Question 1

What device that holds maxillary and mandibular models in an occlusal relationship?

Accepted Answer

A) Face bow 
B) Occlusal register 
C) Bite block 
D) Articulator 
A) Face bow 
B) Occlusal register 
C) Bite block 
D) Articulator D

Question 2

How should the patient bite when positioning the bite-fork during a face-bow registration?

Accepted Answer

A) Quickly 
B) Firmly 
C) Slowly 
D) Slide 
A) Quickly 
B) Firmly 
C) Slowly 
D) Slide C

Question 3

When would a light gauge,vacuum-formed resin material be used?

Accepted Answer

A) Bleaching trays 
B) Provisional coverage 
C) Impression tray 
D) Both a and b 
A) Bleaching trays 
B) Provisional coverage 
C) Impression tray 
D) Both a and b D

Question 4

Which type of resin is formed into a diagnostic model using heat and a vacuum former?

Accepted Answer

A) Self-cured 
B) Light-cured 
C) Thermoplastic 
D) Auto-cured 
A) Self-cured 
B) Light-cured 
C) Thermoplastic 
D) Auto-cured

Question 5

How should a plaster mix not be manipulated?

Accepted Answer

A) Complete mix within 2 minutes. 
B) Press bowl lightly on the vibrator. 
C) Complete mix in 30 seconds. 
D) Mix slowly until smooth. 
A) Complete mix within 2 minutes. 
B) Press bowl lightly on the vibrator. 
C) Complete mix in 30 seconds. 
D) Mix slowly until smooth.

Question 6

Which statement regarding infection control in the dental laboratory is accurate?

Accepted Answer

A) It is equally as important as when you are with a patient. 
B) It is not as critical as when you are with a patient. 
C) It is not a consideration because impressions are disinfected at chairside. 
D) It depends on the patient's medical history. 
A) It is equally as important as when you are with a patient. 
B) It is not as critical as when you are with a patient. 
C) It is not a consideration because impressions are disinfected at chairside. 
D) It depends on the patient's medical history.

Question 7

Water should be running through a model trimmer:

Accepted Answer

A) when turned off. 
B) when trimming. 
C) after trimming. 
D) before trimming. 
A) when turned off. 
B) when trimming. 
C) after trimming. 
D) before trimming.

Question 8

Which type of dental wax is used to construct occlusal rims and set denture teeth in the wax-up?

Accepted Answer

A) Bite registration 
B) Baseplate 
C) Utility 
D) Boxing 
A) Bite registration 
B) Baseplate 
C) Utility 
D) Boxing

Question 9

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 10

Which of the following gypsum products has the highest powder-to-water ratio?

Accepted Answer

A) Model plaster 
B) Dental stone 
C) High-strength stone 
D) All gypsum products have the same powder-to-water ratio. 
A) Model plaster 
B) Dental stone 
C) High-strength stone 
D) All gypsum products have the same powder-to-water ratio.

Question 11

How will gypsum material be affected if additional powder is added after mixing has begun?

Accepted Answer

A) Stronger 
B) Weaker 
C) Unaffected 
D) None of the above 
A) Stronger 
B) Weaker 
C) Unaffected 
D) None of the above

Question 12

After fabrication,when can a self-cured resin custom tray be used?

Accepted Answer

A) After the heat has dissipated 
B) While it is giving off heat 
C) Immediately after construction 
D) After 24 hours 
A) After the heat has dissipated 
B) While it is giving off heat 
C) Immediately after construction 
D) After 24 hours

Question 13

When constructing ______ with a vacuum former,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 14

What causes air bubbles in a model?

Accepted Answer

A) Using a vibrator 
B) Adding stone in small increments 
C) Impression material that is too thick 
D) Improper pouring of the impression 
A) Using a vibrator 
B) Adding stone in small increments 
C) Impression material that is too thick 
D) Improper pouring of the impression

Question 15

How should light-cured resin tray material be cured?

Accepted Answer

A) For 10 minutes 
B) Off the model 
C) For 2 minutes 
D) Without the spacer 
A) For 10 minutes 
B) Off the model 
C) For 2 minutes 
D) Without the spacer

Question 16

In minutes,how long should one wait before removing a model from an impression after pouring?

Accepted Answer

A) 10 to 15 
B) 15 to 30 
C) 30 to 45 
D) 45 to 60 
A) 10 to 15 
B) 15 to 30 
C) 30 to 45 
D) 45 to 60

Question 17

Before constructing a light-cured tray,what would be painted on the model?

Accepted Answer

A) Adhesive 
B) Plaster 
C) Monomer 
D) Separation medium 
A) Adhesive 
B) Plaster 
C) Monomer 
D) Separation medium

Question 18

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 19

A custom impression tray should fit and adapt well to the model and should maintain ____ mm of impression material between itself and the teeth.

Accepted Answer

A) 1 to 2 
B) 2 to 3 
C) 3 to 4 
D) 5 to 6 
A) 1 to 2 
B) 2 to 3 
C) 3 to 4 
D) 5 to 6

Question 20

Which technique listed would be incorrect when pour an impression?

Accepted Answer

A) In small increments 
B) In large amounts 
C) In the same place 
D) In a continuous flow 
A) In small increments 
B) In large amounts 
C) In the same place 
D) In a continuous flow

Exam 47: Laboratory Materials and Procedures

What device that holds maxillary and mandibular models in an occlusal relationship?

How should the patient bite when positioning the bite-fork during a face-bow registration?

When would a light gauge,vacuum-formed resin material be used?

Which type of resin is formed into a diagnostic model using heat and a vacuum former?

How should a plaster mix not be manipulated?

Which statement regarding infection control in the dental laboratory is accurate?

Water should be running through a model trimmer:

Which type of dental wax is used to construct occlusal rims and set denture teeth in the wax-up?

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

Which of the following gypsum products has the highest powder-to-water ratio?

How will gypsum material be affected if additional powder is added after mixing has begun?

After fabrication,when can a self-cured resin custom tray be used?

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

What causes air bubbles in a model?

How should light-cured resin tray material be cured?

In minutes,how long should one wait before removing a model from an impression after pouring?

Before constructing a light-cured tray,what would be painted on the model?

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

A custom impression tray should fit and adapt well to the model and should maintain ____ mm of impression material between itself and the teeth.

Which technique listed would be incorrect when pour an impression?

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