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Ops Test 1
ch 9, 10, 16
26
Other
Post-Graduate
10/25/2010

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Cards

Term
A
B
C
D
E
Definition
Appropriate Indications
Bonding
Clinical Techniques
Dental materials
Evidence based
Term
in 2005, 166 million restorations were placed. what percent were composite and what percent amalgam?
Definition
47% composite
32% amalgam
Term
In what yr did composite become more used than amalgam
Definition
1998
Term
PROH stands for hwat
Definition
Practice based Research in Oral Health
Term
in the 07 Hilton PROH survey what was the risk of crack by restoration type vs. virgin tooth for amal and comp
Definition
7.72 for amalgam
4.05 for composite
Term
In the 97 research studies, what was the reason difference in survival between amal and comp
Definition
secondary caries- 3.5 x greater for composite
Term
In the 07 5 yr study both materials showed higher failure rate when what?
Definition
the restorations were larger
Term
the 07 10 yr and 12 yr studies showed what?
Definition
amal had around 2/2.5 AFR and composite had 1.7 failure rate
Term
the 07 study showed what about caries risk?
Definition
for high caries risk grp- amal had longer longevity for 3 surface restoration, and equal longevity for 4/5 surface restorations.
in the low risk grp- composite had longer longevity always
Term
ideal indications for posterior composites
Definition
1) not allergic
2) demonstrates good hygiene
3)esthetic of prime importance
4) B/L width less than 1/3 in intercuspal distance
5)centric stop on sound enamel
6)no bruxism or heavy occlusal contacts
7)gingival margin on intact enamel
8) able to isolate with rubber dam
Term
what percent of schools agree what about percent of contraindications for posterior composties?
Definition
75% of schools agree about 25% of contraindications
Term
what did studies show concerning amal vs composite conservation of tooth structure
Definition
amalgam occupied 25% of occlusal surface vs 5% for composite
Term
what did studies show about left behind caries with a composite restoration
Definition
caries would not progress under a sealed restoration- you get an immediate seal with etching, a seal after 5 yrs without etching
Term
in the 70s and 80s what was the primary cause of posterior composite failure?
Definition
wear
Term
what is the primary cause of posterior composites now?
Definition
loss of marginal integrity
Term
marginal deterioration is a significant predictor of restoration failure- numbers
Definition
loss or marginal integrity @ 3 yrs = 5.3 x failure at 5 yrs
marginal discoloration @ 3 yrs = 3.8 x failure at 5 yrs
both @ 3 yrs= 8.7 x by 5 yrs
Term
contraindication for posterior composites
Definition
1) restoration should not be placed on supporting cusp
2) large restorations in patients with a lot of parafunction on the resotration
3)non compliant patients at high caries risk
4)inability to obtain field isolation by any method
Term
in vivo degradation of resin - dentin bonds
Definition
bond of resin to dentin- went down by 50% each yr in the mouth
Term
how do the failure rates compare for age 18-54 between amal and comp?
ages 55-96?
Definition
equal for 18-54, composite had greater failure for those aged 55-96
Term
life expectancy of composites is dependent on?
Definition
case selection
operator technique and training
patient hygiene and habits
Term
kes to success for posterior composites
Definition
1) appropriate indications
2) prep design- pre wedging and caries removel
3)glass ionomer liner to reduce post op sensitivity
4)apply adhesive system correctly
5)matrix (contoured sectional) for contour and contact
6) inject composite to decrease voids
7)incremental placement
8)polymerize class 2s from proximal
9)minimize and delay rotary instrument finishing
3)
Term
avoid sharp line angles- why?
Definition
sharp line angles- crack initiators
bad adaptation
Term
bevels? where?
Definition
occlusal- no proximal- if not already obtuse gingival- if over 1mm from CEJ
Term
sectional matrices give whaT?
Definition
significantly stronger prox. contacts
proximal contacts that maintain pre-restoration levels vs circumferential matrix in class 2 restorations
significantly stronger marginal ridge strength
Term
what percent voids do the diff methods of placing composite give?
Definition
condense- 2.5%
smearl- 1.4
inject- .6%
Term
how long does it take composite to warm up in the calSet and how long does it take to cool down in the prep?
Definition
11 mins to get to Tmax, composite takes 11 mins to get to Tmax in unit, composite cools to T1/2 in 2 mins
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