dental materials,
as stress increase - ANSWER-strain decrease
can a product go out in the market eve if FDA didn't approve? - ANSWER-yes it can
coefficient of thermal expansion - ANSWER-the change in length on and object due to an increase or
decrease in its temperature
define brittleness - ANSWER-a materials ultimate strength is almost equal to tis elastic limit
define standards - ANSWER-describe properties of product so user can select proper material for certain
use
define tarnish - ANSWER-deterioration that only occurs on the surface of a metal causing discoloration
how do ceramic appear on radiographs? - ANSWER-radiolucent
how does temperature flow through metals? - ANSWER-very quickly and easily
how is resilience determined? - ANSWER-calculating the area under the linear or elastic portion of the
stress-strain curve ; mouthguard
how is toughness determined? - ANSWER-calculating the total area under the stress-strain curve ; crash
helmet
how to metals appear on radiographs? - ANSWER-radiopaque
is a poor conductor a good insulator or a bad insulator? - ANSWER-a good insulator
is corrosion reversible? - ANSWER-no
is tarnish reversible? - ANSWER-yes
is wax a very good conductor or a very poor conductor? - ANSWER-very poor conductor
percolation - ANSWER-movement of saliva in and out of the tooth/ restoration interface because of
changes in coefficients of thermal expansion
the greater the percent elongation= - ANSWER-=the greater the ductility
thermal conductivity - ANSWER-a rate at which heat flows through a material
weak bond= - ANSWER-=weak material
what are biologic properties? - ANSWER-effects on living tissues
what are biomaterials? - ANSWER-man made materials that are used to replace tissues or that function
in intimate contact with living tissue
what are chemical properties? - ANSWER-setting reactions; the way it decays and degrades
what are composites? - ANSWER-a material made from 2 or more materials, which creates a strong and
lightweight material
, dental materials,
what are covalent bonds? - ANSWER-long chains
what are examples fo metals? - ANSWER-gold, amalgam, stainless steel, titanium
what are examples of ceramics? - ANSWER-porcelain, glass, quartz, silica
what are examples of polymers and plastics? - ANSWER-plastics, acrylic, unfilled resin sealants
what are ideal characteristics for a dental material? - ANSWER-strong, biocompatible, aesthetics
what are materials that make up a composite called? - ANSWER-PHASE
what are mechanical properties? - ANSWER-ability to resist force dependent upon amount of material
and shape of object; strength
what are physical property? - ANSWER-laws of physics; mass, energy, force, light, heat and electricity
what are the categories for a primary bond based material? - ANSWER-metals, ceramics, polymers and
plastics, composites
what are the properties of materials? - ANSWER-physical, mechanical, chemical, biologic
what are the results of micro leakage? - ANSWER-increase staining and discoloration along margins of
restorations, recurrent caries, pulpal irritation/ immflamuation resulting in sensitivity
what are thermal properties? - ANSWER-measurement dependent upon distance heat travels, the area
in which it travels and temperature difference between source and definition
what are vanderwaals forces? - ANSWER-result of partial charges from uneven distribution of electrons
what can be bent without breaking yet retains strength? - ANSWER-metals
what can cause galvanism? - ANSWER-crowns and amalgams
what causes micro leakage? - ANSWER-when a tooth and a restoration have different linear coefficients
of thermal expansion and expand and contract at different rates and different amounts
what conduct temperature poorly? - ANSWER-nonmetals
what conducts temperature well? - ANSWER-metals, especially gold
what do atoms have to do with dental materials? - ANSWER-atoms and the way they are bonded
determine the properties of that material
what do council of scientific affairs of ADA evaluate? - ANSWER-drugs, materials, instruments, and
equipment
what does dentin act as? - ANSWER-acts as a natural insulator
what does elastic modulus do? - ANSWER-predicts how much a material will resits bending
what does it mean when a material easily breaks/fractures under tensile force? - ANSWER-the material
has low ductility and is considered brittle
