Midterm 1: O Composite Prep + Restoration + Adhesives and Composites

Question 1

What are the cavity classifications?

Answer 1

Class I
Class II
Class III
Class IV
Class V
Class VI

Question 2

What is a Class I Cavity?

Answer 2

pits and fissures of occlusal surfaces of posterior teeth
occlusal 2/3 of buccal and lingual of molars
lingual of maxillary incisors

Question 2

What is a Class III Cavity?

Answer 2

Proximal surfaces of anterior teeth

Question 3

What is a Class II Cavity?

Answer 3

proximal surfaces of posterior teeth

Question 4

What is a Class V Cavity?

Answer 4

Gingival third of teeth

Question 4

What is a Class IV Cavity?

Answer 4

Proximal surfaces and incisal edge of anterior teeth

Question 5

What is a Class VI Cavity?

Answer 5

Incisal edge of anterior teeth and cusp tips of posterior teeth

Question 5

The ICDAS uses __________ assessment, NOT sharp instruments.

Answer 5

visual

Question 6

What ICDAS categories are in the moderate caries management stage?

Answer 6

ICDAS 3-5

Question 7

Which ICDAS categories are in the severe caries management stage?

Answer 7

ICDAS 6

Question 8

What ICDAS categories are in the initial caries management stage?

Answer 8

ICDAS 0-2

Question 8

What is the cavosurface margin?

Answer 8

The junction of a prepared wall and external surface of the tooth
where the CAVITY preparation meets the ORIGINAL tooth surface

Question 9

What is a line angle?

Answer 9

line between two points
junction of two walls

Question 10

What is a point angle?

Answer 10

junction of three lines/walls

Question 11

What is the outline form?

Answer 11

external outline of the tooth surface to be included in the prep along the cavosurface margin

Question 12

What is retension form?

Answer 12

prevention of restoration displacement

Question 12

What is convenience form?

Answer 12

access and visibility

Question 13

What is resistance form?

Answer 13

prevention of restoration (and/or tooth) fracture from occlusal forces

Question 14

What is the mesio-distal angulation of mandibular teeth?

Answer 14

Bur is tipped lingually

Question 14

Why are buccal/lingual walls parallel to slightly truncated on the long axis of the crown?

Answer 14

help in retention
avoid damaging the pulp

Question 15

What is the 6th gen self etch technique?

Answer 15

self etching primer and adhesive separate

Question 16

What is the 7th gen adhesive system?

Answer 16

etch, primer, adhesive combined into one

Question 17

What is the selective etch technique?

Answer 17

35-37% phosphoric acid etch
etchant only on enamel
rinse off after 15 seconds
dry

Question 18

Why do we scrub the scotchbond onto the preparation for 20 seconds?

Answer 18

To ensure the adhesive gets into the grooves created by the etch

Question 19

What are the components of the ultradent wetting resin?

Answer 19

45% filled resin no solvents does not inhibit polymerization use very small amount prevents composite from sticking to instrument

Question 20

What are neoshine polishers?

Answer 20

designed to polish nanocomposite

Question 21

What does Satin Neoshine Polishers do?

Answer 21

removes scratches and imperfections for a smooth shine

Question 22

What are Hi-Gloss Neoshine Polishers?

Answer 22

high luster

Question 23

TRUE OR FALSE enamel bonding is reliable, predictable, and strong

Answer 23

TRUE

Question 24

Acid etching transforms smooth enamel surface into what?

Answer 24

irregular (porous) surface

Question 25

What is the smear layer?

Answer 25

layer of organic and inorganic debris that seals the dentinal tubules reduces permeability caused by instrumentation of the preparation

Question 26

Why is the smear layer bad or good?

Answer 26

BAD: interferes with adhesion GOOD: reduces post operative sensitivity

Question 27

How does the smear layer reduce post operative sensitivity?

Answer 27

smear layer PLUGS the dentin tubules prevents the fluid inside to be exposed

Question 28

Which is easier: dentin bonding or enamel bonding? Why?

