Matrix for Direct Restorations Flashcards

1
Q

When to se a matrix?

A

class II, III, IV cavities

as they present missing sections

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2
Q

A well applied matric band should do what?

A
  1. establish a contact point with the neighbouring tooth
  2. confine (box) the cavity to allow the restoration to be built up
  3. stop material being expelled to allow the restoration to be built up
  4. allow for physiological contouring of the cavity box area
  5. influence the surface texture of the restorative material, leaving it as smooth a possible
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3
Q

What are metal matrices made form?

A

stainless steel

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4
Q

What are the 2 most common types of matrices used?

A

Tofflemire

Siqveland

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5
Q

What material are sectional matrices?

A

clear plastic

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6
Q

Do you want the matrix to curve around the tooth?

A

yes and place a wedge

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7
Q

What is the purpose of a wedge?

A

to secure the matrix against the tooth

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8
Q

How do you check the effectiveness of the seal?

A

running a dental explorer between the box floor and matrix

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9
Q

What do you use to change the shape of the matrix

A

round or flat ended amalgam packer to burnish the matrix band

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10
Q

What is a burnisher?

A

used to build out the contour of te matrix from the box floor to the contact point

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11
Q

What is the advantage of the Tofflemire band with deep class II cavities?

A

they have curved area that engages further apically when applied

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12
Q

When placing a siqveland matrix band, what way should the latch face?

A

always be engaged to the cervical side of the tooth

to allow the band to flare coronally better

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13
Q

What is the apical edge of the tofflemire band like?

A

curved - easy to orientate

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14
Q

Where should the curved area of the tofflemire be placed?

A

beyond the box floor

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15
Q

What do you do after applying the matrix band?

A

apply a wedge

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16
Q

What types of material can automatrices come in?

A

metal or clear

17
Q

What loads the automatrix?

A

autoloader

18
Q

What are the 3 parts of a sectional matrix?

A

matrix
security clamp
wedge

19
Q

Why use a sectional matrix?

A

nothing sticks out of the mouth

20
Q

What are 2 reason for the matrix to not reach to the box floor?

A

the cavity extends subgingivally and the matrix is not wide enough or shaped to be positioned beyond the box

the matrix is prevented form being positioned apical to the box floor, due to the side tissue around the remainder at a more coronal position to the box

21
Q
A