Question 1

Which statement(s) is(are) true concerning the purpose of the anterior matrix systems?

Accepted Answer

A) The clear plastic allows the curing light to penetrate the material, completing the curing process. 
B) The matrix protects the adjacent teeth from the materials. 
C) The matrix helps in reconstructing the natural contour of the tooth. 
D) All of the above are true statements. 
A) The clear plastic allows the curing light to penetrate the material, completing the curing process. 
B) The matrix protects the adjacent teeth from the materials. 
C) The matrix helps in reconstructing the natural contour of the tooth. 
D) All of the above are true statements.

Question 2

Which of the statements is not true of the spot-welded band?

Accepted Answer

A) The spot-welded band is a custom fitted band. 
B) The spot-welded matrix band measures ¾" to 1" of copper material. 
C) A #110 pliers is used to adapt the band to ensure the ends of the matrix are at the facial surface. 
D) The matrix is welded at three positions before being placed on the tooth. 
A) The spot-welded band is a custom fitted band. 
B) The spot-welded matrix band measures ¾" to 1" of copper material. 
C) A #110 pliers is used to adapt the band to ensure the ends of the matrix are at the facial surface. 
D) The matrix is welded at three positions before being placed on the tooth.

Question 3

When a posterior metal matrix band and retainer are placed,the seated matrix band should extend approximately _____ mm below the gingival margin of the preparation.

Accepted Answer

A) one 
B) three 
C) six 
D) negative two (It should actually be above the margin of the gingival preparation.) 
A) one 
B) three 
C) six 
D) negative two (It should actually be above the margin of the gingival preparation.)

Question 4

The system that is used with posterior composite restorations is the:

Accepted Answer

A) automatrix. 
B) Tofflemire. 
C) T-band. 
D) Palodent. 
A) automatrix. 
B) Tofflemire. 
C) T-band. 
D) Palodent.

Question 5

If there is a loss of a cusp making the preparation deeper,a(n) _____ band may be selected.

Accepted Answer

A) universal 
B) copper 
C) Palodent 
D) extension 
A) universal 
B) copper 
C) Palodent 
D) extension

Question 6

The component of the universal matrix retainer that holds the matrix band securely in the device is the:

Accepted Answer

A) spindle. 
B) guide channels. 
C) inner knob. 
D) diagonal slot. 
A) spindle. 
B) guide channels. 
C) inner knob. 
D) diagonal slot.

Question 7

Stainless steel matrices cannot be used for anterior composite resins because the:

Accepted Answer

A) resins can be scratched by the stainless steel. 
B) stainless steel can interfere with the setting of the resins. 
C) stainless steel can stain the color of the resin. 
D) both a and b. 
A) resins can be scratched by the stainless steel. 
B) stainless steel can interfere with the setting of the resins. 
C) stainless steel can stain the color of the resin. 
D) both a and b.

Question 8

The component of a universal matrix retainer that serves to guide the direction of the matrix loop according to the quadrant that is being treated is the:

Accepted Answer

A) spindle. 
B) outer guide slots. 
C) inner knob. 
D) diagonal slot. 
A) spindle. 
B) outer guide slots. 
C) inner knob. 
D) diagonal slot.

Question 9

If a patient is having a class V restoration on the lower left first molar,what type of matrix system would be used?

Accepted Answer

A) Tofflemire matrix with a wedge 
B) Automatrix system 
C) Mylar system 
D) None of the above 
A) Tofflemire matrix with a wedge 
B) Automatrix system 
C) Mylar system 
D) None of the above

Question 10

The _____ is used for anterior composite resin or glass ionomer restorations.

Accepted Answer

A) automatrix 
B) clear plastic matrix 
C) Tofflemire 
D) T-band 
A) automatrix 
B) clear plastic matrix 
C) Tofflemire 
D) T-band

Question 11

The component of the universal matrix retainer that is always positioned in the mouth facing the gingiva is the:

Accepted Answer

A) spindle. 
B) outer guide slot. 
C) inner knob. 
D) diagonal slot. 
A) spindle. 
B) outer guide slot. 
C) inner knob. 
D) diagonal slot.

Question 12

For posterior restorations,the wedge is positioned from the _____ side.

Accepted Answer

A) facial 
B) lingual 
C) buccal 
D) labial 
A) facial 
B) lingual 
C) buccal 
D) labial

Question 13

The purpose of a matrix system is to:

Accepted Answer

A) retain and support the restoration. 
B) provide a temporary interproximal wall for the restorative material. 
C) create an external surface against which the restorative material is packed. 
D) both b and c. 
A) retain and support the restoration. 
B) provide a temporary interproximal wall for the restorative material. 
C) create an external surface against which the restorative material is packed. 
D) both b and c.

Question 14

The most common matrix system used for class II posterior restorations is the:

Accepted Answer

A) Tofflemire retainer and matrix band. 
B) clear plastic matrix. 
C) T-band matrix. 
D) automatrix system. 
A) Tofflemire retainer and matrix band. 
B) clear plastic matrix. 
C) T-band matrix. 
D) automatrix system.

Exam 49: Matrix Systems for Restorative Dentistry

Which statement(s) is(are) true concerning the purpose of the anterior matrix systems?

Which of the statements is not true of the spot-welded band?

When a posterior metal matrix band and retainer are placed,the seated matrix band should extend approximately _____ mm below the gingival margin of the preparation.

The system that is used with posterior composite restorations is the:

If there is a loss of a cusp making the preparation deeper,a(n) _____ band may be selected.

The component of the universal matrix retainer that holds the matrix band securely in the device is the:

Stainless steel matrices cannot be used for anterior composite resins because the:

The component of a universal matrix retainer that serves to guide the direction of the matrix loop according to the quadrant that is being treated is the:

If a patient is having a class V restoration on the lower left first molar,what type of matrix system would be used?

The _____ is used for anterior composite resin or glass ionomer restorations.

The component of the universal matrix retainer that is always positioned in the mouth facing the gingiva is the:

For posterior restorations,the wedge is positioned from the _____ side.

The purpose of a matrix system is to:

The most common matrix system used for class II posterior restorations is the:

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