operative questions Flashcards by Madyson Flax

Forming the hybrid layer consists of?
a. Acid etch
b. Rinsing tooth
c. Adhesive
d. Curing
e. All the above

all

How well did you know this?

Not at all

Perfectly

What is the sequence of reactions for polymerization reaction?

activation
initation
propagation
termination

How well did you know this?

Not at all

Perfectly

Beveling the gingival floor of a Class II helps with what?

expose enamel rods

How well did you know this?

Not at all

Perfectly

f a patient has a heavy centric occlusion on number eight for a class IV, what should
you do?

do not place lingual bevel

How well did you know this?

Not at all

Perfectly

You should remove all of the following in a class III preparation, except?
a. Gingival contact
b. Facial contact
c. Incisal contact
d. Lingual contact

c. Incisal contact (becomes Class 4)

How well did you know this?

Not at all

Perfectly

Increasing the filler size amount will do what?

increase strength

(and decrease polymerization shrinkage)

How well did you know this?

Not at all

Perfectly

When removing carries, all affected dentin should be removed completely (TRUE or FALSE).

false
remove all infected

How well did you know this?

Not at all

Perfectly

the smear layer consists of what?

debris from bur, bacteria, cells

How well did you know this?

Not at all

Perfectly

Incremental placing of composite in a Class II box will do what?

decreases stress

How well did you know this?

Not at all

Perfectly

acid etching does what to prep

increases SA
and surface energy

(place for resin can penetrate to form resin tags)

How well did you know this?

Not at all

Perfectly

Which would you not use to finish?
a. Pineaapple bur
b. Polishing cup
c. Diamond bur

pineapple

How well did you know this?

Not at all

Perfectly

Which dilutes the resin matrix

TGDMA

How well did you know this?

Not at all

Perfectly

What is the initiator for chemical cure

benzoyl peroxide

How well did you know this?

Not at all

Perfectly

initiator for light cure

camphorquinone

How well did you know this?

Not at all

Perfectly

Procedure of doing a composite in order

etch
bond
finish polish

How well did you know this?

Not at all

Perfectly

You should re-etch when what happens?

prep becomes contaminated with saliva or blood

How well did you know this?

Not at all

Perfectly

Self-etch is more predictable than total-etch (TRUE/FALSE)

false

How well did you know this?

Not at all

Perfectly

How should you prep and restore two adjacent teeth in order if they’re next to each other.

prep large lesion first
restore small lesion first

How well did you know this?

Not at all

Perfectly

T/F enamel wears 25-125 times easier than dentin.

FALSE, dentin wears faster

How well did you know this?

Not at all

Perfectly

2 questions on most likely place where carious lesion are on a class III

lingual and gingival to contact

How well did you know this?

Not at all

Perfectly

Composite sticking to instrument can do what.

create voids

How well did you know this?

Not at all

Perfectly

Flowable for 1st increment of box.

increasing bond/seal
(decreases microleakage)

How well did you know this?

Not at all

Perfectly

Where does Enamel bind stronger to?

enamel rods
NOT SIDES

How well did you know this?

Not at all

Perfectly

coupling agent
couples filler with resin

silane

How well did you know this?

Not at all

Perfectly

what do you remove

smear layer

etching will

increase surface area and surface energy

elastic modulus also means

stiffness

what do you use for class III a. mylar strip b. tofflemire c. clear strip

mylar strip

palodent best used for

small class 2 compo

when more filler is added

increases hardness (and increases strength and decreases shrinkage)

why do you use increments

minimize stress

where are dentin tubules widest

at pulp

why is bonding to dentin harder

dentin more heterogeneous

which agent serves to lower viscosity of comp resin

TEGDMA

best agent to fill abfraction/ class V lesions

nano and micro

what causes irritated tissues

tofflemire

palodent should be palced

1mm above margin of adjacent tooth

what does cure thru matrix do

achieve best contour (used for class v)

how much should you break thru facial contact in class III

.25mm minimally broken

all the following are true about s curves but

make walls diverge

what does methacrylate monomers in bulk fill do

relieve stress (reduces shrinkage stress)

axiopulpal line angle is BEVELED in amalgam to improve

resistance

what do you reccomend to pt with sens

toothpaste with KNO3 aka potassium nitrate-> blocks fluid movement

is it ok to leave unsupported enamel in class III prep

true

what class has highest c factor

class I

reason for doing flowable in bottom of box

improve gingival margin seal

what should you do if you have heavy contact on L of class III

do not bevel

result from comp sticking to tool

voids

softest to hardest

cementum dentin enamel

what do you do before putting on rubber dam

select tooth shade

what teeth isolate

one posterior two anterior

two adjacent preps:

prep largest first restore smallest first

layering technique = incremental placement and creates

less stress

oxygen inhibited layer

kept sticky and wettability to add more comp

gingival inflammation

from improper wedging

what causes gingival irritation

OVERCONTOURED = most damaging to periodontitis

dentin adhesive bonding best described by

collagen and resin interlocked intertubular dentin

pt had DO done on 4. now has cold sensitivity and inflamed gums 1. causing gingivitis 2. cause of cc 3. what should you have done first

