6. Posterior Composite Restoration Flashcards
Posterior Composite Restoration
REMEMBER:
• Composite resin materials have a ____ depth of cure
– they must be placed in increments, usually not exceeding ____ mm; preferably 1mm
• \_\_\_\_ has a limited curing range
limited
2
light
REMEMBER:
• Composite resin materials experience polymerization shrinkage upon curing
– they must be placed in increments, to reduce the amount of ____
– Reduction in polymerization shrinkage reduces microscopic gap formation, and possibly reduce ____
• Cusp deflection - polymerization shrinkage pulling on the \_\_\_\_ creating discomfort ○ Reason why you don't bulk fill
polymerization shrinkage
cusp deflection
cusps
REMEMBER:
• Since recurrent caries is one of the main reasons for failure:
– it is important to make every effort to minimize ____ at the tooth- resin interface by implementing the incremental placement technique
gap formation
Bonding System Choice Is Critical
Want:
• Strong ____
• Good ____
enamel bond
dentinal seal
Bonding System Choice
- Total etch
- Self etch
- Selective self etch
YAY
Bonding System Choice
Bonding System Decision Making:
-Class III, IV, V
____ dentin involved > ____ etch
-Diastema
____ dentin involved > ____ etch
-Larger/Deeper Class III, IV and V
____ dentin involved > ____ etch or *____ etch
- Research supports this method provides the best marginal seal. Use ____ etch on external cavosurface enamel for best bond strength there.• A little bit of dentin and a lot of enamel
little total no total more self selective self phosphoric acid
Bonding System Choice
Bonding System Decision Making:
-Class I and II
____ dentin involved > Small box > ____ etch
____ dentin involved > Large box or deep preparation > *____ etch
- Research supports this method provides the best marginal seal. Use Phosphoric acid etch on external cavosurface enamel for best bond strength there.
little
total
more
selective self
Bonding System Choice
• Studies show for Posterior teeth:
-____ box preparations (little dentin) show less enamel marginal microleakage with ____ etch bonding systems vs plain self etch bonding systems
-Example: ____ slot; small pit, etc
smaller
total
premolar
Bonding System Choice
• Studies show for Posterior teeth:
-More predicatable dentin bond strength is found with the ____ etch bonding system when the preparation is larger and deeper (more dentin exposed).
-Example: Conservative Class I and Class II
self
Bonding System Choice
• Studies show for Posterior teeth:
-The ____ etch bonding system shows a better enamel marginal seal than the conventional Self etch bonding systems
selective self
Posterior Composite Resin Placement Technique
Palodent Plus Sectional Matrix System
* Not \_\_\_\_ * Convex * No \_\_\_\_ * Separate teeth > compensate for the \_\_\_\_ of the band > for when you take matrix out so there isn't an open contact beccause you didn't use a wedge * Ring doesn't obstruct view of occlusal * Little band rests along adjacent \_\_\_\_ * Should have \_\_\_\_ on the palodent
circumferential
thickness
marginal ridge
floss
Posterior Composite Resin Placement Technique
Polymerization Shrinkage:
• Curing contraction in a bonded restoration generate stress on the walls of the tooth
• “____” is a term that relates the ratio of ____ walls of the tooth to ____ walls
• Bulk fill indications - recovering after endodontics - using a \_\_\_\_ composite during a build up (internal structure of the tooth)
configuration factor/c-factor
bonded
unbonded
dual cure
Posterior Composite Resin Placement Technique
Polymerization Shrinkage:
“C” Factor:
-The Ratio of Bonded/Restored walls/surfaces to Non Restored walls/surfaces
-Every restoration is like a cube, with ____ sides
-The higher “C” factor, the ____ stress the cavity will be under when restored unless special accommadations
are met during restoration placement phase
6
more
Posterior Composite Resin Placement Technique
“C” Factor:
• Presence of ____ and fracture lines beyond the restoration - resulting from the shrinkage of the material (____)
craze
instantaneous
Posterior Composite Resin Placement Technique
“C” Factor Examples:
• Class I: ____ walls bonded (M,D,B,L,P) /1 surface not (O) = ratio of 5/1
-“C” Factor of ____
• Class II (1 proximal surface): ____ surfaces bonded (M or D, P, B,L)/ 2 not (M or D,O)
- “C” Factor of ____
• C Factor of 5 - high polymerization shrinkage
5
5
4
2
