Midterm - Composite

Question 1

Polymerization/Curing

Answer 1

setting and hardening, doubles bonds to single bonds

Question 2

Degree of Conversion

Answer 2

measure of the extent of polymerization, the % of C=C bonds into single bonds

Question 3

Activation

Answer 3

initiating curing

Question 4

Autocure

Answer 4

a chemical reaction started by mixing two components

Question 5

Photocure

Answer 5

light activated (a single component) - UV, visible light cure

Question 6

Dual Cure

Answer 6

starts with photo cure, completes with chemical autocure

Question 7

Without Silane Coupling Agent

Answer 7

lack of bonding between filler/matrix, easy separation, leakage, decreases fracture, fatigue, wear resistance

Question 8

Silane Chemistry

Answer 8

reacts to filler via alkyoxysilane groups (Si-O-Si)
reacts with itself to form siloxane
reacts with methacrylate groups in resin

Question 9

Light Activation Peak

Answer 9

peak intensity between 450-490nm

Question 10

Risks of Inadequately Cured Resins

Answer 10

allergen leaching
increased marginal breakdown
increased secondary decay

Question 11

Dual Cure: One Component Systems

Answer 11

one paste, initial cures by photo cure, finishes with autocure
no mixing

Question 12

Dual Cure: Two Component Systems

Answer 12

two pastes, base paste can be light cured only, activator allows for chemical curing
bulk filling, remote areas inaccessible to light cure

Question 13

Total Retentive Force

Answer 13

retention power, depends on the cavity surfaces in bonding, the greater the number of bonded surface and fewer unbounded surfaces, greater will the retention power be
C-factor

Question 14

Filler Distribution

Answer 14

different sizes in a filler allow for greater total amount in a given volume

• large = strength
• smaller = higher polish/finishability

Question 15

Recommended Use: Packable

Answer 15

class I, II, VI

Question 16

Recommended Use: Flowable

Answer 16

small class III or V, pediatric, block-outs, liner, small repairs

Question 17

Recommended Use: Microfilled

Answer 17

small class I, enamel replacement in class III,IV,V, veneers, diastema closure

Question 18

Recommended Use: Conventional/Mirco/Hybrids

Answer 18

general purpose Class I-VI

Question 19

Advantages Composite

Answer 19

esthetic
time saving
operator control/creativity
minimally invasive
biologic compatibility
won't wear opposing dentition
handling properties
reparability 
long lasting - high strength

Question 20

Critical Elements to Success

Answer 20

isolation
tissue management
proper bonding technique

Question 21

Proper Placement Technique

Answer 21

incremental layering no more than 2mm thick layers

Question 22

Purpose in Finishing/Polishing

Answer 22

high luster
plaque resistance
stain resistance

Question 23

Desirable Properties: Handling

Answer 23

tackiness/stickiness, stiffness, spreadability, non-slumpy, ability to brush (flowables)

Question 24

Desirable Properties: Multiple Applications

Answer 24

anterior, posterior, esthetics

Question 25

Desirable Properties: Radiopacity

Answer 25

important for radiographic identification and diagnosing recurrent decay
higher filler = more radiopaque

Question 26

Desirable Properties: Polishability

Answer 26

microfils - easiest, hybrids more comparable with more robust system

Question 27

Shade: Hue

Answer 27

basic tooth color, majority are in A range (yellow)

Question 28

Shade: Chroma

Answer 28

saturation, strength of dominance of the hue (75+% teeth A2)

Question 29

Shade: Value

Answer 29

measure of brightness, higher value = brighter, lower value - darker

Question 30

Shade: Polychromatic

Answer 30

higher chroma gingival third, lower chroma higher value in middle third, incisal third anteriors translucency (halo effect)

Question 31

Shade: Metamerism

Answer 31

matching of apparent color of objects with different spectral power distributions, in different light, different absorption/reflection = appears different

Question 32

Accurate Shade Selection

Answer 32

natural light
completed first
teeth must be hydrated