03b Properties
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Properties of Dental Material Part 2
1
6
Adhesion
2
6
Mechanisms of Adhesion Micromechanical ■ Physical ■ Chemical ■ Molecular entanglement ■
Combinations as in acid etching then bond application
3
6
Wetting Adhesion depends on Wetting e.g mercury vs fissure sealants.
nonwetting
partial wetting
complete wetting
4
6
Marginal Seal
5
6
Microleakage
Prevention of microleakage or percolation
6
6
Esthetic properties
Colour
Vision
Light source
Object surface and body
Background
Adjacent Scene
7
an object
6
The physical properties of the object The nature of the incident light in which the object is viewed The relationship or close association to other colored objects The color background of the viewer
8
Light Source
6
Colour
9
6
Fluorescence
Natural teeth do under UV
10
6
Light in the Dental Office
Most common lighting is either:
Incandescent: Incandescent is higher in yellow than blue, and reflected off a light yellow to blue background
Fluorescent: Fluorescent is higher in blue waves
Neither is pure white light
11
6
Object
Colour Object
Refraction
Absorption
Scattering 12
6
Glossiness
Glossiness or Brightness - shining or matt (light reflection)
13
6
Translucency transparent vs. Opaque (light penetration vs scattered)
14
6
Observer Eye of the observer
Color fatigue (persistence of a complementary color)
Color difference rather than colour description
Color blindness
15
6
Colour 1 Hue (colour type) 2 Chroma (colour intensity) 3 Value (darkness or whiteness)
16
6
Color Vitality Vitality (looks natural) Staining and water sorption
17
6
Metamerism
change of color matching under different light sources
18
6
Measuring color
Shade guide
19
6
Measuring color
Spectrophotometr y
Colorimeters
Measures reflectance at different wave lengths against a standard Measures reflectance at specific colours
Photocolorimetry 20
Other Properties
21
6
Syneresis
Imbibition
e.g. contract or expand by water loss or gain
H2O H2O
22
6
Radiopacity
23
Erosion and Solubility
6
Erosion
Solubility
24
Diffusion
6
leaching of constituents e.g. Plasticizers in denture lining material
25
6
Corrosion
Relation to stress and surface roughness
26
6
27
Chemical properties
6
Tarnish e.g silver
Deposits: calculus, stains, bacteria, plaque, iron, mercury,
Surface films: oxides, sulfides, chlorides
28
Galvanism
6
e.g. amalgam and gold
Gives the metallic taste or electric shock
29
6
Biological properties:
the ability of a material to elicit an appropriate biological response in a specific application Patient Material
Material Function
BIOCOMPATIBILITY Wataha JC 2001 J Prosth Dent;86:203-9 30
6
Biocompatible
Non toxic
Non irritant
Non carcinogenic
Non allergic
Local
Contact dermatitis 31
6
Nickel sensitivity
32
6
Biocompatibility & Dentists
Patient Safety Dental staff safety Regulatory compliance Legal issues
33
6
Assessing Biocompatibility In vitro tests In vivo/Usage tests Clinical Trials
Eastman Dental Institute for Oral Health Care Sciences 34
Thank you
35
6
References NAME
AUTHORS
PUBLICATION COMPANY
Clinical experience, Assistant professor, Prosthodontics
Dr Layla AbuNaba'a BDS, PhD, MFDRCS
Jordan university of Science and Technology
Philips Science of Dental Materials
Kenneth J.Anusavice
Saunders Publications
Dental Materials and Their Selection
William J. Obrien
Applied Dental Materials Dental Materials. Clinical Applications for Dental Assistants and Dental Hygienists Tooth-Colored Restoratives, Principles and Techniques
J.F. McCabe
Principles of Biocompatibility for Dental Practitioners
Dr. Vehid Salih
Esthetic Colour Training in Dentistry
RD Paravina et al
CD. Hatrick et al HF. Albers
Quintessense Books Blackwell Scientific Saunders Publications Bc Decker Inc
ED
C ODE
2006 11
2003
3
2002
8
1
2003
9
2002
Eastman Dental Institute for Oral Health Care Sciences
Mosby
YEAR
2005 1
2004
36
1
6
Adhesion
2
6
Mechanisms of Adhesion Micromechanical ■ Physical ■ Chemical ■ Molecular entanglement ■
Combinations as in acid etching then bond application
3
6
Wetting Adhesion depends on Wetting e.g mercury vs fissure sealants.
