Fall Lecture 3: Matrix Systems for Amalgam Restorations

Question 1

Occlusal portion of matrix band should be here:

Answer 1

1.5 - 2mm above marginal ridge of adjacent tooth and cavosurface margin, proper condensation of amalgam in margin ridge area

Question 2

Gingival portion of band should extend:

Answer 2

0.5mm below gingiva

Question 3

Proper hugging of band around tooth allows for:

Answer 3

proper amalgam condensation and contour developement

Question 4

Which knob tightens the matrix band?

Answer 4

long, inner knob

Question 5

Do this after wedge placement:

Answer 5

turn knob 1/4 turn to loosen

Question 6

How to get proper contact area with adjacent tooth?

Answer 6

Burnish the band

Question 7

What is required for adequate forces to be applied to the amalgam during condensation?

Answer 7

proper confinement of amalgam with matrix band

Question 8

Hidden margin in Class 2 restoration:

Answer 8

proximal gingival margin

Question 9

4 parts of Tofflemire:

Answer 9

Head, vise/ slide, rotating spindle, set screw

Question 10

Two types of the Tofflemire retainer

Answer 10

straight and contra-angled (lingual placement of band)

Question 11

What are the two types of the Tofflemire retainer based on?

Answer 11

head angulation

Question 12

2 types of Tofflemire bands:

Answer 12

flat, precontoured

Question 13

Types of flat bands:

Answer 13

No. 1, 2, 3, 13

Question 14

Universal band:

Answer 14

No. 1

Question 15

MOD band:

Answer 15

No. 2, deep gingival margins in proximal aspects of tooth

Question 16

How are flat bands categorized?

Answer 16

thickness, 0.0010 (for tight contact, Class 2), 0.0015, and 0.0020

Question 17

Benefit of thicker bands:

Answer 17

resist deformation during condensation

Question 18

When to burnish the matrix band:

Answer 18

before placing in the matrix band retainer and after placing band

Question 19

Place wedge before or after tightening the matrix band?

Answer 19

before

Question 20

When might a band need to be trimmed?

Answer 20

subgingival cavity, trim band in unaffected side of proximal surface of tooth

Question 21

2 rules for correct placement of matrix system:

Answer 21

Open end of retainer head toward gingiva, smaller circumference of band toward gingiva.

Question 22

Issues that could arise if matrix band is too tight:

Answer 22

open contact, hinder condensation into proximal cavosurface margin areas.

Question 23

Post placement burnishing is done with:

Answer 23

a ball burnisher

Question 24

Other matrix systems:

Answer 24

AutoMatrix System (Dentsply), Denovo Matrix System, T-band Matrix

Question 25

Do we only use the matrix systems for amalgam? Different systems for composite?

Answer 25

ask

Question 26

Open side of Tofflemire head should be __ when placed around the tooth:

Answer 26

gingivaly

Question 27

Open side of Tofflemire head should be __ when the band is installed:

Answer 27

up

Question 28

The rotating spindle changes:

Answer 28

adjust distance bw slide and head

Question 29

Locks and unlocks the matrix band:

Answer 29

set screw

Question 30

When to use a contra-angled Tofflemire:

Answer 30

when placing on lingual side of tooth, angulation helps retainer stay up and not in way of incisors when removing, can be tilted to fit around pos teeth while ant portion is angled up and over incisors

Question 31

Most commonly used Tofflemire matrix band:

Answer 31

No. 1, universal

Question 32

Difference bw No.2 and No.3 bands:

Answer 32

Both have projections, 3 is narrower, for premolars, No.2, molars

Question 33

Tofflemire band to use when doing a Class 2 restoration:

Answer 33

0.0010 inches

Question 34

Beware of this when using a precontoured band:

Answer 34

the band must be rotated so the trailing edge does not break shape of marginal ridge when being removed

Question 35

What determines whether you should use a wide or narrow band?

Answer 35

depth of gingival cavosurface margin

Question 36

What do we check after placing the wedge?

Answer 36

Relationship bw the occlusal surface of the wedge and the gingival cavosurface margin, should be above margin

Question 37

Bands to use for deep subgingival restorations:

Answer 37

bands with extensions

Question 38

Turn this to decrease the size of the matrix band:

Answer 38

rotating spindle

Question 39

Added benefit of confirming that the band is well adapted to the gingival cavosurface margin of the restoration:

Answer 39

helps clear any unsupported enamel

Question 40

Bands good for complex restorations or amalgam core build ups:

Answer 40

automatrix system, built in retainer, smaller than Tofflemire retainer, cable derive wrench to tighten around tooth

Question 41

Prewelded band, different sizes, no retainer needed, cut band with bur:

Answer 41

DeNovo Band System

Question 42

Simple, inexpensive band system

Answer 42

T band system