Question 1

Which of the following statements correctly describes the pouring methods used to create the base portion of a dental model?

Accepted Answer

A) The art portion of the cast is poured first when the double-pour method is used. 
B) The completed box should extend at least 1 inch above the palatal area of the maxillary impression when the box-and-pour method is used. 
C) The inverted-pour method consists of mixing one large mixture of plaster or stone and pouring both portions of the model in a single step. 
D) The "box" used in the box-and-pour method is made of baseplate wax. 
A) The art portion of the cast is poured first when the double-pour method is used. 
B) The completed box should extend at least 1 inch above the palatal area of the maxillary impression when the box-and-pour method is used. 
C) The inverted-pour method consists of mixing one large mixture of plaster or stone and pouring both portions of the model in a single step. 
D) The "box" used in the box-and-pour method is made of baseplate wax.

Question 2

The dental wax that is used for recording occlusal rims and for denture wax-ups and that is supplied in sheets is called ________ wax.

Accepted Answer

A) bite registration 
B) baseplate 
C) utility 
D) boxing 
A) bite registration 
B) baseplate 
C) utility 
D) boxing

Question 3

When taking a face-bow registration,the vertical indicator rod should be aligned with the patient's:

Accepted Answer

A) midline. 
B) upper first molar. 
C) lower cuspid. 
D) nose. 
A) midline. 
B) upper first molar. 
C) lower cuspid. 
D) nose.

Question 4

The purpose of ________ is to prevent a custom impression tray from sitting too deeply when taking the impression.

Accepted Answer

A) a spacer 
B) stops 
C) undercuts 
D) all of the above 
A) a spacer 
B) stops 
C) undercuts 
D) all of the above

Question 5

When preparing impressions for pouring,it is important to:

Accepted Answer

A) dry the impression completely with a blast of air. 
B) use a gentle stream of air to remove excess moisture. 
C) have the impression saturated with moisture. 
D) leave disinfecting solution in the impression. 
A) dry the impression completely with a blast of air. 
B) use a gentle stream of air to remove excess moisture. 
C) have the impression saturated with moisture. 
D) leave disinfecting solution in the impression.

Question 6

A model consists of the _____ portion,which represents the teeth and tissues of the mouth,and the _____ portion,which forms the base of the cast.

Accepted Answer

A) art; anatomical 
B) anatomical; foundation 
C) anatomical; art 
D) oral cavity; foundation 
A) art; anatomical 
B) anatomical; foundation 
C) anatomical; art 
D) oral cavity; foundation

Question 7

A device that holds maxillary and mandibular models in an occlusal relationship is a(n):

Accepted Answer

A) face bow. 
B) occlusal register. 
C) bite block. 
D) articulator. 
A) face bow. 
B) occlusal register. 
C) bite block. 
D) articulator.

Question 8

Light-cured resin can be used to make trays for ________ impressions.

Accepted Answer

A) edentulous 
B) dentulous 
C) partially edentulous 
D) all types of impressions 
A) edentulous 
B) dentulous 
C) partially edentulous 
D) all types of impressions

Question 9

When constructing ________ with a vacuum former,you will use a heavier-gauge,flexible plastic that does not require a spacer but does require an attachment for the strap.

Accepted Answer

A) an impression tray 
B) provisional coverage 
C) a vital bleaching tray 
D) a mouth guard 
A) an impression tray 
B) provisional coverage 
C) a vital bleaching tray 
D) a mouth guard

Question 10

Which are methods used to protect against biohazard contamination from impressions?

Accepted Answer

A) Disinfecting impressions in the treatment room before bringing them to the laboratory 
B) Disinfecting laboratory benches and other contaminated items after use 
C) Disinfecting laboratory benches and other contaminated items before use 
D) All are methods that can reduce contamination from impressions. 
A) Disinfecting impressions in the treatment room before bringing them to the laboratory 
B) Disinfecting laboratory benches and other contaminated items after use 
C) Disinfecting laboratory benches and other contaminated items before use 
D) All are methods that can reduce contamination from impressions.

Question 11

A trimmed maxillary model will be _____ at the anterior portion,and the mandibular model will be _____ at the anterior portion.

Accepted Answer

A) pointed; rounded 
B) rounded; pointed 
C) rounded; rounded 
D) pointed; pointed 
A) pointed; rounded 
B) rounded; pointed 
C) rounded; rounded 
D) pointed; pointed

Question 12

When constructing custom trays it is best to remove excess material with a lab knife after it has cured.

Accepted Answer

A) True 
 B)False

Question 13

Which form of gypsum products is used for the creation of dies?

Accepted Answer

A) Plaster 
B) Model plaster 
C) Dental stone 
D) High-strength stone 
A) Plaster 
B) Model plaster 
C) Dental stone 
D) High-strength stone

Question 14

A self-cured resin tray should be used:

Accepted Answer

A) after the heat has diminished. 
B) while it is giving off heat. 
C) immediately after construction. 
D) after 24 hours. 
A) after the heat has diminished. 
B) while it is giving off heat. 
C) immediately after construction. 
D) after 24 hours.

Question 15

Before constructing a light-cured tray,paint the model with a(n):

Accepted Answer

A) adhesive. 
B) plaster. 
C) monomer. 
D) separator. 
A) adhesive. 
B) plaster. 
C) monomer. 
D) separator.

Question 16

The advantage of more equipment and expertise in the office dental laboratory is that:

Accepted Answer

A) overhead costs rise. 
B) the dentist or private laboratory technician can handle larger cases. 
C) more work will be completed by the commercial laboratory. 
D) there is less work to do for the private dental laboratory technician. 
A) overhead costs rise. 
B) the dentist or private laboratory technician can handle larger cases. 
C) more work will be completed by the commercial laboratory. 
D) there is less work to do for the private dental laboratory technician.

Exam 47: Laboratory Materials and Procedures

Which of the following statements correctly describes the pouring methods used to create the base portion of a dental model?

The dental wax that is used for recording occlusal rims and for denture wax-ups and that is supplied in sheets is called ________ wax.

When taking a face-bow registration,the vertical indicator rod should be aligned with the patient's:

The purpose of ________ is to prevent a custom impression tray from sitting too deeply when taking the impression.

When preparing impressions for pouring,it is important to:

A model consists of the _____ portion,which represents the teeth and tissues of the mouth,and the _____ portion,which forms the base of the cast.

A device that holds maxillary and mandibular models in an occlusal relationship is a(n):

Light-cured resin can be used to make trays for ________ impressions.

When constructing ________ with a vacuum former,you will use a heavier-gauge,flexible plastic that does not require a spacer but does require an attachment for the strap.

Which are methods used to protect against biohazard contamination from impressions?

A trimmed maxillary model will be _____ at the anterior portion,and the mandibular model will be _____ at the anterior portion.

When constructing custom trays it is best to remove excess material with a lab knife after it has cured.

Which form of gypsum products is used for the creation of dies?

A self-cured resin tray should be used:

Before constructing a light-cured tray,paint the model with a(n):

The advantage of more equipment and expertise in the office dental laboratory is that:

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

General Dentistry

Matrix Systems for Restorative 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

Business Operating Systems

Financial Management in the Dental Office

Marketing Your Skills

A model consists of the _ portion,which represents the teeth and tissues of the mouth,and the _ portion,which forms the base of the cast.

A trimmed maxillary model will be _ at the anterior portion,and the mandibular model will be _ at the anterior portion.