specific questions Flashcards by Abigail Cook

exothermal reaction property change in polymerization

temperature increase

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light absorption change property change in polymerization

low translucent

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volume shrinkage property change in polymerization

shrinkage stress

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viscosity increases property change in polymerization

determines working time

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modulus increases?property change in polymerization

hardness and strenght increase

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Cr-Co based metal alloy used for metal ceramic resotration but then peels off.. why?

oxide layer too thick

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stainless steel ortho wires can be strenghened how

heat treating

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co-olymers are characterized by

more than one type of monomer

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T/F authentic stainless steel has nickel

true

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what is considered an interpenetrating proof material?

In-ceram

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dental acrylic monomers are polymerized by? by - prodcuts?

OPENING up the double bonds

NO BY -PRODUCTS
(case for resins, acrylic, and dental composite)

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all ceramic material must be sintered to become stronger?

FALSE

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name single phase materials and multi phase

single

acrylic resin
saline bonding agent

multi

porcelain
in- ceram
amalgam
composite resin

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three important factors for determining physical properties of metals (like strength, ductile, etc)

crystal structure
phase composition
Grain size

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which have nickel which dont?

Ticonium - alot

not - vitalium or noblium

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pressable material like Empress 2 ceramic has imporved mechanical properties primarily because

HIGHER LUCITE CRYSTAL CONTENT than conventional porcelain
SMALLER LUCITE CRYSTAL SIZE than conventional porcelain

12 carat vs 18 vs 24

24 = 100 finess

18 = 750 finess

12 = 500 (50%)

most common used calcium phosphate ceramic as a dentla coating material is?

Hydroxyapetie

what are examples of NOT complete ceramic?

resin composite

2. glass ionomer

phases of porcelain

crystal

2. glass

list noble metals

NOT Co or Ag

porcelain for PFM restoration is composed primarily of

FELDSPAR

PFM restoration usually requires a heat-treatment of the milled ‘core’ before applying porcelain. Purpose?

OXIDE THE METAL

bonding to dentin was a problem for years because?

BISGMA is hydrophobic and dentin contains water

why HA for coating?

1. biocompatible 2. increases compressive strength 3. effects on contact osteogenesis

interpenetrating phase material often has higher fracture toughness values than conventionoal feldspathic porcelain because

1. phases are continues | 2. the phases are bonded to eachother

advantages of dental CAD/CAM systems?

1. single visit | 2. bridge crown inlay and onlay can be fabricated

galvanic corroson may occur when two different alloys are connected electrically ?

YES -- like when have gold next to an amalagam

why choose base metal alloy rather than precious for large cast resorations

1. less expensive | 2. higher modulus (stiffer)

Full contour monolithic zirconia should always be?

POLISHED is answer b. glazed c. left as machined Ideal is polish and glazed if you cannot glaze should at least polish

grain refining metals

In and Ru

solid solution of Cu-Au

Solid solution: >424 C, Random arrangement of atoms in space Material is more malleable and easier to manipulate