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Operative- ABGD Flashcards

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1
Q

What is the bactericidal composition of SDF?

A

38% fluoride
25% silver particles

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2
Q

How many ppm of Fl are in SDF?

A

44,800 ppm

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3
Q

How is SDF bactericidal?

A

“Zombie” effect. silver particles remain in the dead bacteria which kills the consuming bacteria

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4
Q

How much fluoride is in Fl Varnish?

A

5% NaF, 22,600ppm

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5
Q

How much fluoride is in rx toothpaste?

A

1.1% NaF, 5,000ppm

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6
Q

How much fluoride is in rx Fl rinse?

A

0.02% Neutral Sodium Fluoride 900ppm
prevident

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7
Q

how much fluoride is in OTC toothpaste?

A

0.12%: 1000ppm
0.25% NaF (sensodyne) : 1100

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8
Q

What are the advantages and disadvantages of calcium silicates compared to CaOH?

A

Advantage: (ie MTA)
increased antibacterial properties
increased dentin bridge formation
good dentinal seal

Disadvantage:
longer setting time
costlier than CaOH

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9
Q

What are the different types of ceramics- give examples

A

Glass:
- feldspathic- vitamark II
-Leucite reinforced: empress cad
-LiDi: emax cad

Oxide ceramics:
-Alumina- InCeram
-Zirconia: Zircad

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10
Q

What are the ways to pretreat restorative materials?

A

Air Abrasion with 50micron particles— metal alloys and zirconia

Acid etch with HF: glass ceramics

Tribochemical Silica Coating
- resin core materials
Zirconia?

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11
Q

What is MDP?

A

Phosphate methacrylate alloy primer that bond to non-precious metals and oxide ceramics.

MDP is an organic ester which can chemically bind to the oxide layer created on the metal surface through covalent bonds and also mechanical retention to the sandblasted surface. Among phosphate monomers, MDP seems to be more suitable for bonding to base metal alloys and provides greater bond strength.

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11
Q

What is Silane

A

A bifunctional molecule ceramic primer that bonds silica-based glass ceramics

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12
Q

what is VBATDT

A

Sulfide methacrylate alloy primer that bonds to precious metals

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12
Q

What are the ideal properties of a post?

A

max protection of the root from fx
max retention within rt
max retention of the core and crown
max protection of the crown marginal seal from leakage
pleasing esthetics
high radiographic visibinlity
retreviable
biocompatible

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13
Q

Explain the 4th gen bonding agents? What is an example?

A

3 step, E&R
Etch, rinse, prime, bond

Phosphoric acid
Hydrophilic primer (ethanol, acetone solvent)
Hydrophobic adhesive (non-solvated resin)

Example: Optibond FL

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14
Q

Explain the 5th gen bonding agents? What is an example?

A

2 step E&R
Etch, rinse, Prime/bond

Phosphoric acid
Hydrophilic primer (ethanol, acetone solvent) with a hydrophobic bonding resin

Optibond Solo Plus

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15
Q

Explain the 6th gen bonding agents? What is an example

A

2 step, Etch and dry OR 3 step with selective etch
(Etch/prime, and bond)
selective etch =. 3 step

Self etch with acidic primer
Hydrophobic filled bonding resin coating
excellent bond to dentin
Less sensitivity

Ex: clearfil SE protect or Optibond XR

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16
Q

What can occur if the solvent is not completely evaporated

A

unevaporated solvent will eventually be replaced by water which leads to hydrolysis of resin components and creates nanoleakage

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17
Q

Whatare dentinal collagen vunerable to and what else activates when exposed to etch and rinse procedures?

A

high vulnerable to hydrolytic and enzymatic degradation processes

Demineralization of dentin turns on MMPs (matrix metalloproteinases)

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18
Q

Explain 7th generation dentin bonding agents and give an example

A

1 step “one bottle”
etch/prime/bond

self etch
acidic primer with multiple functional monomers
poor performance clinically

Ex: optibond all-in-one

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19
Q

Explain 8th gen bond and give an example

A

1 step “one bottle”
etch/prime/bond

bonds to tooth and dental materials
multi-mode= etch and rinse, self etch, and selective etch

Scotchbond universal

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20
Q

What is the composition of enamel?

A

90% hydroxyapatite (inorganic)
10% water and organic

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21
Q

what is the sensitivity and specificity
what is preferred in dentistry

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A

sensitivity- true positives- tests for who has the d.z.
specificity- true negatives - test for who doesn’t have the dz.

better to have specificity to avoid over treating

High sensitivity = more false positives, but also fewer false negatives
High specificity = more false negatives, few false positives