as stress increase - ANSWER-strain decrease
can a product go out in the market eve if FDA didn't approve? - ANSWER-yes it can
coefficient of thermal expansion - ANSWER-the change in length on and object due to an increase or
decrease in its temperature
define brittleness - ANSWER-a materials ultimate strength is almost equal to tis elastic limit
define standards - ANSWER-describe properties of product so user can select proper material for certain
use
define tarnish - ANSWER-deterioration that only occurs on the surface of a metal causing discoloration
how do ceramic appear on radiographs? - ANSWER-radiolucent
how does temperature flow through metals? - ANSWER-very quickly and easily
how is resilience determined? - ANSWER-calculating the area under the linear or elastic portion of the
stress-strain curve ; mouthguard
how is toughness determined? - ANSWER-calculating the total area under the stress-strain curve ; crash
helmet
how to metals appear on radiographs? - ANSWER-radiopaque
is a poor conductor a good insulator or a bad insulator? - ANSWER-a good insulator
is corrosion reversible? - ANSWER-no
is tarnish reversible? - ANSWER-yes
is wax a very good conductor or a very poor conductor? - ANSWER-very poor conductor
percolation - ANSWER-movement of saliva in and out of the tooth/ restoration interface because of
changes in coefficients of thermal expansion
the greater the percent elongation= - ANSWER-=the greater the ductility
thermal conductivity - ANSWER-a rate at which heat flows through a material
weak bond= - ANSWER-=weak material
what are biologic properties? - ANSWER-effects on living tissues
what are biomaterials? - ANSWER-man made materials that are used to replace tissues or that function
in intimate contact with living tissue
what are chemical properties? - ANSWER-setting reactions; the way it decays and degrades
what are composites? - ANSWER-a material made from 2 or more materials, which creates a strong and
lightweight material
, dental materials,
what are covalent bonds? - ANSWER-long chains
what are examples fo metals? - ANSWER-gold, amalgam, stainless steel, titanium
what are examples of ceramics? - ANSWER-porcelain, glass, quartz, silica
what are examples of polymers and plastics? - ANSWER-plastics, acrylic, unfilled resin sealants
what are ideal characteristics for a dental material? - ANSWER-strong, biocompatible, aesthetics
what are materials that make up a composite called? - ANSWER-PHASE
what are mechanical properties? - ANSWER-ability to resist force dependent upon amount of material
and shape of object; strength
what are physical property? - ANSWER-laws of physics; mass, energy, force, light, heat and electricity
what are the categories for a primary bond based material? - ANSWER-metals, ceramics, polymers and
plastics, composites
what are the properties of materials? - ANSWER-physical, mechanical, chemical, biologic
what are the results of micro leakage? - ANSWER-increase staining and discoloration along margins of
restorations, recurrent caries, pulpal irritation/ immflamuation resulting in sensitivity
what are thermal properties? - ANSWER-measurement dependent upon distance heat travels, the area
in which it travels and temperature difference between source and definition
what are vanderwaals forces? - ANSWER-result of partial charges from uneven distribution of electrons
what can be bent without breaking yet retains strength? - ANSWER-metals
what can cause galvanism? - ANSWER-crowns and amalgams
what causes micro leakage? - ANSWER-when a tooth and a restoration have different linear coefficients
of thermal expansion and expand and contract at different rates and different amounts
what conduct temperature poorly? - ANSWER-nonmetals
what conducts temperature well? - ANSWER-metals, especially gold
what do atoms have to do with dental materials? - ANSWER-atoms and the way they are bonded
determine the properties of that material
what do council of scientific affairs of ADA evaluate? - ANSWER-drugs, materials, instruments, and
equipment
what does dentin act as? - ANSWER-acts as a natural insulator
what does elastic modulus do? - ANSWER-predicts how much a material will resits bending
what does it mean when a material easily breaks/fractures under tensile force? - ANSWER-the material
has low ductility and is considered brittle
