Operative Flashcards by William Grooms

What base was used in lab

glass ionomer

How well did you know this?

Not at all

Perfectly

3 functions of bases and liners

Pulpal protection
controls inflammation
mechanical barrier

How well did you know this?

Not at all

Perfectly

3 purposes of dental wedges

1) clear space for matrix band
2) prevents overhangs
3) maintains proper margin

How well did you know this?

Not at all

Perfectly

What is the 2-2-2-2 rule

2 mm pin hole depth
2 drill diameters inside DEJ
2 mm length of pin
2 mm amalgam over pin

How well did you know this?

Not at all

Perfectly

When is it necessary to place a pin

when a cusp has been compromised.
-When facial or lingual extension exceeds 2/3 the distance from a primary groove towards the cusp tip.

-When facial-lingual extension of the occlusal preparation exceeds 2/3 the distance between faciolingual cusps

How well did you know this?

Not at all

Perfectly

Where should pin be placed

at the line angles of missing cusps, 2 mm past DEJ

How well did you know this?

Not at all

Perfectly

How many pins should be placed

one per missing cusp

How well did you know this?

Not at all

Perfectly

What kind of pins do we use?

Threaded pins, self-shearing. Minim silver .021/.53 drill. .024/.61 pin

How well did you know this?

Not at all

Perfectly

What size pin drill did we use

.021/.53

How well did you know this?

Not at all

Perfectly

What size pin did we use

.024/.61

How well did you know this?

Not at all

Perfectly

How should the pin drill be oriented

parallel with the root surface

How well did you know this?

Not at all

Perfectly

how long do you triturate

7 seconds

How well did you know this?

Not at all

Perfectly

Condensing time

5 mins

How well did you know this?

Not at all

Perfectly

Carving time

7 mins

How well did you know this?

Not at all

Perfectly

3 functions of matrix band

isolation
contain amalgam
proximal contact

How well did you know this?

Not at all

Perfectly

What should you do if you find caries under cusp

extend prep buccally and pulpally until no caries left. Use base, liner, and CaOH. Restore.

How well did you know this?

Not at all

Perfectly

Indirect pulp cap is used when

within .5 mm of pulp

How well did you know this?

Not at all

Perfectly

function of CaOH

form reparative dentin

How well did you know this?

Not at all

Perfectly

Most commonly used bases

GI and RMGI

How well did you know this?

Not at all

Perfectly

Dentin conditioner

polyacrylic acid

How well did you know this?

Not at all

Perfectly

Liner not compatible with composite

ZOE
B&T

They inhibit polymerization

How well did you know this?

Not at all

Perfectly

Function of dentin conditioner

clean smear layer

leave smear plug

How well did you know this?

Not at all

Perfectly

Outline

placing cavity margins in positions that they will occupy in final prep

How well did you know this?

Not at all

Perfectly

Initial depth

0.2 to 0.8 mm pulpally from the DEJ (usually 0.5mm) - Ideal Pulpal Depth is 0.5 mm past the DEJ and Ideal Axial Depth is 0.5-0.75 past the DEJ, but must
be 1 mm to be able to properly condense

How well did you know this?

Not at all

Perfectly

Resistance form

That shape and placement of the cavity walls that best enable both the restoration and the tooth to withstand, without fracture, masticatory forces delivered in the long axis of the tooth

Retention form

That shape or form of the prepared cavity that resists displacement or removal of the restoration from tipping or lifting forces -Retentive features include: Converging walls, retentive grooves on the axiobuccal and axiolingual line angles of the proximal box

Convenience form

That shape or form of the cavity that provides for adequate observation, accessibility, and ease of operation in preparing and restoring of the cavity

Amalgam brand

Permite C

Amalgam company

SDI

Amalgam type

admixed (lathe cut and spherical particles)

What cap is extended carving time? What's regular?