21
Q

What is the composition of dentin

Study These Flashcards
A

50% hydryapatitie
30% collagen
20% water

22
What is the diagnodent and does it have high sensitivity or specificity?
uses laser fluorescence to aid in the detection of caries within the tooth structure sensitivity = over tx
23
Is the visual method for caries detection viable?
yes good accuracy and high specificity
24
What are the pathologic and protective factors for teeth in the caries process?
Pathologic: BAD bad bacteria absence of saliva destructive habits Protective: SAFE Saliva and sealants antimicrobials fluoride effective lifestyle
25
What is ICON?
low viscosity resin infiltration of for the tx of early lesions interproximal up to D1 (outer 1/3 od dentin) good for white spot lesions contraindicated in D2 or greater Uses HF to etch teeth
26
How deep can ICON penetrate? Is it more effective in active or arrested lesions?
450 microns best in shallow, active lesions
27
How strong is emax and what is the recommended thickness?
1mm- if bonding 500MPa
28
What is C-factor and what are the implications in restoring with composite
bonded surfaces/#unbonded surface lower C factor is better Class V is lower than Class I helps to understand polymerization shrinkage and sensitivity if there are more bonded surfaces, then there is more tension pulling away from multiple surfaces and shrinking thus, more sensitivity
29
What is the cervical margin elevation, is it viable?
GI or composite on margin to increase coronally. yes, 95% survival rate, but ≤2mm from bony crest = greater BOP
30
What is the longevity of veneers?
10 years- 95%
31
What is the most critical factor in a veneers success?
Enamel 10x greater failure risk when bonded to dentin instead of enamel
32
If we wanted to bond to Zirconia do we etch? How do you bond to zirconia?
no. Zirconia is a polycrystalline solid and has no glass 50micron aluminum oxide air abrasion of intaglio use MONOBOND PLUS ( bifunctional 10-MDP monomer can bond to metal oxide) or ROCATEC (tribochemical silica coating) to bond
33
What is connector and pontic sizes needed for zirconia?
Anterior: 7mm2 Post: 9mm2 2 pontics: 12mm2 height is most important
34
What are things to consider with air abraiding zirconia?
% yttria (3, 4, 5, mol) the one with less tetragonal % might be more detrimental since it does not undergo as much transformation toughening to monoclinic particles
35
What are the different types of resin cements
Curing light cure dual cure Tx Esthetic: total etch adhesive: self etch self adhesive
36
What can you tell me about “Universal Adhesives”?
all in one can be used for E&R, selective etch, and self etch lower pH, enhancing self etch mode MDP functional monomer- good for dentin may include primers for glass and oxide ceramics IE: scotchbond universal- 8th gen- contains silane but not as effective as separate silane
37
What is an example of a bioactive resin material?
Activa Calcium silicate and calcium aluminate materials for an apatite like material on the surface limited research have high early failure rates for class I and 2 also: proroot MTA, biodentine, endosequence, ceramir C&B (luting)
38
How are manufacturers reducing shrinkage in bulk-fill materials?
using "stress-reducing resins" fragmentation monomer,
39
Whats the difference between incremental and bulkfill techniques?
Incremental: 2mm then cure, decreased polymerization shrinkage by placing at diagonals with less walls bulkfill up to 5mm composite then cure. larger filler particles, more photoinitiators, increased tramslucency maybe less voids
40
What composite do you use and why?
Filtek supreme: nanofilled composite Why: good polishability, good esthetics, easy to get, good strength and shades, minimal shrinkage (<1%) 65-75% filled depending on translucency level good wear and high fracture strength (350MPa) omnichroma technically less good shade match, butmost people don't notice for molars supranano spherical filler 79% higher polish than filtek flex strength < filtek compressive similar to filtek less wear than filtek higher shrinkage 1.5% stain resistance same not as hard as filtek, but a more consistant cure at 4mm
41
What is the blue light hazard?
Blue light, 440nm absorbed by retina and can damage it. Camphoroquinone 460
42
What is the ISO standard for minimum output of a curing light What do most composites recommend for cure?
ISO: 300mW/cm2 Composite: 550mW/cm2
43
When did the EPA mandate amalgam separators be used by?
2020
44
What is an amalgam separator and how does it work?
reduce amalgma discharged into water system. removed from waste vaccume system by sedimentation, filtration and ion exchange. prohibits used of bleach in lines that may dissolve solid mercury when cleaning traps and vacuum lines
45
What type of amalgam do you use and why?
Contour amalgam- admixed 70% spherical and 30% lathe cut High copper (28%) to decrease gamma 2 phase and corrosion great strength and handling 533MPa @ 25 hrs almost 10 min working time
46
What kind of curing light do you use and why?
Elipar LED by 3M uniform distribution 2.1 mm curing depth, easy to hold one to, has sheilding high intensity: 1200mW/cm2
47
What is clearfil SE
6th generation bonding system 2 step etch and rinse. can use selective etch great bond to dentin, less post op sensitivity
48
Do you use sectional matrix for class 2?
yes, better contours, saves time, more predicable garrison or V3s
49
What are some disadvantages of IDS
additional steps potential incompatibility with impression or temp materials technique sensitive (remove excess material on enamel margins
50
What do studies say about IDS?
Lab studies show improved bond strength, fewer gap formations, less bacterial leakage no difference in post op sensitivity, but 11 yr clinical study shoed that feldspathic veneers with more than 50% dentin exposure had significantly better survival with IDS (96 vs 82%) The use of filled adhesive resins (low elastic modulus liner) facilitates the clinical and technical aspects of IDS
51
What do you know about millable ceramic polymer materials?
Example: vita enamic or Lavac Ultra highly polymerized composite materials that have greater fracture roughness, better edge quality and no sintering higher debonding for full crowns, because they flex. more suitable for inlays and onlays
52
What are the risk factors that would lead you to classify somone as moderate or high caries risk
Poor OH cariogenic diet exposed roots enamel defects multisurface restores overhangs or open margins active ortho cariogenic bact chemo/rad eating dioders disability that prevents good OH subopitnal Fl xerostomia
53
what do you do for high caries risk patients?
OHI fluoride eliminate caries sealants remineralize incipient diet counseling prevident and/or CHX (1 week a month) xylitol recall Q3months moderate risk = 6mo eval salivary flow
54
what is the critical pH of enamel?
5.5

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