Class 2 amalgam restorations

Question 1

types of matrix bands

Answer 1

no. 1: no bump

no. 2 has bump

Question 2

purpose of the matrix bands

Answer 2

provides a wall against which one can condense amalgam
re-establish proximal contact of restoration with adjacent tooth
aid in isolation of prep during the fill
containment of amalgam
aid in preventing voids
shape the proximal contours

Question 3

what must be re-established in class II restorations

Answer 3

proximal contour
proximal contact
gingival embrasures
marginal ridge contour and height

Question 4

types of tofflemire Retainers

Answer 4

contra-angle-ingual

straight-buccal

Question 5

parts of tofflemire Retainer

Answer 5

head: part where the matrix band comes out
slide: pulls matrix band in
rotating spindle: rotates to pull on matrix band
Set screw: holds matrix band in place

Question 6

if the slant is to the Right () why put the matrix band going right or left

Answer 6

right: upper right and lower left
left: upper left and lower right

Question 7

what end of the retainer faces the gingiva

Answer 7

the open end

Question 8

function of the wedge

Answer 8

adapts gingival edge of the matrix band against the gingival cavosurface of the prep to prevent flash from squeezing out gingivally
separates the teeth slightly to compensate for thickness of band
stabilize matrix band

Question 9

where is the edge placed

Answer 9

largest embrasure (usually lingual)

Question 10

after matrix band is placed, what is done with it

Answer 10

loosen spindle 1/4 a turn, to remove tension

bunish against the contact of adjacent tooth

Question 11

problem with lots of flash in the proximal contacts

Answer 11

can breakdown bone and inflame the gingiva

Question 12

where does condensation begin in class II preps

Answer 12

in the proximal boxes

Question 13

make of permite C used at osu

Answer 13

high copper (15.4 %)
admixed
low zn (.2%)- hard to get it all out

Question 14

color of pludger in the almalgum means

Answer 14

how much amalgam is there (Purpose is 2 spill (600mg)

Question 15

purpose of trituration

Answer 15

remove oxide coating and wet each particle of allloy with mercury

Question 16

pressure used t condense

Answer 16

5-10 pounds

Question 17

when to use lateral condensation

Answer 17

point angles and wall

hard to reach areas

Question 18

roll of burnishing

Answer 18

a form of final condensatin
removes mercury rich excess at surface
development of occlusal grooves and fossae

Question 19

when burnishing is done

Answer 19

when amalgam is still soft and matrix band still in place

Question 20

how high should the marginal ridge be

Answer 20

rounded and the same height as the adjacent tooth

Question 21

how to remove the matrix band

Answer 21

loosen spindle to relieve tension on the band
loosen set screw until retainer releases band completely
remove retainer, but leave band`

Question 22

detecting voids in the proximal box

Answer 22

use the pigtail explorer

Question 23

orintation of sickle exploreer to carve the marginal ridge

Answer 23

tip always touching the matrix band
parallel to occlusal band: clear matrix band, create marginalridge contour
45 degrees to occlusal: create occlusal embrasures