Question 1

If a cusp is lost during preparation,which matrix band would provide the best support while restoring?

Accepted Answer

A) Universal 
B) Copper 
C) Palodent 
D) Extension 
A) Universal 
B) Copper 
C) Palodent 
D) Extension D

Question 2

Why is a matrix band contoured prior to placing the restorative material?

Accepted Answer

A) Ensure that the band will fit the tooth being restored. 
B) Curl the band to make it easier to fit the tooth. 
C) Ensure that the final restoration will have proper contact with the adjacent tooth. 
D) Ensure that there is no cupping of the final restoration. 
A) Ensure that the band will fit the tooth being restored. 
B) Curl the band to make it easier to fit the tooth. 
C) Ensure that the final restoration will have proper contact with the adjacent tooth. 
D) Ensure that there is no cupping of the final restoration. C

Question 3

Which matrix system used for class II posterior restorations is the most common?

Accepted Answer

A) Tofflemire retainer and universal band 
B) Clear Mylar matrix 
C) T-band matrix 
D) AutoMatrix system 
A) Tofflemire retainer and universal band 
B) Clear Mylar matrix 
C) T-band matrix 
D) AutoMatrix system A

Question 4

Which statement is correct regarding posterior metal matrix bands?

Accepted Answer

A) The smaller circumference of the band is placed toward the occlusal. 
B) The smaller circumference is placed toward the gingiva. 
C) The larger circumference of the band is the gingiva. 
D) Both ends of the band need to be contoured. 
A) The smaller circumference of the band is placed toward the occlusal. 
B) The smaller circumference is placed toward the gingiva. 
C) The larger circumference of the band is the gingiva. 
D) Both ends of the band need to be contoured.

Question 5

Which matrix system that is used with posterior composite restorations?

Accepted Answer

A) AutoMatrix 
B) Tofflemire 
C) T-band 
D) Palodent 
A) AutoMatrix 
B) Tofflemire 
C) T-band 
D) Palodent

Question 6

Which of the statements is incorrect about a spot-welded band?

Accepted Answer

A) The spot-welded band is a custom fitted band. 
B) The spot-welded band measures 3/4 to 1 inch 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 band measures 3/4 to 1 inch 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 7

What is the material of choice for a universal matrix band?

Accepted Answer

A) Thin, flexible stainless steel 
B) Thick, flexible stainless steel 
C) Celluloid 
D) Thin, flexible copper 
A) Thin, flexible stainless steel 
B) Thick, flexible stainless steel 
C) Celluloid 
D) Thin, flexible copper

Question 8

What is the component of the universal matrix retainer that holds the matrix band securely in the device called?

Accepted Answer

A) Spindle 
B) Guide channel 
C) Inner knob 
D) Diagonal slot 
A) Spindle 
B) Guide channel 
C) Inner knob 
D) Diagonal slot

Question 9

The ______ is used to decrease the size of the matrix band loop after the band has been placed on the tooth.

Accepted Answer

A) spindle 
B) outer knob 
C) inner knob 
D) guide channel 
A) spindle 
B) outer knob 
C) inner knob 
D) guide channel

Question 10

Which statement is correct concerning wedges?

Accepted Answer

A) A wedge is used to apply pressure to the apical and gingival walls of the preparation. 
B) The wedge presses the band against the tooth, causing a slight separation of the teeth. 
C) The most commonly used type of wedge is the rounded plastic form. 
D) Both a and b are correct statements. 
A) A wedge is used to apply pressure to the apical and gingival walls of the preparation. 
B) The wedge presses the band against the tooth, causing a slight separation of the teeth. 
C) The most commonly used type of wedge is the rounded plastic form. 
D) Both a and b are correct statements.

Question 11

What is one advantage of an AutoMatrix over a universal matrix?

Accepted Answer

A) Available in various sizes 
B) No retainer to hold the band in place 
C) Does not require use of a wedge 
D) Requires no tightening of the band 
A) Available in various sizes 
B) No retainer to hold the band in place 
C) Does not require use of a wedge 
D) Requires no tightening of the band

Question 12

Once the AutoMatrix band is positioned on the tooth,how is the band tightened?

Accepted Answer

A) A wrench turns the coil counterclockwise to tighten the band. 
B) Use fingers to turn the coil until it is snug. 
C) A wrench turns the coil clockwise to tighten the band. 
D) It is wedged to form the contour. 
A) A wrench turns the coil counterclockwise to tighten the band. 
B) Use fingers to turn the coil until it is snug. 
C) A wrench turns the coil clockwise to tighten the band. 
D) It is wedged to form the contour.

Question 13

Why should stainless steel matrix bands not be used with composite resin materials?

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 are correct. 
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 are correct.

Question 14

For there to be a solid closure of margins on a posterior composite restoration,where should the prongs of the tension ring for the Palodent system be placed?

