroma
– Brighter tooth looks larger while darker tooth of same
dimension looks smaller
27. Spatial contrast
– It is discerned when the tooth is observed in different
positional planes
– Recessed tooth looks darker while overlapping tooth
appears brighter
28. Shade selection principles
Full spectrum of light is needed to elicit all the color a tooth is capable of reflecting
“summers noon with clear sky daylight”
Standardized light source required that resembles natural daylight
C.R.I >90 ideal & Color temperature 5500K
Light source should have a near UV component
Intensity of light should be comfortable to eyes
Neutral grey suggested for was, staffs, clothing and patient drape
30. Visual technique – shade guides
Shade
guides
Composite
Acrylic
based
Ceramic
Vita classical
Vita tooth guide or 3D
master
Chromascope
Based on
Munsell
color
system
31. Protocols for using visual shade
guides
– Make sure to perform the test under neutral light, ideally in daylight.
– Try and use a neutral environment, avoiding make-up, lipstick, and brightly
coloured clothing.
– Choose quickly: in case of doubt, always prefer the first option because after 5
to 7 seconds, the eye gets tired.
– Perform this test before preparation because the color of the tooth after
dehydrogenation becomes too white.
– Consider adjacent teeth and their color.
– Disinfect the colour chart before and after each use
32. Vita classical shade guide
– Color space is
defined into four
groups
A
Red &
brown
B
Red &
yellow
C
Grey
D
Red &
grey
– Chroma is
designated with
numerical values
– Comprise
leading
HUE (name
of colour)
33. Instructions to use the vita
classical shade guide
– Determine the tooth shade before
preparation, since after preparation the
tooth appears lighter due to dehydration
– Determine the tooth shade preferably in
natural daylight or using standardized
daylight lamps (5500K – 6500K) and not
under typical indoor lighting conditions.
– The surrounding area should be as color
neutral as possible. Remove influencing
lipstick or cosmetics and cover up strong
colored clothes with a gray cape
– Hold the shade sample tooth as close to
the patient’s tooth as possible
https://www.vita-zahnfabrik.com/pdb_GG1G10G100_en.html
34. Vita 3D master shade guide
– 26 tabs
– 5 groups
vertical in relation to chroma and
horizontal axes according to hue
First
group
Two tabs
Rest
Seven tabs
Every
shade
tab
• 3 markers (1-5)
• Level of value
35. Vita 3D master shade guide
There is an extensive range of value
The red spectra are wide-ranging
The shade tabs are more correspondingly divided into the color space
The development in distribution of groups has improved and become
more concise
36. Instructions to use the Vita 3D shade guide
https://www.globaldentalso
lutions.com/wp-
content/uploads/2018/05/V
ITA_961_961E_Toothguide_
BA_EN_V03_screen_en.pdf
37. Instructions to use the Vita 3D shade guide
https://www.globaldentalso
lutions.com/wp-
content/uploads/2018/05/V
ITA_961_961E_Toothguide_
BA_EN_V03_screen_en.pdf
38. Instructions to use the Vita 3D shade guide
https://www.globaldentalso
lutions.com/wp-
content/uploads/2018/05/V
ITA_961_961E_Toothguide_
BA_EN_V03_screen_en.pdf
40. Dentin and Extended Shade
Guides
– Dentin system can be used for the fabrication of
translucent all-ceramic crowns and veneers
– Specially colored die materials corresponding to the
dentin shade are used, which allows the technician to
appraise the esthetics of the restoration
2022 Alnusayri et al. Cureus 14(3): e23331.
41. Value-based versus Hue-based
Shade Guides
– Value-based shade guides are a more accurate
means of shade selection, since our eyes are more
sensitive to changes in lightness/darkness and
chroma than subtle changes in hue
– Examining a B1 versus A1 shade tab, it would be
difficult to assess which tab contains more yellow or
orange; however, it is relatively easy to determine
which tab is brighter (value)
Science and art of porcelain laminate veneers, Galip Gurel
42. The importance of Stump Shade
– Through communication about color tone, dental labs can
create the best translucency effect, especially when there
is a porcelain jacket or pressed material involved.
