interum restorations

Question 1

interim restorations

Answer 1

fixed or removal dental prostheis diesgned for esthetics, stability or fucntion for a limited time to be replated by a definitive dental or maxillofacial prosthesis

Question 2

side use of an interim restoration

Answer 2

determiniation of the therapeutic effectiveness of a specific treatment plan

Question 3

do interim restorations have different goals vs perminant

Answer 3

no

Question 4

ideal properties of provisional materials

Answer 4

Convenient handling: adequate working time, easy to mold, rapid set
biocompompatable
dimensionally stable
ease of contour
adequate strenth and abrasion resistnace
good appearance
good acceptability to patient
easy to add or repair
chemical caompatibility with interim luttin agent

Question 5

interim materials

Answer 5

Acrylics (monomethacrylates)
-polymethyl methacrylate
-poly ethyl methacrylate
Bisacryls (Dimethacrylates
-BisGMA based
-urethane dimethacrylate based

Question 6

uses of mono methacrylates

Answer 6

Provisions
curstom trays
denture, RPD base
low end denture teeth

Question 7

why use acrylics over bisacryls

Answer 7

cheaper

often used posterior

Question 8

why use bisacryls over acrylics

Answer 8

look better
faster
more expensive
often used anterior

Question 9

what is the intiator made of

Answer 9

2 componentes (SPO and AMine)

Question 10

what does really fast propogation lead to

Answer 10

greater heat(methyl methacrylate creates 1,000,000 units a sec

Question 11

how are monomethacrylates and dimethacrylates different chemically

Answer 11

Mono makes linear chains

di makes branched and crosslinked chains

Question 12

characteristics of monomethacrylates

Answer 12

Tough and soft

Question 13

characteristics of dimethacrylates

Answer 13

Brittle and Hard

Question 14

how is the change in density of a polymer reaction found

Answer 14

through the shrinkage

Question 15

how is shrinkage redued

Answer 15

through the addition of filler

Question 16

why can’t you mix liquids and solids from different acrylic systems

Answer 16

initiator systems

Question 17

what is found in the liquid of acrylics

Answer 17

MOnomers
inhibitors
chemical intiators (amine)

Question 18

what is found in the powder of acrylics

Answer 18

Polymer beads
Colorants
Chemical initators (BPO)

Question 19

what technology are bisacryl material based on

Answer 19

Composite tech (flowable)

Question 20

Bisacryle are based on what chem

Answer 20

Dimethacrylates

Question 21

characterisitcs of dimethacrylates

Answer 21

Higher moleculer weight monomers (oligomers)
silica fillers
reduced shrinkage

Question 22

advantage of bisacryltes

Answer 22

good surface hardness
good transverse strength
easy to use
low exothermic
low shrinkage
good margins
good abrasion
resistance
minimal pulpal shrinkage
good translucency and appearance
better stain resistance and color stability

Question 23

disadvantages of Bisacryltes

Answer 23

limited shades (but can layer with composite)
expensive
brittle
alteration and repair is hard

Question 24

what is the ESF made of

Answer 24

polypropylene

Question 25

how should the ESF be shaped

Answer 25

1-2 teeth on either side

1-2 mm beyond FGM