Accepted Answer

A) Distal to the band and wedge 
B) Between the band and wedge 
C) Mesial to the band and wedge 
D) Buccal to the band and wedge 
A) Distal to the band and wedge 
B) Between the band and wedge 
C) Mesial to the band and wedge 
D) Buccal to the band and wedge

Question 15

Which statement is incorrect concerning placement of the matrix retainer and band?

Accepted Answer

A) The diagonal slotted surface of the retainer is always toward the gingiva. 
B) The handle of the retainer extends out from the oral cavity at the corners of the lips. 
C) The seated band extends two to three mm above the occlusal surface of the tooth. 
D) The retainer is positioned from the buccal side of the tooth. 
A) The diagonal slotted surface of the retainer is always toward the gingiva. 
B) The handle of the retainer extends out from the oral cavity at the corners of the lips. 
C) The seated band extends two to three mm above the occlusal surface of the tooth. 
D) The retainer is positioned from the buccal side of the tooth.

Question 16

The larger side of the universal matrix band loop is always directed toward which part of the tooth?

Accepted Answer

A) Gingival one third 
B) Incisal one third 
C) Occlusal one third 
D) Buccal one third 
A) Gingival one third 
B) Incisal one third 
C) Occlusal one third 
D) Buccal one third

Question 17

If a patient is having a class V restoration on the lower left first molar,which 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 18

What is the component of the universal matrix retainer that is always positioned in the mouth facing the gingiva called?

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 19

Which of the following is the instrument of choice when positioning a wooden wedge?

Accepted Answer

A) Amalgam carrier 
B) Mouth mirror 
C) Howe pliers 
D) Cowhorn explorer 
A) Amalgam carrier 
B) Mouth mirror 
C) Howe pliers 
D) Cowhorn explorer

Question 20

Where is the wedge positioned when placing a posterior restoration?

Accepted Answer

A) Facial 
B) Lingual 
C) Buccal 
D) Labial 
A) Facial 
B) Lingual 
C) Buccal 
D) Labial

Exam 49: Matrix Systems for Restorative Dentistry

If a cusp is lost during preparation,which matrix band would provide the best support while restoring?

Why is a matrix band contoured prior to placing the restorative material?

Which matrix system used for class II posterior restorations is the most common?

Which statement is correct regarding posterior metal matrix bands?

Which matrix system that is used with posterior composite restorations?

Which of the statements is incorrect about a spot-welded band?

What is the material of choice for a universal matrix band?

What is the component of the universal matrix retainer that holds the matrix band securely in the device called?

The ______ is used to decrease the size of the matrix band loop after the band has been placed on the tooth.

Which statement is correct concerning wedges?

What is one advantage of an AutoMatrix over a universal matrix?

Once the AutoMatrix band is positioned on the tooth,how is the band tightened?

Why should stainless steel matrix bands not be used with composite resin materials?

For there to be a solid closure of margins on a posterior composite restoration,where should the prongs of the tension ring for the Palodent system be placed?

Which statement is incorrect concerning placement of the matrix retainer and band?

The larger side of the universal matrix band loop is always directed toward which part of the tooth?

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

What is the component of the universal matrix retainer that is always positioned in the mouth facing the gingiva called?

Which of the following is the instrument of choice when positioning a wooden wedge?

Where is the wedge positioned when placing a posterior restoration?

History of Dentistry

The Professional Dental Assistant

The Dental Healthcare Team

Dental Ethics

Dentistry and the Law

General Anatomy

General Physiology

Oral Embryology and Histology

Head and Neck Anatomy

Landmarks of the Face and Oral Cavity

Overview of the Dentitions

Tooth Morphology

Dental Caries

Periodontal Disease

Preventive Dentistry

Nutrition

Oral Pathology

Microbiology

Disease Transmission and Infection Prevention

Principles and Techniques of Disinfection

Principles and Techniques of Instrument Processing and Sterilization

Regulatory and Advisory Agencies

Chemical and Waste Management

Dental Unit Waterlines

Ergonomics

The Patient Record

Vital Signs

Oral Diagnosis and Treatment Planning

The Special Needs and Medically Compromised Patient

Principles of Pharmacology

Assisting in a Medical Emergency

The Dental Office

Delivering Dental Care

Dental Hand Instruments

Dental Handpieces and Accessories

Moisture Control

Anesthesia and Pain Control

Foundations of Radiography, Radiographic Equipment, and Radiation Safety

Digital Imaging, Dental Film, and Processing Radiographs

Legal Issues, Quality Assurance, and Infection Prevention

Intraoral Imaging

Extraoral Imaging

Restorative and Esthetic Dental Materials

Dental Liners, Bases, and Bonding Systems

Dental Cements

Impression Materials

Laboratory Materials and Procedures

General Dentistry

Fixed Prosthodontics

Provisional Coverage

Removable Prosthodontics

Dental Implants

Endodontics

Periodontics

Oral and Maxillofacial Surgery

Pediatric Dentistry

Coronal Polishing

Dental Sealants

Orthodontics