Clinical Composite

Question 1

on average how long should composite inlays last

Answer 1

2.9 years

Question 2

what is the most common problem with clinical composite

Answer 2

poor placing and handling of the material

Question 3

what factors do we need to consider

Answer 3

• tooth biology
• materials science
• interfaces
• marginal seal
• manipulation
• polymerisation
• prism orientation (look at diagrams i dont understand)

Question 4

what should be avoided in areas of occlusal contact

Answer 4

cavosurface margins

Question 5

what does caries left at the ADJ result in

Answer 5

unsupported enamel and early breakdown of the restoration margin if microleakage occurs

Question 6

what should be included in the design for interproximal caries access and removal

Answer 6

• no unsupported enamel
• proximal axial bevel
• gingival bevel

Question 7

how can enamel fracture be avoided

Answer 7

• cavity design
• etch times
• washing
• curing protocol

Question 8

what does a white line on your restoration after curing indicate

Answer 8

the restoration is doomed to an early failure

Question 9

what is favourable for hybrid layer creation

Answer 9

primary dentine - open tubules

Question 10

what is unfavourable for hybrid layer creation

Answer 10

tertiary dentine - irregular structure
not great to bond to
restoration contracts then there is a risk of failure

Question 11

describe deeper dentine

Answer 11

• wetter
• more mineralised
• more tubes

Question 12

describe older dentine

Answer 12

• fewer tubules
• more mineralised
• occluded tubules

Question 13

describe reactive dentine

Answer 13

• occluded tubules
• more mineralised / contaminated
• irregular tubules

Question 14

there are slides on hybrid layer and poor quality dentine that i dont understand because they are just lists

Answer 14

so probs look them up lol soz x

Question 15

what type of dentine is good for bonding

Answer 15

freshly cut dentine

Question 16

what things should be considered when working with enamel

Answer 16

• patient and cavity selection
• isolation
• choice of material
• choice of shade
• cavity preparation *
• bonding *
• contacts *
• placement *
• curing
• countering contraction stresses *
• finishing and polishing
• staining
• surface sealing

Question 17

can you bond materials to caries?

Answer 17

no

all caries needs to be removed

Question 18

define configuration factor

Answer 18

refers to the number of bonded surfaces to the number of unbonded surfaces in a dental restoration

Question 19

define polymerisation contraction stress

Answer 19

an undesirable and inevitable characteristic of adhesive restorations encountered in clinical dentistry that may compromise restoration success
when the material is placed in just one increment it will shrink and pull away from the surface of the cavity and cause gaps
i can’t find a proper definition online :( i dont even know if the gaps part is right my notes confuse me

Question 20

how does a high configuration factor affect polymerisation contraction stress

Answer 20

increased polymerisation contraction stress

Question 21

how does a low configuration factor affect polymerisation contraction stress

Answer 21

reduced polymerisation contraction stress

Question 22

define plasticity

Answer 22

a property of a material to undergo a non-reversible change of shape in response to an applied force (polymerisation)

Question 23

define deformation

Answer 23

a change in shape due to an applied force (contraction)

Question 24

state the clinical procedures of a restoration placement

Answer 24

- etch
> enamel 10secs
> dentine 10secs
> leave surface slightly moist 
- prime
- bond
> these 2 are usually together
- placement 
- characteristics 
- finish

Question 25

what is the need for flowable composite

Answer 25

to mediate contraction stressed on interface and to achieve optimal adaption to non load bearing margins

Question 26

where does the first increment go

Answer 26

on floor only

reservoirs for plastic deformation

Question 27

what is the minimum intensity required to adequately cure 1.5mm to 2mm of composite resin

Answer 27

between 280 and 300 mW/cm2

Question 28

when do you use a high power curing light

Answer 28

for fast curing

Question 29

when do you use low power curing light

Answer 29

when working close to pulp

Question 30

what is the main reason for reduced shrinkage stress

Answer 30

decreased final conversion

Question 31

what is shrinkage direction determined by

Answer 31

bonded surfaces and free surfaces

Question 32

when do composites shrink towards the light

Answer 32

when bonding fails

Question 33

what is polymerisation of all materials due to?

Answer 33

halogen like emission spectrum (~380-515 nm)

Question 34

what are the steps for clinical procedure for a restoration

Answer 34

1. silicone matrix
2. matrix in situ
3. proximal strip added
4. palatal enamel increment
5. palatal / proximal shell
6. contact areas restored with enamel
7. dentine build up
8. intensive white added for effect
9. final enamel layers
10. contouring
11. preliminary polish
12. penultimate polish
    see pictures in lecture

Question 35

what can poor quality dentine be covered by

Answer 35

resin glass ionomer

Question 36

what should you check the gingival floor for when doing the proximal restoration

Answer 36

that you dont have overhangs

Question 37

Who should you add on snapchat

Answer 37

ewan_kemp