Restorative Ii Week 1 Ppt - Tofflemire Matrix, Bands, And Wedges

Front 1

What is used to create artificial surfaces for cavity preparations that require the removal of one or more proximal surfaces of the tooth?

Back 1

A matrix band and matrix retainer.

Front 2

What are commonly referred to as a matrix?

Back 2

The band and retainer together.

Front 3

What is used with a matrix to help hold the band to the tooth and adapt it to the gingival margin of preparations involving removal of proximal surfaces?

Back 3

A wedge.

Front 4

What is the term used to refer to the band and retainer?

Back 4

The matrix

Front 5

What are the 4 functions of the matrix?

Back 5

1. replaces a missing wall or walls or wall(s) of a cavity preparation.

2. re-establishes normal contour of the missing wall or walls.

3. restores correct proximal contact relation of the missing wall or walls.

4. keeps excess restorative material away from the gingival margin of the restoration.

Front 6

What are the 3 qualities of a matrix?

Back 6

1. easy application and removal.

2. should not be costly or time consuming to prepare.

3. Stable enough to withstand the stress of inserting restorative material into the preparation.

Front 7

What are the 3 types of matrices?

Back 7

1. Tofflemire matrix.

2. Strip matrix.

3. Custom matrix.

Front 8

What is the definitions of the tofflemire matrix?

What is it made up of?

Back 8

* Most widely used matrix for class II preparations.

* Made up of two components: tofflemire retainer and the matrix band.

Front 9

What is the definition of the strip matrix?

What is it made up of?

Back 9

* thin transparent strip matrix is the most widely used form of matrix of a class III preparation being restored with tooth colored material.

* the strip is the band and the operator's fingers are the retainer.

Front 10

What is the definition of the custom matrix?

Back 10

* best suited for class II amalgam restorations where the tofflemire matrix is difficult to adapt.

* it is more rigid than commercial matrix, provides better contact and contour, and results in less carving of the proximal surfaces.

Front 11

What are 3 advantages of a tofflemire?

Back 11

1. when properly applied, the tofflemire meets most of the criteria for an ideal matrix

2. it provides a satisfactory fit and seal at the gingival and proximal margins of the restoration.

3. Fairly stable once positioned and easy to remove once procedure is completed.

Front 12

What are two disadvantages of a toflemire?

Back 12

1. the band is flat and must be shaped to duplicate the contour and contact area of the tooth being restored.

2. the fresh amalgam on the proximal surface of the restoration requires more carving that those restored with custom matrix bands that adapt to the proximal more ideally.

Front 13

How many different matrix bands are commonly used with the tofflemire retainer?

How many will we use?

Back 13

* 8 different bands are used with the tofflemire retainer.

* we will only use two.

Front 14

What are matrix bands made of?

How many different lengths do they come in?

Back 14

* they are made of stainless steel

* they are all approximately the same length.

Front 15

In what ways do matrix bands differ?

Back 15

Differ most in the configuration of one edge and their width.

Front 16

What band is most common?

What band has an extension gingivally for larger preps?

Back 16

1. the universal #1.

2. the #2.

Front 17

Back 17

Front 18

What is the definition of a wedge?

Back 18

* a small round or triangular-shaped piece of wood or plastic which is used with the matrix.

Front 19

Where is a wedge placed?

Back 19

* against the band at the proximal gingival margins of the preparation.

Front 20

What are the 3 commonly used wedges?

Back 20

1. Round toothpick.

2. Trimmed cotton tip applicator stick or match stick.

3. Commercially prepared triangular-shaped wedges.

Front 21

What are the 3 functions of the wedge?

Back 21

1. Helps stabilize the band.

2. Prevents excess restorative material (overhang) at the proximal gingival margin of the preparation by holding the band tightly to the preparation at the gingival margin.

3. Wedging separates the teeth enough to compensate for the thickness of the band. This ensures a tight contact relationship after the band is removed.

Front 22

What happens if the gingival floor or a prep is not tightly sealed?

Back 22

Restorative material will seep out from the matrix band and will create overhangs.

Front 23

What is the first step to placing the band in the tofflemire retainer?

Back 23

1. The locking vise should start 1/4 inch from the guide channel (adjust with adjusting nut).

Front 24

What is the second step to placing the band in the tofflemire retainer?

Back 24

2. Make sure the pointed spindle is clear of the slot in the locking vise (otherwise you won't be able to get your band in).

Front 25

What is the third step to placing the band in the tofflemire retainer?

Back 25

3. Bring the ends of the band together and determine which end is the occlusal and gingival edge ** retainer is placed on buccal side of teeth with open side of guide channels toward the gingiva.

Front 26

What is the fourth step to placing the band in the tofflemire retainer?

Back 26

4. Place the larger occlusal edge into the locking vise groove, the guide channel closest to the locking vise, and the appropriate end guide channel in one motion.

