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Direct Restoration > Fall Lecture 3: Matrix Systems for Amalgam Restorations > Flashcards

Fall Lecture 3: Matrix Systems for Amalgam Restorations Flashcards

1
Q

Occlusal portion of matrix band should be here:

A

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

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2
Q

Gingival portion of band should extend:

A

0.5mm below gingiva

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3
Q

Proper hugging of band around tooth allows for:

A

proper amalgam condensation and contour developement

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4
Q

Which knob tightens the matrix band?

A

long, inner knob

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5
Q

Do this after wedge placement:

A

turn knob 1/4 turn to loosen

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6
Q

How to get proper contact area with adjacent tooth?

A

Burnish the band

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7
Q

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

A

proper confinement of amalgam with matrix band

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8
Q

Hidden margin in Class 2 restoration:

A

proximal gingival margin

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9
Q

4 parts of Tofflemire:

A

Head, vise/ slide, rotating spindle, set screw

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10
Q

Two types of the Tofflemire retainer

A

straight and contra-angled (lingual placement of band)

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11
Q

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

A

head angulation

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12
Q

2 types of Tofflemire bands:

A

flat, precontoured

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13
Q

Types of flat bands:

A

No. 1, 2, 3, 13

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14
Q

Universal band:

A

No. 1

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15
Q

MOD band:

A

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

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16
Q

How are flat bands categorized?

A

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

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17
Q

Benefit of thicker bands:

A

resist deformation during condensation

18
Q

When to burnish the matrix band:

A

before placing in the matrix band retainer and after placing band

19
Q

Place wedge before or after tightening the matrix band?

A

before

20
Q

When might a band need to be trimmed?

A

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

21
Q

2 rules for correct placement of matrix system:

A

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

22
Q

Issues that could arise if matrix band is too tight:

A

open contact, hinder condensation into proximal cavosurface margin areas.

23
Q

Post placement burnishing is done with:

A

a ball burnisher

24
Q

Other matrix systems:

A

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

25
Q

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

A

ask

26
Q

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

A

gingivaly

27
Q

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

A

up

28
Q

The rotating spindle changes:

A

adjust distance bw slide and head

29
Q

Locks and unlocks the matrix band:

A

set screw

30
Q

When to use a contra-angled Tofflemire:

A

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

31
Q

Most commonly used Tofflemire matrix band:

A

No. 1, universal

32
Q

Difference bw No.2 and No.3 bands:

A

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

33
Q

Tofflemire band to use when doing a Class 2 restoration:

A

0.0010 inches

34
Q

Beware of this when using a precontoured band:

A

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

35
Q

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

A

depth of gingival cavosurface margin

36
Q

What do we check after placing the wedge?

A

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

37
Q

Bands to use for deep subgingival restorations:

A

bands with extensions

38
Q

Turn this to decrease the size of the matrix band:

A

rotating spindle

39
Q

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

A

helps clear any unsupported enamel

40
Q

Bands good for complex restorations or amalgam core build ups:

A

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

41
Q

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

A

DeNovo Band System

42
Q

Simple, inexpensive band system

A

T band system

Direct Restoration (23 decks)

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