nonwetting
partial wetting
complete wetting
4
6
Marginal Seal
5
6
Microleakage
Prevention of microleakage or percolation
6
6
Esthetic properties
Colour
Vision
Light source
Object surface and body
Background
Adjacent Scene
7
an object
6
The physical properties of the object The nature of the incident light in which the object is viewed The relationship or close association to other colored objects The color background of the viewer
8
Light Source
6
Colour
9
6
Fluorescence
Natural teeth do under UV
10
6
Light in the Dental Office
Most common lighting is either:
Incandescent: Incandescent is higher in yellow than blue, and reflected off a light yellow to blue background
Fluorescent: Fluorescent is higher in blue waves
Neither is pure white light
11
6
Object
Colour Object
Refraction
Absorption
Scattering 12
6
Glossiness
Glossiness or Brightness - shining or matt (light reflection)
13
6
Translucency transparent vs. Opaque (light penetration vs scattered)
14
6
Observer Eye of the observer
Color fatigue (persistence of a complementary color)
Color difference rather than colour description
Color blindness
15
6
Colour 1 Hue (colour type) 2 Chroma (colour intensity) 3 Value (darkness or whiteness)
16
6
Color Vitality Vitality (looks natural) Staining and water sorption
17
6
Metamerism
change of color matching under different light sources
18
6
Measuring color
Shade guide
19
6
Measuring color
Spectrophotometr y
Colorimeters
Measures reflectance at different wave lengths against a standard Measures reflectance at specific colours
Photocolorimetry 20
Other Properties
21
6
Syneresis
Imbibition
e.g. contract or expand by water loss or gain
H2O H2O
22
6
Radiopacity
23
Erosion and Solubility
6
Erosion
Solubility
24
Diffusion
6
leaching of constituents e.g. Plasticizers in denture lining material
25
6
Corrosion
Relation to stress and surface roughness
26
6
27
Chemical properties
6
Tarnish e.g silver
Deposits: calculus, stains, bacteria, plaque, iron, mercury,
Surface films: oxides, sulfides, chlorides
28
Galvanism
6
e.g. amalgam and gold
Gives the metallic taste or electric shock
29
6
Biological properties:
the ability of a material to elicit an appropriate biological response in a specific application Patient Material
Material Function
BIOCOMPATIBILITY Wataha JC 2001 J Prosth Dent;86:203-9 30
6
Biocompatible
Non toxic
Non irritant
Non carcinogenic
Non allergic
Local
Contact dermatitis 31
6
Nickel sensitivity
32
6
Biocompatibility & Dentists
Patient Safety Dental staff safety Regulatory compliance Legal issues
33
6
Assessing Biocompatibility In vitro tests In vivo/Usage tests Clinical Trials
Eastman Dental Institute for Oral Health Care Sciences 34
Thank you
35
6
References NAME
AUTHORS
PUBLICATION COMPANY
Clinical experience, Assistant professor, Prosthodontics
Dr Layla AbuNaba'a BDS, PhD, MFDRCS
Jordan university of Science and Technology
Philips Science of Dental Materials
Kenneth J.Anusavice
Saunders Publications
Dental Materials and Their Selection
William J. Obrien
Applied Dental Materials Dental Materials. Clinical Applications for Dental Assistants and Dental Hygienists Tooth-Colored Restoratives, Principles and Techniques
J.F. McCabe
Principles of Biocompatibility for Dental Practitioners
Dr. Vehid Salih
Esthetic Colour Training in Dentistry
RD Paravina et al
CD. Hatrick et al HF. Albers
Quintessense Books Blackwell Scientific Saunders Publications Bc Decker Inc
ED
C ODE
2006 11
2003
3
2002
8
1
2003
9
2002
Eastman Dental Institute for Oral Health Care Sciences
Mosby
YEAR
2005 1
2004
36
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