Green, grey

Color of amalgam plunger indicates

spill size (purple - 2 spill 600 mg)

Low copper amalgam allows for

gamma 2 phase to form. Most corrosion prone

High copper amalgam prevent

gamma 2 phase. Corrosion resistant

What amalgam packs more efficiently

spherical

Amalgam with more strength and less voids

spherical

Amalgam harder to get proximal contact with

spherical

amalgam with low packing density

lathe cut

Higher condensing forces needed for

lathe cut

Liner used when

remaining dentin thickness (RDT) is more than 2 mm

Example of solution liner and % of seal per layer

copal varnish: 1 layer = 55% sealed 2 layers = 85% sealed

Suspension liner is _____ based

water

suspension liner example

Dycal

Cement liner

glass ionomer aka Fuji lining

2 Eugenol liners

ZOE and B&T

ZOE can be reinforced with fillers to create

IRM (intermediate restorative material)

main difference between base and liner

P:L. more P in bases

Bases are used when

RDT is .5-2 mm

old school base mixed on a cool slab

ZnPO4

Why are GI better bases

they adhere to tooth structure, release fluoride, high clinical record of retention, dimensionally stable, biocompatible.

What must you do before applying base

condition dentin to clean away smear layer

GI liner

KetacCem

GI Base

KetacFil

Concave side of band should vace

gingiva

#2 matrix band used for

posteriors with deep proximal surfaces

#1 matrix band used for

routine sized proximal caries

Wider embrasure space

lingual, usually

why burnish band

proximal contact

Condensing amalgam should be completed within

3-4 min

why condense

Bring residual Hg to surface, maintain homogeneity

Oregon 2 condensers are

1 and 1.5 mm

Oregon 4 condenser size

2 and 3 mm

what condenser is good for lathe cut

oregon 2

What condenser is good for spherical

oregon 4

push stroke is used to

define developmental grooves

If there are minimal caries

if remaining dentin thickness (RDT) is more than 2mm, place a liner of two layers of copal varnish to create an 85% seal or place adhesive then fill with amalgam

If there are moderate caries

if remaining dentin thickness (RDT) is 0.5-2 mm and the ideal prep does not remove all carious tissue forcing you to extend laterally until the DEJ and all dentin are non carious, place a base to replace the missing dentin (either GI or ZNPO4) then place a liner (copal varnish or adhesive) before filling

If there are gross caries

extend until DEJ is all non carious and carious dentin is removed BUT leave caries over pulp instead of pulping the tooth

if there are deep caries

if Remaining Dentin Thickness (RDT) is less than 0.5mm and there is no pulp exposure - CaOH (Dycal), Base (GI or RMG), Copal varnish liner, then amalgam

when is sedative restoration used

questionable pulp status

order of procedure if pulped

pulp cap with CaOH, conditioner, Base (RMGI), Copal Varnish, Amalgam

When is quadrant dentistry indicated

multiple lesions in one quadrant, kissing cavities, or if patient is going under

Why aren't teeth restored simultaneously in quadrant dentistry

excessive wedging, chance of open margin, no adjacent marginal ridge for direction

why would isthmus fracture

too shallow pulpal depth

going incisally, three surfaces of Class V prep

gingival wall incisal wall axial floor

How long until u can polish amalgam

24 hrs after placement

working time

5 minutes

describe an open margin

- catches pigtail both directions - Caused by overhang or poor condensation - restoration must be replaced

Describe a flash

- catches pigtail - excess material will chip off and undermine restoration - flash must be carved flush with cavosurface margin

Describe submargin

- catches pigtail - excess material will chip off and undermine restoration - replace restoration if >0.2 mm

2 results of overtrituration

- soupy | - sets early

2 results of undertrituration

- grainy | - decreased strength

weakest phase in low copper amalgam

gamma 2 - results in low corrosion resistance

where do proximal caries appear on posterior tooth

gingival to contact

ideal pulpal depth of prep

.5 mm beyond DEJ

ideal axial depth

.5-.75 mm beyond DEJ