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what is it called when two atoms + and - share electrons in the outer shell completely fulling the shell making for a very strong bond
covalent
what kind of bond does teracylcine staining form?
covalent bond
what is two examples of weak bonds, the atoms do not share electrons
hydrogen bonds
van der Vaals bonds
what five ways are materials classified by?
physical structure
application
manipulation
composition
reaction
what is known as young's elastic modulus?
stiffness
inability to bend
stiffness
what has volume but no shape?
liquids
______=flow easier under mechanical force
thixotropic
what is an example of tixotropic
seating a crown-having the pt bite down
what are two things that would be classified as preventative?
fluoride
pit and fissure sealants
what are three examples of things that would be classified as therapeutic
mediated bases
periodontal disease topicals
orapix (?)
what is the largest classification of materials?
restorative
what are two categories of the restorative classification? give examples of both
direct-amalgam and composite
indirect-porcelain fused to metal crown
what are two reactions from combining two components?
physical-evaporation or cooling of liquid
chemical-catalyst+base
what are the two stages that happen when combining two components?
manipulation stage
reaction stage
what is the manipulation stage of combining two components
mixing time-components homogenous
working time-manipulate material in mouth
what is the reaction stage of combining two components?
initial set time-no longer able to manipulate
final set time-ultimate state
______ control is critical if contamination occurs = ______
moisture
failure
t/f postoperative instructions to the patient are critical
True
False
true
t/f the material must not be disturbed through the end of the final set
True
False
false
t/f moisture and pressure controls are frequently important during the initial set
True
False
true
t/f the final set always occurs while the pt is still in the dental office
True
False
false
t/f once a material has reached the initial set, it will not fracture
True
False
false
what instructions should you follow when manipulating dental materials
manufactures instructions
t/f all dental materials should be kept in a warm, dry location
True
False
false- refer to manufactures recommendations for storage
Author
cassiedh
ID
63741
Card Set
Dental Materials
Description
ch 3 physical properties of dental materials
Updated
2011-02-03T01:59:42Z
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