Front 27

What is the fifth step to placing the band in the tofflemire retainer?

Back 27

5. Once the band is in position, turn the small locking nut clockwise to secure the band in the retainer.

Front 28

What are the 4 steps involved in placing the tofflemire matrix on the tooth?

Back 28

1. expand the band loop.

2. adjust the loop size.

3. place the band on the tooth.

4. check and adjust the band fit.

Front 29

What is the first step in placing the band on the tooth.

Back 29

1. Expand and round the loop formed by the band. Place the handle of an instrumend on the inner surface of the loop and the thumb on the outer surface of the band. Round by applying pressure with the instrument towards your thumb as your move the instrument around the loop. ** wear gloves and be careful not to cut yourself!

Front 30

What is the second step in placing the band on the tooth.

Back 30

2. Try the band on the tooth. If the loop is too small, turn the adjusting nut counter-clockwise.

Front 31

What is the third step in placing the band on the tooth.

Back 31

3. Position the gingival edge of the band in the gingival crevice below the gingival margin about 1-2 mm.

Front 32

What is the fourth step in placing the band on the tooth.

Back 32

4. Check that the rubber dam is not caught between the band and the gingival margin.

Front 33

What is the fifth step in placing the band on the tooth.

Back 33

5. Check to see if the slotted edge of the retainer is directed toward the gingiva (makes it so the retainer can be removed in an occlusal direction once procedure is complete).

Front 34

What is the sixth step in placing the band on the tooth.

Back 34

6. Once positioned correctly, tighten the band on the tooth by turning the adjusting nut clockwise and check the relationship of the band to the occlusal and gingival margin of the cavity prep.

Front 35

How far beyond the margin should the band extend?

Back 35

1-2 mm beyond both the gingival and occlusal margins.

Front 36

What are the two functions of the wedge?

Back 36

1. Keeps matrix band tight to the tooth at the proximal gingival margin of the cavity prep. Helps to prevent overhang.

2. Separates the teeth enough to compensate for the thickness of the band and ensure a tight contact after the matrix is removed.

Front 37

What is the first step in placing the wedge?

Back 37

1. Examine the proximal(s) to be wedged and determine which embrasure (facial or lingual) is largest.

** the wedge is seated in the larger of the two.

Front 38

Which embrasure is largest in most patient's mouths?

Back 38

The lingual embrasure is largest

Front 39

What is the second step in placing the wedge?

Back 39

2. Grasp the larger end of the wedge with cotton pliers and insert the pointed end into the largest embrasure.

Front 40

In which direction is a triangular shaped wedge placed?

Back 40

* For triangular shaped wedges, the flat base is directed toward the gingival and the point is toward the contact area.

Front 41

What should you do if the wedge is difficult to insert?

Back 41

* Try pushing it with an amalgam condenser or end of the cotton pliers.

Front 42

What should you do if the wedge won't fit easily into the embrasure?

Back 42

* Use a smaller wedge, modify or trim the wedge, or apply from the opposite embrasure.

Front 43

When should you force a wedge?

Back 43

* DO NOT force a wedge. This can damage the interdental papilla.

Front 44

What will happen if the wedge, or any part of it, is occlusal to the gingival margin of the preparation?

Back 44

* The band will be pressed in toward the cavity.

Front 45

What should you do if the contour is incorrect after placing the wedge?

Back 45

* Remove the wedge and re-contour the band if any dent was made.

Front 46

What does this image depict?

Back 46

* Proper selection and positioning of wedge results in normal contour of the proximal surface amalgam.

Front 47

What does this image depict?

Back 47

* Untrimmed wedge encroaches on proximal contact area, causing flat, undercontoured surface. High wedge interferes with burnishing/ contouring of the matrix band. Proximal contact is likely to be open, inviting food impaction.

Front 48

What does this image depict?

Back 48

* Diminutive wedge may lead to overcontouring of proximal surface and gingival inflammation. The amalgam can be carved to contour, but with difficulty.

Front 49

What should be checked after placing the matrix?

Back 49

* Ensure that the band is seated tightly to the proximal gingival margin of the cavity preparation with an explorer.

Front 50

What should be done after placing the band to get better adaptation?

Back 50

* Burnish the band against the adjacent tooth to get better adaptation of the band.

Front 51

What should be checked of the band and the contact? What will this prevent?

Back 51

* Check the contour of the band and the contact; there should be no space between the band and the tooth at the gingival seat. This will prevent amalgam overhang.

Front 52

What does the large inner knob do?

Back 52

* Adjusts the tightness of the band.

Front 53

What does the small outer knob do?

Back 53

Locks the matrix band in the matrix retainer.

Front 54

Back 54

Front 55

What end of the matrix band goes into the tofflemire first?

Back 55

* The occlusal end of the band.

Front 56

Which direction should the tofflemire be facing?

Back 56

Out of the mouth from the buccal/facial surface of the tooth.