DH104 Midterm Review || with Complete Solutions.
Basic History of Dental Materials correct answers -Used as long ago as 600 B.C.
-Spring -like dentures
Sliver paste used by _________ by 659 A.D. correct answers Chinese
1895 ______________ developed 1st viable amalgam correct answers G.V. Black
"Amalgam War" correct answers disagreement over value and safety of amalgam
______________ used for prevention of caries in England in 1874 correct answers Fluoride
Dr. ________________ credited for noting fluorosis in 1901 correct answers Fredrick McKay
MaKay and G.V. Black discovered drinking water in Colorado Spring was a contributing factor
3 classification of dental materials correct answers therapeutic/preventative, restorative, auxilary
Today's approach to dental care correct answers evidence-based
2005 ADA seal of acceptance correct answers consumer products
FDA regulatory authority over: correct answers medical/dental devices
FDI correct answers World Dental Federation
IOS correct answers International Organization for Standardization
Materials must be: correct answers Biocompatible, durable, nonreactive in acid or alkaline,
compatible with other materials, and esthetically pleasing
Masticatory Force correct answers -Normal masticatory force on occlusal surfaces of molars avg
90-200lbs/square inch
-This can increase by as much as 28,000lbs/square inch on a cusp tip or can decrease in the
incisor area
Types of force correct answers compressive, tensile, shearing
Stress and strain correct answers Fatigue failure
Normal pH of saliva correct answers 6.2-7.0
Effects of moisture on different dental materials correct answers -Corrosion
-Tarnish
-Galvanism
, Effects of temperature on dental materials correct answers -Dimensional change
-Coefficient of thermal expantion (CTE)
-Percolation
-Thermal conductivity
2 types of retention correct answers mechanical/chemical
Microleakage correct answers Fluids/microorganisms can penetrate the interface. Can result in
recurrent decay, marginal staining, and post op sensivity
Color - 3 components: Hue correct answers Dominant color of wavelength detected
Color - 3 components: Chroma correct answers Intensity or strength of a color
Color - 3 components: Value correct answers How light or dark a color is
Color of teeth correct answers -Transparent
-Opaque
-Translucency
-Vitality (life-like quality)
Metamerism correct answers color looks different under different light sources
Detection of restorative materials correct answers light, mirror, air
3 forms of Matter correct answers Solid, Liquid, Gas
Solid (primary bond) correct answers Density - measure of weight compared to volume
Hardness - resistance to solid to penetration
Ultimate strength - the max amt of stress a material can withstand w/out breaking
Elasticity - the ability of material to recover its shape after deformation
Stiffness - ability to resist deformation
Resilience - the ability of material to absorb energy w/out perm. deformation
Toughness - teh ability of material to resist fracture
Ductility - dimentional change w/out breaking
Malleability - withstand compressive stress
Liquid correct answers Viscosity
Thixotropic - liquids that flow more easily under mechanical forces
2 types of Bonds correct answers Primary (strongest)
-ionic, covalent, metallic
secondary (weaker)
-Hydrogen (water)
Basic History of Dental Materials correct answers -Used as long ago as 600 B.C.
-Spring -like dentures
Sliver paste used by _________ by 659 A.D. correct answers Chinese
1895 ______________ developed 1st viable amalgam correct answers G.V. Black
"Amalgam War" correct answers disagreement over value and safety of amalgam
______________ used for prevention of caries in England in 1874 correct answers Fluoride
Dr. ________________ credited for noting fluorosis in 1901 correct answers Fredrick McKay
MaKay and G.V. Black discovered drinking water in Colorado Spring was a contributing factor
3 classification of dental materials correct answers therapeutic/preventative, restorative, auxilary
Today's approach to dental care correct answers evidence-based
2005 ADA seal of acceptance correct answers consumer products
FDA regulatory authority over: correct answers medical/dental devices
FDI correct answers World Dental Federation
IOS correct answers International Organization for Standardization
Materials must be: correct answers Biocompatible, durable, nonreactive in acid or alkaline,
compatible with other materials, and esthetically pleasing
Masticatory Force correct answers -Normal masticatory force on occlusal surfaces of molars avg
90-200lbs/square inch
-This can increase by as much as 28,000lbs/square inch on a cusp tip or can decrease in the
incisor area
Types of force correct answers compressive, tensile, shearing
Stress and strain correct answers Fatigue failure
Normal pH of saliva correct answers 6.2-7.0
Effects of moisture on different dental materials correct answers -Corrosion
-Tarnish
-Galvanism
, Effects of temperature on dental materials correct answers -Dimensional change
-Coefficient of thermal expantion (CTE)
-Percolation
-Thermal conductivity
2 types of retention correct answers mechanical/chemical
Microleakage correct answers Fluids/microorganisms can penetrate the interface. Can result in
recurrent decay, marginal staining, and post op sensivity
Color - 3 components: Hue correct answers Dominant color of wavelength detected
Color - 3 components: Chroma correct answers Intensity or strength of a color
Color - 3 components: Value correct answers How light or dark a color is
Color of teeth correct answers -Transparent
-Opaque
-Translucency
-Vitality (life-like quality)
Metamerism correct answers color looks different under different light sources
Detection of restorative materials correct answers light, mirror, air
3 forms of Matter correct answers Solid, Liquid, Gas
Solid (primary bond) correct answers Density - measure of weight compared to volume
Hardness - resistance to solid to penetration
Ultimate strength - the max amt of stress a material can withstand w/out breaking
Elasticity - the ability of material to recover its shape after deformation
Stiffness - ability to resist deformation
Resilience - the ability of material to absorb energy w/out perm. deformation
Toughness - teh ability of material to resist fracture
Ductility - dimentional change w/out breaking
Malleability - withstand compressive stress
Liquid correct answers Viscosity
Thixotropic - liquids that flow more easily under mechanical forces
2 types of Bonds correct answers Primary (strongest)
-ionic, covalent, metallic
secondary (weaker)
-Hydrogen (water)
