Question 1

An advantage of the automatrix system over the universal retainer is the automatrix system:

Accepted Answer

A) is available in various sizes. 
B) needs no retainer to hold the band in place. 
C) does not require use of a wedge. 
D) requires no tightening of the band. 
A) is available in various sizes. 
B) needs no retainer to hold the band in place. 
C) does not require use of a wedge. 
D) requires no tightening of the band. B

Question 2

To create a solid closure of the cavity preparation for posterior composite restorations,the prongs of the tension ring for the Palodent systems are placed _____ the band and wedge.

Accepted Answer

A) distal to 
B) between 
C) mesial to 
D) buccal to 
A) distal to 
B) between 
C) mesial to 
D) buccal to B

Question 3

A(n) _____ Tofflemire retainer has been designed with a slight bend in the body to accommodate positioning from the lingual surface.

Accepted Answer

A) automatrix 
B) Palodent-type matrix band 
C) contra-angle 
D) spot-welded band 
A) automatrix 
B) Palodent-type matrix band 
C) contra-angle 
D) spot-welded band C

Question 4

The material of choice for a posterior matrix band is::

Accepted Answer

A) thin, flexible stainless steel. 
B) thick, rigid stainless steel. 
C) celluloid. 
D) thin, flexible copper. 
A) thin, flexible stainless steel. 
B) thick, rigid stainless steel. 
C) celluloid. 
D) thin, flexible copper.

Question 5

Once the automatrix band is positioned on the tooth,a tightening wrench is inserted into the coil and turned:

Accepted Answer

A) counterclockwise to tighten the band. 
B) until the coil is snug around the tooth. 
C) clockwise to tighten the band. 
D) to form the contour around the tooth. 
A) counterclockwise to tighten the band. 
B) until the coil is snug around the tooth. 
C) clockwise to tighten the band. 
D) to form the contour around the tooth.

Question 6

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

Question 7

A matrix must be used to create a temporary wall for which of the following classifications of tooth restoration?

Accepted Answer

A) Class I and class V 
B) Class II and class IV 
C) Class II and class III 
D) Both b and c 
A) Class I and class V 
B) Class II and class IV 
C) Class II and class III 
D) Both b and c

Question 8

The purpose of contouring a matrix band is to:

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.

Question 9

The _____ is used as a matrix system for the primary molars.

Accepted Answer

A) T-band 
B) automatrix 
C) spot-welded band 
D) either a or c 
A) T-band 
B) automatrix 
C) spot-welded band 
D) either a or c

Question 10

To contour an anterior matrix band,pull the matrix lengthwise over a rounded surface such as a(n):

Accepted Answer

A) mirror handle. 
B) explorer. 
C) scaler. 
D) none of the above. 
A) mirror handle. 
B) explorer. 
C) scaler. 
D) none of the above.

Question 11

Which of the following statements is true of posterior metal matrix bands?

Accepted Answer

A) The smaller circumference of the band is the occlusal edge. 
B) The smaller circumference is placed toward the gingival edge. 
C) The larger circumference of the band is the gingival edge. 
D) The edge of the band is contoured in the proximal contact area. 
A) The smaller circumference of the band is the occlusal edge. 
B) The smaller circumference is placed toward the gingival edge. 
C) The larger circumference of the band is the gingival edge. 
D) The edge of the band is contoured in the proximal contact area.

Question 12

The larger side of the universal matrix band loop is always toward the____ third of the tooth.

Accepted Answer

A) gingival 
B) incisal 
C) occlusal 
D) buccal 
A) gingival 
B) incisal 
C) occlusal 
D) buccal

Question 13

What is the correct order of steps for preparing the T-band matrix?
1)Close the wings and pull the free end to make a small loop of the band.
2)Holding the free end of the band toward the facial,place the band loop on the tooth.
3)Bend the wings of the T-band to form a U-shape.
4)Slip the free end of the band through the U formation.

Accepted Answer

A) 1, 2, 3, 4 
B) 2, 3, 4, 1 
C) 3, 4, 1, 2 
D) 1, 3, 4, 2 
A) 1, 2, 3, 4 
B) 2, 3, 4, 1 
C) 3, 4, 1, 2 
D) 1, 3, 4, 2

Question 14

Which statement is not true 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 15

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 16

Which statement is true 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 true 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 true statements.

Question 17

The universal,or Tofflemire,retainer holds the matrix band snugly in position and is most often positioned:

Accepted Answer

A) toward the anterior of the mouth. 
B) on the buccal surface of the tooth being restored. 
C) on the lingual surface of the tooth being restored. 
D) toward the posterior of the mouth. 
A) toward the anterior of the mouth. 
B) on the buccal surface of the tooth being restored. 
C) on the lingual surface of the tooth being restored. 
D) toward the posterior of the mouth.

Question 18

Mylar strips are used for class ___ restorations.

Accepted Answer

A) I 
B) III 
C) V 
D) II 
A) I 
B) III 
C) V 
D) II

Question 19

Excess restorative material that extends beyond the cavity margin is a/(n):

Accepted Answer

A) overhang. 
B) celluloid. 
C) cupping. 
D) diastema. 
A) overhang. 
B) celluloid. 
C) cupping. 
D) diastema.

Question 20

To contour a metal matrix band for posterior teeth,place the band on a paper pad and rub the inner surface of the band with _____ until the ends begin to curl.

Accepted Answer

A) a ball-point pen 
B) a burnisher or the end of a mirror handle 
C) a pencil eraser 
D) your finger 
A) a ball-point pen 
B) a burnisher or the end of a mirror handle 
C) a pencil eraser 
D) your finger

Exam 49: Matrix Systems for Restorative Dentistry

An advantage of the automatrix system over the universal retainer is the automatrix system:

To create a solid closure of the cavity preparation for posterior composite restorations,the prongs of the tension ring for the Palodent systems are placed _____ the band and wedge.

A(n) _____ Tofflemire retainer has been designed with a slight bend in the body to accommodate positioning from the lingual surface.

The material of choice for a posterior matrix band is::

Once the automatrix band is positioned on the tooth,a tightening wrench is inserted into the coil and turned:

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

A matrix must be used to create a temporary wall for which of the following classifications of tooth restoration?

The purpose of contouring a matrix band is to:

The _____ is used as a matrix system for the primary molars.

To contour an anterior matrix band,pull the matrix lengthwise over a rounded surface such as a(n):

Which of the following statements is true of posterior metal matrix bands?

The larger side of the universal matrix band loop is always toward the____ third of the tooth.

Which statement is not true concerning placement of the matrix retainer and band?

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

Which statement is true concerning wedges?

The universal,or Tofflemire,retainer holds the matrix band snugly in position and is most often positioned:

Mylar strips are used for class ___ restorations.

Excess restorative material that extends beyond the cavity margin is a/(n):

To contour a metal matrix band for posterior teeth,place the band on a paper pad and rub the inner surface of the band with _____ until the ends begin to curl.

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

Communication in the Dental Office