Class V

use of what restoration material should be avoided in the esthetic zone

amalgam

what is the esthetic zone

MB of maxillary 1st molar to the MB of the opposing maxillary 1st molar

Type of lesion that class Vs are

smooth surface

direction of the triangles in a Class V lesion

apex to base at DEJ

(base of triangle in enamel, point at DEJ)

Class V caries are best detected by

visual and tactic evaluation

Where are you looking for Class V lesions

between the height of contour and the gingival margin

If there is a halo present around the Class V lesion, what does that indicate?

demineralization

extensive decay

in a class V lesion, decay can frequently extend

subgingival

extensive class V lesions can indicate ____ that will not become fixed just from restoration

underlying problems (poor hygiene, poor diet, medications)

If there is an ____ lesion in the class V lesion location, there is typically no evidence of decay

abrasion

* is this correct?

5 criteria when determining if a class V abrasive lesion needs restoration

possible pulp exposure

sensitivity issues

esthetics

caries prone

weakened tooth

what is the preparation design for a class V abrasive lesion

bevel the enamel at the incisal

create slots at the gingival

if the class V abrasive lesion is shiny, meaning it is in the dentin, what do you do for the preparation design

use a large round bur on the slow speed to create micro mechanical retention

which tooth structure does not hold bonding well: dentin or enamel

dentin

when would you chose amalgam as your restoration material for a class V lesion

tooth is outside of the esthetic zone

tooth is hard to isolate (back molars)

root surface decay

crown margin repair outside of the esthetic zone

if the class V lesion you are restoring is hard to isolate, but in the esthetic area, what restoration material will you use

RMGI

if the class V lesion you are restoring is a crown margin repair, but in the esthetic area, what restoration material will you use

RMGI

when would you chose RMGI as your restoration material for a class V lesion

lesion is subgingival or root surface

RMGI has tolerance for

moisture

the outline form a cavity preparation is determined by

decay

what is important in a cavity preparation to ensure it has a resistance form

no unsupported enamel

in a class V cavity preparation, when are secondary retention features required for amalgam

incisal and gingival grooves are required both above and below the CEJ

in a class V cavity preparation, when are secondary retention features required for composite

incisal and gingival grooves are required below the CEJ

bevels are recommended above the CEJ

in a class V cavity preparation, when are secondary retention features required for RMGI

incisal and gingival grooves are required below the CEJ

if you are using composite for a class V cavity preparation, when are you able to make rounded line angles

when you are not restoring a lesion on the root surface

how do you ensure resistance in a class V cavity preparation when starting out in the enamel

angle the bur to parallel the enamel rods

what are the preclinical dimensions for the initial class V cavity preparation

'decay' extends between the transitional line angles

2mm incisial wall, 1.5mm gingival wall, 1.5mm height

flare mesial and distal to stay parallel with the enamel rods

4 options for gingival retraction when restoring a class V lesion

retraction cord

electrosurgery

perio flap surgery

212 retraction clamp

at what point in the class V restoration process do you pack the restoration cord

after the preparation is completed

describe the rubber dam application for a class V preparation

same as class I/II except you punch the hole for the lesioned tooth slightly more facial

describe the 212 retraction clamp

2 bows (facial and lingual)

2 jaws (facial and lingual)

describe how you place the 212 retraction clamp

place the lingual jaw first below the height of contour and then pull the facial jaw below the decay and height of contour

how do you stabilize poor 212 clamp stability

green stick compound

how do you apply the green stick compound on the 212 clamp

above and below both of the clamp bows with contact to the tooth underneath the bows

how do you prepare the green stick compound

hold it about 6 inches above a flame until it is warm and appears 'slumped'

place it in warm water to bring down the temperature before application

class V lesion preparation requirements are based on

location of the lesion

walls of the class V preparation must remain parallel to

enamel rods (when above the CEJ)

the minimum depth on the root surface (for retention features) for a class V preparation

axial wall depth of about 0.75-1 mm

2 things that proper axial depth allows

placement of retention grooves entirely in the dentin

avoid pulp exposures

3 things that holding the top of the handpiece parallel to the tooth surface does

uniform depth

uniform contour of the axial wall

90 degree cavosurface angles

what burs do you use on the slow speed to create retention groove entirely in the dentin

1/4 round bur

33.5 or 34 inverted cone

2 hand instruments you can use to plane and remove unsupported enamel for refinement

gingival margin trimmer

enamel hatchet

hand instrument you use to check retention

#17 explorer

what rotary instrument do you use for refinement

slow speed

when extending a class V preparation into the proximal, what two things are required to complete the prep's extension

lingual wall is in sound structure

you are slightly before the contact (preclinical)

when you are above the CEJ for a class V prep, use the ____ as a guide

DEJ

when you are below the CEJ for a class V prep, use the ____ as a guide

1 mm rule

if less than 1 mm exists between class V and III preps, what do you do?

connect the preps

you should prepare and restore class II and V preps

separately

why do you prepare class II and V preps separately

provide a solid surface to condense the amalgam during the class V restoration

how should you pack amalgam into the retention grooves for a class V restoration

add layers a little bit at a time

what is the carving procedure after applying the restoration material in the class V preparation

carve away the incisal and gingival to leave a bulge in the middle of the prep

what are the carving instruments used after applying the restoration material in the class V preparation

hollenback, side of condenser

what are the carving instruments you should NOT use after applying the restoration material in the class V preparation & why?

discoid-cleoid & ball burnishers

will make the surface concave

why can you not use a tofflemire for a class V restoration

prevents access for proper amalgam condensation

when do amalgam and composite need butt joint margins in their preparations

amalgam - above and below the CEJ

composite - below the CEJ

3 burs to use to extend the class V prep into the proximal

round bur, 56, 245 (best option)

when preparing a root surface class V lesion, it is important to place a ___ around the preparation

gingival retention groove

describe the sectional matrix placement

wrap the matrix around the lingual and both proximal surfaces

insert a wedge on both the mesial and distal

can add green stick for further stabilization

what does the sectional matrix help with in a class V amalgam restoration

dense packing and confinement

describe the dentist's seating position for an anterior class V restoration

between 11&1

behind the patient and over their nose

describe the dentist's seating position for a posterior class V restoration

rotate the patient's head to the side

what is Fuji LC capsule

radiopaque light cured reinforced glass ionomer

what class restorations can a Fuji LC capsule be used for

III, V

Sometimes class I (limited)

4 dental procedures you can use a Fuji LC capsule for

primary teeth restoration

core buildup

geriatric applications

base/liner

what part of the tooth is it recommend to not use Fuji LC on

marginal ridges

powder to liquid ratio (g) for Fuji LC

0.33/0.10

mixing time (sec) for Fuji LC

10

working time (minutes & seconds) for Fuji LC

3:15

light curing time (sec) for Fuji LC

20

depth of cure (A2, mm) for Fuji LC

1.8

when using Fuji LC, prepare the tooth using standard techniques and ___ is not necessary

extensive mechanical retention

when using Fuji LC for pulp capping (IF NEEDED ONLY), first place

calcium hydroxide

what is the cavity conditioner of Fuji LC recommended for

removal of smear layer

how to activate the Fuji LC capsule

shake the capsule

tap on side to loosen powder

push plunger for 2 seconds to activate

mix for 10 seconds at high speed

how to properly activate the Fuji LC capsule

fully press the plunger down (prevents incorrect mixing ratio)

right before mixing (use it ASAP after)

how to finish using Fuji LC

water-spray

either with a diamond bur, silicone paint, or polishing strips