CERAMIC VENEERS II

Question 1

venner prep depends on

Answer 1

method of fabrication
occlusion
described aesthetics
any parafunction
presence of enamel at all proposed margins

Question 2

veneer material can be either

Answer 2

composite resin

ceramic

Question 3

indications of a direct composite veneer

Answer 3

extensive damage to incisal or buccal surface
defective restoration
discolouration not amendible to bleaching
mis aligned teeth (pt no ortho)
congenitally deformed teeth
pt does not have time or finances

Question 4

contra indications of a direct composite veneer

Answer 4

inability to obtain correct shade to blend with adjacent teeth
inability to obtain correct contours
inability to correct surface characteristics
inability to obtain proper isolation
multiple teeth due to extensive time and difficulty in achieving consistent shade

Question 5

advantages of direct composite veneer

Answer 5

little or no tooth prep required
many composite wear naturally to natural tooth structure and do not cause iatrogenic wear of opposing dentition
chairside repair

Question 6

dis of composite venner

Answer 6

colour stability
not as long lasting as ceramic alternative
not as strong
wears more than ceramic

Question 7

indirect composite technique

Answer 7

minimal prep
0.25-5 mm tooth reduction
resin cement for cementation

Question 8

advantages of indirect over direct veneer

Answer 8

reduced PS(shrinakge)
smaller marginal gap created
reduced marginal leakage, sensitivity, recurrent caries, staining
better control over interproxmial contours
less technique sensitive than direct one

Question 9

components of indirect ceramic veneer

Answer 9

veneer
acid etched surface
sialine coupling agent
resin cement

Question 10

advantages of ceramic veneer

Answer 10

• superior aesthetics
• excellent long term durability
• strength
• marginal integrity
• soft tissue compatibility
• minimal tooth reduction

Question 11

lab techniques to make veneersf

Answer 11

foil based
castable ceramic
refractory 
CAD CAM
pressable (high pressure moulding)

Question 12

prep vs no prep

Answer 12

no prep
- reversible
painless
- overcontoured
- margins
- gingival infalmation
- high failure rates

Question 13

tooth prep measurements

Answer 13

0.3-5mm chamfer
0.6-8 incisal and buccal reduction
facial reduction in 2 planes

Question 14

what does pre allow

Answer 14

less stress concentration

removes prismatic and hypermineralised enamel layer which are more resistant to acid etching

Question 15

types of perparation

Answer 15

incisal edge
feather edge
further over incisal edge

Question 16

different prep designs

Answer 16

window
long bevel
complete veneer coverage

Question 17

when is window prep useful

Answer 17

canine guidance
class 2 div 2 or class 3
margin short of incisal edge

Question 18

types of temps

Answer 18

direct composite build up with spot etching of enamel
chariside
protemp
indirect temp from lab

Question 19

cementation in the try in stage

Answer 19

resin luting agent
veneers should be tried in to assess fit and aestheics
try in paste
- water soluble, matches cement, optical contact

Question 20

what can cause resin spaces

Answer 20

insufficient luting agent

incorrect sequence of seating mutiple veneers

Question 21

cementation procedure steps

Answer 21

etching of tooth surface
bonding agent
resin cement

Question 22

failures of restorations aetiology

Answer 22

unfavourable occlusion
parafunction 
bonding to existing restorations
microleakage
debonding

Question 23

types of veneer fractures

Answer 23

static
cohesive
adhesive

Question 24

static fracture

Answer 24

when a segment of veneer fractures but remains on tooth

Question 25

cohesive frature

Answer 25

occurs within the body oc ceramic due to tensile loads from excessive functional or parafunctional loading
loss of fragment

Question 26

adhesive fracture

Answer 26

failure of bonding interface

due to weak bond or severe occlusal loading

Question 27

debonded veneer cause

Answer 27

determine which bonded interface has failed
- if luting agent still on tooth due to inadequate etch of veneer or no sialine coupling agnet
if luting on veneer
- problem with bonding materials
placement technqiue or bonding substrate
more likely when predominately to dentine