1. premature occlusion ( i wanna also say it could be overcontoured on Distal thats causing gingivitis but idk) 2. fluid in dentinal tubules 3. condense box (or maybe prep with better matrix system???)

lower polymerization stress shrinkage means lower c factor. c factor is bonded divided by unbonded surfaces

both true

adhesive solvent used at umkc

ethanol

bonding agent ____bonds to enamel

micromechanical

bonding agent ____bonds to dentin

micromechanical

bonding agent _____bonds to resin

chemicaly

collagen+ resin form; intertubular dentin bond here

hybrid layer

Collagen and resin layer Want to form with dentin Interlocking of resin with demineralized collagen

hybrid layer

tooth flexing and bending

abraction

abfraction affects what portion of tooth

cervical

prismless enamel found where

cervical

bevel for class II

axiopulpal line angle

what leads to most post op sens

bulk fill

what do methacrylate monomers in bulk fill do

relieve stress

why do you flare on cavosurface

to expose ends of enamel rods

why do you NOT bevel

exposure sides of enamel rods

longevity of tooth

fracture toughness

stress on tooth that causes flexure and stress on cervical area of tooth

abfraction

if you dont prepare with long axis of tooth, then what

undefined internal line angles, inadequate retention for composite, pulp damage (but was not option)

bond to smear layer?

flare on cavosurface to expose

ends of enamel rods

advantages of rubber dam

better visualization and access -clean -material works better -prevents injury -prevents injury

goal of adhesive with composite in enamel: in dentin:

enamel: interlocking with enamel rods dentin: interlocking with dentin collagen

etch and rinse (total etch) explained

1. 3 steps, 2 bottles 1. etch 2. prime 3. bond or 1. etch 2. prime+ bond (UMKC method) *stronger bond *enamel ADEQUATELY PREPARED

self-etch explained

1. 2 steps, 1 bottle 1. acid primer + bonding agent -acid primer partially dissolves smear layer, allows penetration of bond resin (basically just one thing) *will not etch unprepared enamel *lower bond strength

perpendicular oriented enamel

1. cavosurface margins of class I prep 2. bevels of class II prep 3. ends of enamel rods

parallel oriented enamel

1. internal walls of occlusal preps 2. gingival floor of box of class II preps 3. sides of enamel rods

ideal occlusion

posterior teeth axial loading =load long axis of tooth

max and mand functional and nonfunctional cusps

max functional: lingual non: buccal mand functional: buccal non: lingual

methods to ensure you restore patient's occlusion properly

1. check occlusion with marking paper BEFORE anesthetizing recreate it 2. visually evaluate contralateral side to where working on 3. check occlusion again when pt sitting up

if restore wrong what happens to occlusion

1. pain biting 2. fractured cusp 3. fractured restoration 4. premature contact 5. trauma on pdl 6. trauma to TMJ

different components of dental composite resin

1. resin matrix 2. filler particles 3. silane coupling agent

for regular composite, what are the difunctional monomers and which dilutes

1. bis-GMA 2. UDMA 3. TEGDMA- this dilutes (less viscous)

coupling agent (silane) creates better stress distribution betwen

resin and filler

flowable bulk fill is in ___only fullbody bulk fill in is

flowable- dentin only fullbody- dentin and enamel

4 types of sealants

1. resin based 2. glass ionomer 3. polyacid-modified resin 4. resin-modified glass ionomer

describe resin based sealant

most common not moisture friendly

describe glass ionomer sealant

moisture friend poor retention but more working time fluoride releasing

describe polyacid-modified resin

resin base with fluoride releasing and adhesive properties of glass ionomer continuously releasing fluoride moisture sens

describe resin-modified glass ionomer

glass ionomer with resin components longer working time

with sealants you need a dry environment (especially for resin based) and clean area do what and not do what to clean

do: use pumice and prophy brush, air, enameloplasty DONT: use prophy paste

preventive resin restoration PRR is done on: sealants are done on:

PRR- initial caries present (cant be in dentin) sealants - noncavitated teeth

active ingredient in sensitivity toothpastes

potassium nitrate (KNO-gunpowder)

3 different non-carious causes of class V lesions

1. erosion- acid, gerd, bulimia 2. abrasion- wear, toothbrush, bruxism 3. abfraction- flexure of tooth, mechanical loss of tooth structure

class III dimensions for central and lateral tooth M-D and G-I

central M-D 1.5mm G-I 2.0mm lateral M-D 1.0mm G-I 1.5mm

retention for class III

incisal point gingival groove (

contacts of class III

incisal= intact gingival=broken facial= 0.25mm minimally broken

class V prep

walls diverge axial wall convex bevel (increases SA retention and reduces microleakages) add retention grooves

causes of tooth sensitivity

1. caries or leaky restoration 2. voids-> fluid flows into voids 3. premature contact 4. exposed dentin->recession 5. post-perio surgery 6. abrasion and erosion

use Myler strip finish when

in class III (matric and wedge)

use this for added retention when cant bevel in class III

dovetail lock