– This is why it is so important to communicate the stump or
preparation shade for every all-porcelain restoration as
well as every Zircon structure
– The lab technician can use this information to make a
model die that is the same shade as the preparation and
make sure there is no show-through or shade change to
the ceramic from the underlying tooth structure.
https://bayshoredentalstudio.com/importance-of-stump-shade/
43. Merits of shade guide
The most common method of shade selection is using a visual shade guide
It is economical and durable, i.e., does not require frequent replacement of the
shade guide.
It provides an efficient comparison with natural tooth color.
Most frequently used by dentists, dental assistants and dental laboratory
technicians to communicate the proper tooth color, brightness and translucency
Easily available
44. Demerits of shade guide
In shade guides, the colors may differ for each company.
Porcelain that is used for restoration of teeth may be different with a shade guide.
Guides are not able to direct the manufacturing of porcelain restoration.
The shades of a tooth in a shade guide are not rationally arranged and do not
cover the capacity of color space that is normally unoccupied in natural teeth.
A normal shade tab is prepared from synthetic resin having greater density than a
crown.
A shade guide tab reflects and transforms light-forming translucency and provides
a look of vitality
45. Instrumental Techniques in Tooth
Shade Selection – Spectrophotometers
and Spectroradiometers
VITA Easyshade® V Spectrophotometer
A spectrophotometer is an instrument that supports spectrophotometry to measure the amount of
light intensity absorbed after passing through a sample solution.
46. Colorimeters
– Colorimeter presents a complete measurement of light absorbed
– Colorimeters record tri-stimulus values and filter light in red, green
and blue regions of the visible spectrum
– Colorimeters are not capable of recording spectral reflectance and
their accuracy can be diminished because of over usage
Rajan, N. ., Krishna S, R. ., Rajan, A. ., Singh, G. ., & Jindal, L. . (2020). Shade
Selection – Basic for Esthetic Dentistry: Literature Review. International
Journal of Contemporary Research and Review, 11(09).
47. Digital Cameras and
Imaging Systems
– Digital cameras show the most basic method for electronic
shade measurement
– The quality of the camera and image-processing method
affects its precision and accuracy
Rajan, N. ., Krishna S, R. ., Rajan, A. ., Singh, G. ., & Jindal, L. . (2020). Shade
Selection – Basic for Esthetic Dentistry: Literature Review. International
Journal of Contemporary Research and Review, 11(09).
48. Hybrid Devices
– Spectro Shade delivers an amalgamation of digital
imaging as well as spectrophotometric exploration.
– It applies the Clear Match Software System (Hood River,
OR, USA: Smart Technology) and it is a product of
independent hardware, which is developed for use on
PCs that have the Windows platform and virtually any
digital camera
SpectroShade (MHT Optic research)
ClearMatch system
(Smart technology)
Rajan, N. ., Krishna S, R. ., Rajan, A. ., Singh, G. ., & Jindal, L. . (2020). Shade
Selection – Basic for Esthetic Dentistry: Literature Review. International
Journal of Contemporary Research and Review, 11(09).
49. Restrictions of Digital Shade
Guide
The color measurement accurateness is affected due to the loss of power supply.
For all systems, translucent recording is insufficient.
Settlement of the probe or mouthpiece appears to be vital for the
reappearance of the measurement.
No digital shade guide is satisfactorily progressive to function in a mode of
formulation.
The research laboratory must be well equipped with the latest and most updated
systems for the effective use of this process
50. Custom made shade guide
– Self made shade guide, using micrometer
– Self made shade guide, using prefabricated molds
– Composite buttons
51. Self made shade guide (using
micrometer)
– “Self-made” shade guides reflect the need for more reliable commercial ones.
Paolone, Gaetano & Orsini, Giovanna & Manauta, Jordi & devoto, Walter & Putignano, Angelo. (2014).
Composite shade guides and color matching. The international journal of esthetic dentistry. 9. 164-82.
52. Self made shade guide
(prefabricated mold)
Paolone, Gaetano & Orsini, Giovanna & Manauta, Jordi & devoto, Walter & Putignano, Angelo. (2014).
Composite shade guides and color matching. The international journal of esthetic dentistry. 9. 164-82.
53. Composite buttons
– In this technique composite buttons of
different shades are placed on the tooth
surface and cured
– High resolution picture is taken and
visualised in a software (Photoshop,
Lightroom)
– Visualisation in high contrast and black and
white.
Composite shade guides and color matching. The international
journal of esthetic dentistry. 2014. vol 9. 164-82.
