Dental materials #2
Dental Materials Knowledge Quiz
Test your knowledge on dental materials and practices with our comprehensive quiz! This quiz covers various aspects, including gypsum products, acrylic, denture teeth, and more. Perfect for students, professionals, and anyone interested in dental sciences.
- 26 multiple choice questions
- Assess your understanding of dental materials
- Engage with practical scenarios and facts
When should impressions be disinfected
At the dental lab check in
Before rinsing with water
Chairside upon removal and after rinsing under water
For an hour before pouring in gypsum
Which of the following gypsum products is ideal for making full or partial dentire models, orthodontic models, and casts requiring higher strength and abrasive resistance?
Impression plaster (Type I)
Model plaster (Type II)
Dental stone (Type III)
Dental stone, high strength (Type IV)
Which of the following statements is true concerning the mixing of plaster and stone materials?
The measured amount of powder is placed into the mixing bowl and the water is slowly sifted into the powder
The measured amount of powder is placed into the mixing bowl and the water is dumped into the powder
The measured amount of water is placed into the mixing bowl and the powder is slowly sifted into the water
The measured amount of water is placed into the mixing bowl and the powder is dumped into the water
What does it mean when freshly mixed gypsum loses it gloss?
Beginning of the working time
Final compressive strength
Initial set
Final set
Utility was may be used to 1. Adapt the periphery of an impression tray 2. Provide a better fit into the vestibule of the impression material 3. Cover sharp brackets and wires for orthodontic patients
1,2,3
1,2
2,3
1
Which of the following correctly represents the stages seen when acrylic powder and liquid are mixed together
Dough, sandy, rubber, and strungy
Stringy, sandy, dough, and rubber
Sandy, stringy, dough, and rubber
Rubber, stringy, dough, and sandy
Which of the following is true of plastic (acrylic) and porcelain denture teeth?
Porcelain teeth are used more often than plastic teeth
Porcelain denture teeth chemically bond to the acrylic base of the denture
Plastic denture teeth do not wear the opposing natural or artificial teeth or restorations
It is easier to grind porcelain denture teeth rather than acrylic denture teeth to adjust the occlusion or to reshape a tooth to fit the available space
A specialized aspect of a/an ___ practice may include the fabrication of maxillofacial prostheses to replace facial tissues lost as the result of trauma, disease, surgery, or birth defect
Prosthodontic
Periodontic
Endodontic
Orthodontic
Why must dentures be relined periodically?
Dentures absorb odors from plaque and food
Dimensional changes in acrylic occur
Alveolar ridges shrink over time
How long would it take a prepared tooth without occlusal/incisal and proximal contact to migrate laterally or occlusally/incisally?
Days
Weeks
Months
Years
Which of the following is true of preformed polycabonate provisional crowns
They are incompatible with acrylic resin
Like metal, they are flexible and may be crimped with contouring pilers
The primary advantage is their esthetics for replacement of anterior teeth
Unlike their metal partners, they do not come in several sizes and shapes
_______ generated during the polymerization of chemical-cured acrylic can potentially damage the pulp or burn soft tissues.
Heat
Off-gassing
Chemical by-products
Hydroquinone
Cement provisionals are most frequently fabricated with which material?
Zinc polycarboxylate
Zinc oxide eugenol
Calcium hydroxide
Zinc phosphate
Zinc oxyde provisionals should not be used if a permanent restoration is to be cemented with a _____ luting agent
Resin
Glass ionomer
Zinc phsphate
Zinc polycarboxylate
If a provisional crown comes off during a time that the dental office is closed, the patient can be instructed to replace it after cleaning the interior of the crown and placing a small amount of ____ into the crown
Cyanoacrylate (super glue)
Liquid nails cement
Denture adhesive
Chewing gum
What home care instructions would be given to a patient with a provisional restoration
Do not brush or floss the restoration
Brush but do not floss the restoration
Brush and floss the restoration as you would any other tooth
Brush and floss the restoration sliding the floss through the cervical embrasure
What is the most common use of stainless steel crown?
Crown prep on an adult molar
Crown prep on a primary molar
Crown prep on an anterior tooth
Bridge prep in the adult posterior teeth
Which of the following is true regarding sports guards
They usually cover the mandibular teeth, gingiva, and bone
They can absorb 100% of the energy from a traumatic hit to the mouth
They cannot prevent lacerations to the lips for athletes with orthodontic braces or brackets
They can cushion the maxillary and mandibular teeth when an athlete's jaw are forced together by a blow to the lower jaw
A sports guard thickness of about ___mm is desirable for heavy contact sports in which injuries are more likely
1
2
4
8
What is a risk factor for obstructive sleep apnea (OSA)
Obesity
Large neck
High blood pressure
All of the above
What is a common treatment for people with severe OSA
Weight loss
Use of a CPAP machine
Reduced alcohol intake
Use of nasal decongestants
What is the function of an appliance for treating OSA?
Lifts the soft palate
Repositions the mandible
Postures the tongue forward
All are correc
When would a space maintainer be used?
Hold space for a permanent tooth
Guide a permanent tooth into place
Prevent a primary tooth from being lost prematurely
Open more space in the dental arch for accurate eruption
Which type of tooth aligner would be used for minor tooth movement
Space maintainer
Acrylic bite guard
Thermoplastic guard worn at night
Removable appliances that direct forces on the teeth to move them into proper alignment
How much potentially traumatic energy can a custom-fit mouth guard absorb
50%
60%
70%
80%
One of the most important jobs of a dental hygienist is
Discussing weight with an overweight patient
Educating our patients on proper homecare
Judging patients on their lifestyle
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