DentMat Prelims Exam Lec Flashcards
what are the three factors of oral environment
- temp
- pH
- masticatory force
normal oral temp
32°C - 37°C
neutral pH level
pH 7
incisors average force
155 N
canine average force
208 N
premolar average force
288 N
first molar average force
290 N
second molar average force
800 N
whats the most biocompatible material to our teeth
gold
characteristics of an ideal dental material
- biocompatible
- mechanically stable and durable
- resistant to corrosion
- dimensionally stable
- minimal conduction
- esthetic
- easy to manipulate
- adheres to tissues
- tasteless and odorless
- cleanable and repairable
- cost-effective
classifications of dental materials
- preventive
- restorative
- auxiliary
whats better than cure
prevention
toothpaste other name
dentrifices
the addition f fluoride to water to reduce tooth decay
fluoridation
overexposure to fluoride
fluorosis
what procedure is advisable for newly erupted molars
pit and fissure sealants
classify the material:
pit and fissure sealants
preventive
classify the material:
compomers
preventive
restorative
classify the material:
hybrid ionomer
preventive
restorative
classify the material:
glass ionomer cement
preventive
classify the material:
liners
preventive
restorative
classify the material:
bases
preventive
restorative
classify the material:
composites
preventive
restorative
classify the material:
primers
restorative
classify the material:
bonding agent
restorative
classify the material:
amalgams
restorative
classify the material:
cast metals
restorative
classify the material:
ceramics, metal-ceramics
restorative
classify the material:
denture polymers
restorative
classify the material:
acid-etching solution
auxiliary
classify the material:
impression materials
auxiliary
classify the material:
casting investments
auxiliary
classify the material:
gypsum cast
auxiliary
classify the material:
dental stones, plaster, distone
auxiliary
classify the material:
dental waxes
auxiliary
classify the material:
acrylic resins
auxiliary
finishing and polishing arasives
auxiliary
classify the material:
dental compounds
auxiliary
classify the material:
gutta-percha
auxiliary
dental material classes
- metals
- ceramics
- polymers
- composites
consists of inorganic, silicate glasses, porcelains, or highly crystalline solids heated at high temperature
ceramics
chemical compound consisting of large organic molecules formed by the union of many smaller repeating units
polymers
materials with chemical or covalent bonds
polymers
example of synthetic polymer
nylon
polymer classifications
natural
synthetic
low melting point
soft and not stiff
qualities of composites
insoluble
good tooth-like appearance
insensitive
when was dentistry as a specialty believed to have began
3000 B.C.
when and who carved ivory or bone for the construction of partial dentures that were fastened to natural teeth
700 BC
Etruscans
when and who used implants consisting of seashell segments that were placed in anterior teeth sockets
600 AD
Mayans
surgeon to four kings, used lead or cork for tooth fillings
Ambroise Pare
used cloth fragments to fill the cavities in her teeth
Queen Elizabeth I
who are the four kings that Ambroise Pare served for
King Henry II
Francis II
Charles IX
Henry III
father of modern dentistry
Pierre Fauchard
when did modern dentistry begin
1728
discovered caries and its classifications;
he began the process of standardization
Greene Vardiman Black
ADA year
1928
CSA year
1966
dental products should confirm to appropriate standards or specifications
- serial / lot number
- composition
- physical properties
- biocompatibility
- data covering
international standards
FDI
ISO
properties of dental materials
- physical
- thermal
- electrical
- optical
- mechanical
susceptible to being dissolved
solubility
adsorption + absorption
sorption
natural process where molecules of a gas or liquid adhere to the surface of a solid
adsorption
passage of a substance into the interior of another by solution or penetration
absorption
a molecular or atomic attraction between two contacting surfaces
adhesion
force of molecular attraction between molecules or atoms of the same species
cohesion
a material substrate that is bonded to another material by means of an adhesive
adherend
substance that promotes adhesion
adhesive
process of joining two materials by means of an adhesive agent that solidifies
adhesive bonding
ability of substance to be wet
wettability
the eye is sensitive to what wavelength
400nm(violet) to 700nm(dark red)
a color space that specifies colors based on three properties of color
Munsell Color System
three properties of color
hue
value
chroma
color
hue
lightness
value
saturation
chroma
see through
transparency
blurry
translucency
prevents the passage of light
opacity
what absorbs all light colors
black
what reflects all light colors
white
what absorbs all light, but reflects its own color
blue
objects that appear to be color-matched under one type of light, but may appear different under another type
metamerism
when the material becomes the source of light
fluorescence
three basic forces
tensile force
compressive force
shear force
types of stress
tensile
compressive
shear
flexural
torsional
the deformation or change in dimension an object under stress experiences
strain
stress-strain curves
elastic limit
yield strength
ultimate strength
when the force is removed, the material will come back to its original state;
reversible
elastic phase
material can’t come back to its original state;
irreversible
plastic phase
elastic phase becomes plastic phase
elastic limit
gradual deformation
creep
stress decreases, but there’s already deformation
stress relaxation
ability to be bent without breaking
flexibility
ability to be hammered or compressed plastically into thin sheets without fracture
malleaility
relative ability of a material to elongate plastically under a tensile stress
ductility
easily breakable material
brittleness
subjected to a cycle of stress
fatigue