Operative

Question 1

what converts sucrose to glucans and fructons in s. mutans?

Answer 1

glucosyltransferase

*enamel carries

Question 2

large molecules in saliva that agglutinate bacteria together to help eliminate them through swallowing?

Answer 2

glycoproteins

Question 3

destroys cell walls and found in saliva

Answer 3

lysozyme

Question 4

found in saliva and actively binds to iron (inactives iron)

Answer 4

lactoferrin

Question 5

lactoperoxidase does what?

Answer 5

inactivates some bacterial enzymes

Question 6

how much mineral loss must a tooth have before it is seen on xray?

Answer 6

30-40%

Question 7

5 phases of txt planing

Answer 7

1) urgent
2) control
3) re-evaluation
4) definitive
5) maintenance

Question 8

cutting vs
finishing vs
fine finish vs
ultra fine finish

Answer 8

cutting = 6 blades
finish= 12
fine finish= 18-24
ultra fine= 30-40

Question 9

line vs point angle

Answer 9

line angle= junction of 2 walls

point angle= junction of 3 walls

Question 10

outline form: extension to sound tooth structure at an inital depth of _____?

Answer 10

0.2mm into dentin

Question 11

resistance form

Answer 11

prevention of fracture from occlusal forces

Question 12

retention form

Answer 12

prevention of displacement

Question 13

liner

Answer 13

CaOH

* used for direct or near pulp exposures and pulpal treatment for formation of tertiary dentin

Question 14

desensitizer

Answer 14

GLUMA
* used for sensitivity, occludes dentinal tubules
5% glutaraldehyde
35% HEMA

Question 15

gold only prep

Answer 15

collar= beveled shoulder around capped cusp for bracing

skirt= feather edge margin

Question 16

base

Answer 16

RMGI

* used for metal restorations

Question 17

composite prep

Answer 17

used coarse diamond for rough walls

Question 18

amalgam prep

Answer 18

carbide bur for smooth walls

• ** 1.5-2.0mm depth for thickness***
• 90 degree cavosurface margin
• 90 degree amalgam margin
• occlusal convergence, grooves, slots, pins

Question 19

Eames Ratio

Answer 19

Dental Amalgam is 50/50 mercury/metal alloy

1) silver and copper for strength
2) tin for corrosion
3) sinc for deoxidizer but excess expansion if moisture contamination

Question 20

under tritration for amalgam

Answer 20

dry, dull, crumbly, sets too quick

Question 21

sphericalvs admixed alloy particles

Answer 21

spherical= easier to condense and stronger, microspheres of various sizes, sets faster

admixed= more condensation forces and better proximal contacts, mixture of irregular and spherical pieces

Question 22

3 mercury forms

Answer 22

1) methylmercury= organic, most toxic (fish)
2) elemental= liquid metallic, in dental amalgam
3) mercury salts= inorganic

Question 23

dentin or enamel is more mineral?

Answer 23

enamel is 88%

dentin only 50% mineral

Question 24

etch

Answer 24

phosphoric acid

• makes microporosities and widens dentinal tubules
• use gluma after

Question 25

primer

Answer 25

HEMA (HydroxyEthyl MethAcrylate) * contact dermatitis * prevents collagen collapse

Question 26

Bond/Adhesive

Answer 26

Bis-GMA (Bisphenol A-Glycidyl Methacrylate) *chemically bonds to both primer and composite

Question 27

describe parts to resin

Answer 27

1) resin matric (Bis-GMA) 2) Filler particles (silica) 3) Coupling Agent (Sline)

Question 28

initiator for self cure?

Answer 28

benzoyl peroxide

Question 29

activator for self cure?

Answer 29

tertiary amine

Question 30

photoinitiator for light cure?

Answer 30

camphorquinone (need 468nm light needed)

Question 31

C-factor

Answer 31

* larger the c-factor the most stress/shrinkage/sensitivity/leakage * bound to unbound * inversely related to GV Black

Question 32

glass ionomer

Answer 32

``` *weak, salt-matrix acid= polyacrylic acid base= fluoraluminosilicate glass *CHEMICAL bond * FLUORIDE release ```

Question 33

composite resin

Answer 33

*stonger, resin-matrix * no fluoride *micromechanical bond Matrix= Bis-GMA Filler= barium silicate glass

Question 34

resin-modified glass ionomers

Answer 34

light or chemical cure | *rapid polymerization and free radical initiation

Question 35

compomers (polyacid-modified resin composites)

Answer 35

paste containing both CR and GI (except for water) | * SLOW polymerization, fluoride release

Question 36

ionomer-modified composites

Answer 36

least common, has ion-leachable glasses in an attempt to achieve fluoride release