54. Recommended Protocols for Clinical
Shade Selection - Working Site Lighting
– Midday sunlight is ideally considered for the best shade selection.
– The exposure of midday sunlight comprises nearly the same blend of whole-
light wavelengths as compared to the sunlight exposure of morning and evening
timings, which are more affluent with reddish and yellow wavelengths
Daylight 6500K
Fluorescent
tube light 5500K
CRI of
95%
Tungsten/
Incandescent
light
2800-
3200K
CRI of
100%
Rite Lite 2
55. Recommended Protocols for Clinical
Shade Selection - Environment
– The ideal backdrop for color matching is a very light shade of
gray.
– Surroundings with bright colors should be evaded as they
affect suitable color matching through influencing the colors
in the reflected light.
– Unwanted colors in the patient’s jewelry and clothing can be
covered with a drape, and the patient’s lipstick should be
removed to prevent any changes in color perception.
– High-gloss surfaces create disturbing shines and should be
avoided
Borse S, Chaware SH. Tooth shade analysis and selection in prosthodontics: A systematic review and meta-analysis. J Indian
Prosthodont Soc. 2020 Apr-Jun;20(2):131-140 Epub 2020 Apr 7. PMID: 32655217; PMCID: PMC7335029.
56. Recommended Protocols for Clinical
Shade Selection - Condition of Teeth
– The tooth to be matched and its neighboring teeth must be free of surface
stains and plaque along with other deposits
– The tooth of interest must be moist with saliva because a lack of moisture will
result in a whiter look
– Color matching of a tooth ought to be done before applying the rubber dam
– Selection of shade should not be executed quickly after bleaching
– During the selection of shade,
– teeth must be distributed into three areas each time, such as gingival area (it
provides perfect measurement of dentinal chroma), middle and incisal area
(where enamel is more dense and differs from translucent to transparent)
57. Distance of the Operator from the Tooth,
Position of the Patient and Timing
– distance from the oral cavity of about 61cm (2 feet) to 183 cm
(6 feet) is preferably considered for the matching of shade.
– The position of a patient on the dental chair should be in such
a way that the teeth of a patient are at the level of the
operator’s eyes.
– Shade selection must be finalized by the operator in the
morning preferably, when eye tiredness is minimal
Borse S, Chaware SH. Tooth shade analysis and selection in prosthodontics: A systematic review and meta-analysis. J Indian
Prosthodont Soc. 2020 Apr-Jun;20(2):131-140 Epub 2020 Apr 7. PMID: 32655217; PMCID: PMC7335029.
58. Factors Affecting
Shade Selection -
Age
– Shade-matching skills become unfavorable due
to aging because the cornea and lens of the eye
yellow with age, conveying a yellow-brown bias
– This change starts at the age of 30; it becomes
more obvious at 50 years of age and has medical
importance after the age of 60.
– After the age of 60, many people face problems
in distinguishing blue and purple colors.
Appl. Sci. 2022, 12, 6841
59. Factors Affecting Shade
Selection - Gender
– It is generally assumed that women recognize color more precisely than men.
Pecho Oscar, Ghinea R, Perez MM, Della Bona A. Influence of Gender on Visual Shade Matching in Dentistry. J Esthet Restor Dent. 2017
Apr;29(2):E15-E23. PMID: 28185440.
Objective: This observational study evaluated the influence of gender on accuracy of VSM
Results: Irrespective of the color difference metric, the most prevalent shade performed by females showed greater
success (50% for CIELAB and100% for IEDE2000(2:1:1)) than males (25% for CIELAB and 50% for CIEDE2000(2:1:1)).
Conclusions: Themost prevalent shade option resultant from VSM performed by females using VC shade guide perfectly
agreed (100% success rate) with measurements from Spectroradiometer and CIEDE2000(2:1:1) color difference metric.
60. Factors Affecting Shade
Selection – Eye color
– Brown-eyed people have more melanin and are
able to absorb ample light and wavelengths,
possibly influencing view but not color acuity.
– Those with less melanocyte cannot absorb as
much light.