Answer 28

Enamel bonding enamel structure is more structured/predictable therefore easier to etch DENTIN TUBULES and collagen are like a MAZE Dentin is filled with fluids and enzymes that may interfere with bond integrity

Question 29

Dentin bonding includes which three steps?

Answer 29

Etch Primer Adhesive (Bond)

Question 31

What is the purpose of etch?

Answer 31

removes the smear layer

Question 32

Etched enamel creates what?

Answer 32

microporosities chalky/froster white appearance if you air dry it

Question 33

What does etched dentin do?

Answer 33

exposes layer of collagen widens dentinal tubules

Question 34

Is resin hydrophobic or hydrophillic?

Answer 34

hydrophobic

Question 35

Primer contains a ________________- end that interacts with the moisture on the tooth and a _____________ end that provides bonding sites for the adhesive

Answer 35

Hydrophilic Hydrophobic

Question 36

What is the primer's function in dentin bonding?

Answer 36

infiltrates dentinal tubules wets dentin surface prevents collagen collapse keeps the "spaghetti" moist/upright for micromechanical interlock

Question 37

Do we need primer for enamel bonding?

Answer 37

No

Question 38

What is Bis-GMA

Answer 38

part of adhesive/bond bonds to underlying primer and overlying composite resin

Question 39

Why do we gently air thin the primer and the adhesive for a few seconds?

Answer 39

to evaporate the solvent which we no longer need at this point, leaving a nice thin layer of primer/adhesive inside the cavity prep TO MAKE THE LAYER THIN AND NOT TOO BULKY

Question 40

What does the primer and adhesive create?

Answer 40

the hybrid layer

Question 41

What type of interface does the hybrid use?

Answer 41

mechanical

Question 42

What are resin tags?

Answer 42

adhesive resin lock into the microporosities of etched enamel and dentinal exposed collagen and widened tubules

Question 43

What kind of bond is there between the tooth structure and the prime/bond (adhesive)?

Answer 43

Micromechanical

Question 44

What kind of bond is there between the primer, the adhesive, and the resin?

Answer 44

Chemical

Question 45

Which generations reduced post op sensitivity since smear layer is providing some sealing of dentinal tubules?

Answer 45

6/7

Question 47

What are the components of composite resin?

Answer 47

1. Resin Matrix 2. Filler (Silica) 3. Coupling agent (Silane)

Question 48

What are the characteristics of resin matrix?

Answer 48

Bis-GMA (resin) + initiator monomers become polymers after curing light negligible health hazard

Question 49

What are the characteristics of filler (silica)?

Answer 49

Radiopaque various shapes/sizes affect properties of the composite

Question 50

What are composite types (according to filler size)?

Answer 50

1. Macrofill 2. Microfill 3. Hybrid 4. Nanofill 5. Nanohybrid

Question 50

What are the characteristics of coupling agent?

Answer 50

Promotes adhesion (chemical) between the filler and resin matrix

Question 51

What are the characteristics of macrofill?

Answer 51

large particles good fracture resistance low shrinkage poor wear resistance poor polish

Question 51

What are some characteristics of microfill?

Answer 51

very small particles fractures easily more shrinkage better wear resistance polishable

Question 52

What are the characteristics of nanofill?

Answer 52

clusters of extremely small filler particles glomerate to provide full range of filler sites

Question 53

What are the characteristics of hybrid?

Answer 53

combines the good properties of micro/macrofill

Question 54

What are some characteristics of nanohybrid?

Answer 54

incorporates the nanofill particles and integrates them with other sizes

Question 55

What are the composite types (according to the way it polymerizes)?

Answer 55

1. Self-cure 2. Light-cure 3. Dual cure

Question 55

What are the composite types (clinical)?

Answer 55

1. flowable 2. packable 3. fissure sealant

Question 55

What is polymerization shrinkage?

Answer 55

composite resin restorations shrink after curing