Appl. Sci. 2022, 12, 6841
61. Factors Affecting Shade Selection –
color vision problem/color blindness
– Misperceptions exist in different types of color vision:
– Achromatism: Entire shortage of hue sensitivity;
– Dichromatism: Sensitivity to only two major hues,
generally both red and green are not perceived;
– Trichromatism: Sensitivity to all three hues with
abnormality or deficiency in one of the three primary
pigments or colors in the retinal cones
Appl. Sci. 2022, 12, 6841
62. Factors Affecting Shade
Selection – Fatigue
– Fatigued eyes cannot sense color as perfectly as vigilant
eyes.
– Compromised visual sensitivity occurs due to local,
general or mental fatigues.
– Failure in shade selection (managing several patients
necessitating shade evaluation during a single day of work)
can be a main reason for fatigue.
Appl. Sci. 2022, 12, 6841
63. Factors Affecting Shade
Selection – Binocular difference
– Binocular difference is the difference
between the perception of the right and
left eye.
– Positioning of shade tabs below or above,
rather than next to, the tooth of interest
will support the removal fault caused
through binocular difference
Appl. Sci. 2022, 12, 6841
64. Factors Affecting Shade Selection –
environmental influences
– Develop a neutral gray background in order
– Lessen the effect of surrounding colors so as to determine perfect shade match
facial
appearance
make-up
dental
instruments’
reflection
walls
Appl. Sci. 2022, 12, 6841
Rubber dam
65. Conclusion
To provide an esthetic
restoration to the
patient, the dentist
must have a full
understanding of the
science of color and
color perception.
Matching the correct
shade satisfies both
the dentist and
patient and gives a
pleasing appearance
to the patient.
In order to achieve
good esthetics, both
conventional and
digital shade systems
should be employed
during the shade
selection process.
66. References
– Jouhar, R.; Ahmed, M.A.; Khurshid, Z. An Overview of Shade Selection in Clinical
Dentistry. Appl. Sci. 2022, 12, 6841
– Paolone, Gaetano & Orsini, Giovanna & Manauta, Jordi & devoto, Walter &
Putignano, Angelo. (2014). Composite shade guides and color matching. The
international journal of esthetic dentistry. 9. 164-82.
– Rajan, N. ., Krishna S, R. ., Rajan, A. ., Singh, G. ., & Jindal, L. . (2020). Shade Selection
– Basic for Esthetic Dentistry: Literature Review. International Journal of
Contemporary Research and Review, 11(09).
– Paolone, Gaetano & Orsini, Giovanna & Manauta, Jordi & devoto, Walter &
Putignano, Angelo. (2014). Composite shade guides and color matching. The
international journal of esthetic dentistry. 9. 164-82.
67. – Sproull RC. Color matching in dentistry. I. The three-dimensional nature of color. J
Prosthet Dent. 1973 Apr;29(4):416-24. doi: 10.1016/s0022-3913(73)80019-8. PMID:
4511779.
– Wieder S. Custom shade guide system for composite resins. J Esthet Dent. 1990 Jan-
Feb;2(1):10-2. doi: 10.1111/j.1708-8240.1990.tb00596.x. PMID: 2098058.
– Alnusayri MO, Sghaireen MG, Mathew M, Alzarea B, Bandela V. Shade Selection in
Esthetic Dentistry: A Review. Cureus. 2022 Mar 20;14(3):e23331. doi:
10.7759/cureus.23331. PMID: 35464532; PMCID: PMC9015060.
– Ly, Bao & Dyer, Ethan & Feig, Jessica & Chien, Anna & Bino, Sandra. (2020). Research
Techniques Made Simple: Cutaneous Colorimetry: A Reliable Technique for
Objective Skin Color Measurement. The Journal of investigative dermatology. 140. 3-
12.e1. 10.1016/j.jid.2019.11.003.
68. – Esthetic Restorations Based on Translucency and Opacity of Composite Resins. ,
23(2), 73–87. doi:10.1111/j.1708-8240.2010.00392.x
– Shade selection; Basavanna R S, Gohil Chitra, Shivanna Vasundhara; Year : 2013
| Volume: 3 | Issue Number: 1 | Page: 26-31
– https://bayshoredentalstudio.com/importance-of-stump-shade/
– Shade selection; RS Basavanna, Chitra Gohil, Vasundhara Shivanna
Department of Conservative Dentistry and Endodontics, College of Dental
Sciences, Davangere, Karnataka, India; Year : 2013 | Volume : 3 | Issue :
1 | Page : 26-31