Practice Exam II

Dental Materials Practice Exam II

This exam is intended for you to practice the content from the Dental materials lectures 4 to 7 (Hygiene, Cosmetics and Cementation, Endodontic Materials, Oral Surgery and Implantology, and Modern and Miscellaneous Dental Materials)

The exam result is not recorded, and you can repeat the exam as many times as you like.

1 / 30

What is the use of a splint?

To straighten crooked teeth.

To prevent grinding of teeth at night.

To treat wooden "splinters" in the mouth.

To treat TMJ disorders.

2 / 30

Of what use is EDTA during root canal treatments?

As as replacement for MTA in apicectomies

As a sealer

As a root canal irrigant

As a prefrabricated post alternative to fiber posts

3 / 30

Give a reason why it may be advantageous to use Chlorhexidine.

It has no risk of increasing calculus formation long term.

It prevents the formation of stains, unlike Oxysafe.

It has no chance of negatively affecting the balance between healthy and bad bacteria.

It has both anti-bacterial and anti-fungal effect.

4 / 30

Rami has a surgical tooth extraction. The dentist closes the wound using catgut, a natural resorbable suture. Which of the following is true?

It breaks down over time by itself chemically, without the aid of the body's enzymes.

Catgut sutures break down with the aid of the body's enzymes over time.

Rami must return to have the sutures removed, 5 years after his review appointment.

Non-resorbable synthetic sutures are superior, because they break down in the body at a faster rate.

5 / 30

Which kind of cases is most appropriate for Transcend composites?

In an amalgam-style cavity without etching, bonding and light curing.

As a sealer.

Luting lithium disilicate to the tooth, with a strong chemical bond.

Fillings, to easily match the shade.

6 / 30

Identify the true statement concerning implants.

Titanium allergies are relatively common.

Titanium may bring a greyish colour to both restorations and gums.

Implant sizes are given in centimeters, with the diameter and the length of the implant on the box.

Zirconia oxide cannot be used to make implants.

7 / 30

A patient asks why they are experiencing a slight bitter taste after brushing with toothpaste. How do you answer them?

Sodium Lauryl Sulfate in toothpaste interferes with (can change) taste sensation for a short while.

The patient rinsed with water after brushing, instead of only spitting out the excess.

Fluorapatite is more bitter than hydroxyapatite.

Toothpaste contains microliter levels of lidocaine, which numbs your taste buds for a short while.

8 / 30

What is the true statement concerning an opaquer?

It makes opaque composite materials more translucent (see-through).

It can be used as a luting agent for PFM crowns.

It masks discolouration, but should be used with a strict bonding protocol.

It is an alkasite.

9 / 30

Which of the following is true about zinc polycarboxylate cements?

[Select two (2) correct answers]

The material can be used for luting, as a cavity base and for cementing orthodontic bands.

Zinc polycarboxylate is very weak like Calcium Hydroxide.

They are made from zinc oxide and polyacrylic acid.

It should be handed to the dentist after cobwebbing has occured, not while it is still glossy.

10 / 30

Which of the following is true about bleaching?[Select two (2) correct answers]

At-home whitening solutions typically use higher concentrations than in-office solutions.

Hydrogen peroxide chemically changes the structure of the full thickness of enamel and dentin of bleached teeth.

It is normal for patients to experience sensitivity after bleaching for up to 48 hours.

Carbamide or hydrogen peroxide are the active ingredients.

11 / 30

Why are epoxy resin sealers favored over all others?

They have the best sealing ability.

They form the best bond with custom casted posts.

They increase the strength of the gutta percha cones.

They are the cheapest.

12 / 30

Which sealers form a monoblock in the root canal space, by adhering both to the dentinal walls and the gutta percha?

Calcium hydroxide sealer.

Resin-based sealer.

Epoxy resin sealer.

Polyketone sealer.

13 / 30

Dr. Adam is performing an oral surgical procedure, and a lot of bleeding occurs. Applying pressure is not working. What can you bring to help him?

Bring gelatin foam, as a hemostatic agent.

Bring Zinc oxide eugenol to help stop the bleeding.

Bring ferric fluoride to help stop the bleeding.

Bring a pure, unsoaked thread of retraction cord to tie the bleeding artery.

14 / 30

Which of these materials cannot be used as a post in an endodontically treated (root canaled) tooth?

Fibre post

Custom Metal post

Prefabricated Metal post

Cention N

15 / 30

Which of the following is true about zinc phosphate cements?

[Select three (3) correct answers]

The material is acidic, meaning most of these cements can cause sensitivity.

They contain zinc oxide and phosphoric acid.

They form a chemical bond between e.max and tooth structure.

They are strong.

16 / 30

What is the most commonly used anesthetic in dentistry?

Cocaine.

Bupivacaine.

Lidocaine.

Articaine.

17 / 30

Dr. Agnes is placing an implant, and decides that a bone graft with a biofriendly resorbable membrane is necessary. Which material would be the best choice for the membrane?

Titanium mesh

Zirconia

Collagen

PTFE

18 / 30

Which of the following types of bone graft is the commonly used calcium-phosphate materials?

Synthetic graft

Xenograft

Autograft

Allograft

19 / 30

Which of the following is true about toothbrushes? [Select two (2) correct answers]

People without access to modern toothbrushes have no natural things to use.

Basic natural toothbrushes made from Miswak have been used for centuries.

Manual toothbrushes clean better than electric toothbrushes.

If nylon bristles are too hard, the patient can use softer materials like boar hair.

20 / 30

Which of the following is true about dental floss?

The use of nylon dental floss increases the risk of plaque building up.

Both waxed and unwaxed versions of floss exist.

Patients do not like certain types of floss more than others.

Only PTFE floss is effective at removing plaque.

21 / 30

How does hydroxyapatite help reduce sensitivity in Mira-sensitive toothpaste?

It helps plug (cover) exposed dentinal tubules.

It softens overly hardened fluorapatite.

It calms the nerves of the pulp chamber.

It is a strong antibacterial agent, killing the bacteria that cause cavities and thus, sensitivity.

22 / 30

Professional Oxysafe gel targets anaerobic bacteria that cause peri-implantitis and periodontitis. It does this with its hydrocarbon oxoborate formula. Which element does this release?

Hydrogen

Oxygen

Boron, which is a potent antibacterial compound.

Carbon

23 / 30

Which of the following is true about sodium hypochlorite?

[Select three (3) correct answers]

Sodium hypochlorite is used in cold sterilisation.

Sodium hypochlorite dissolves organic matter.

Sodium hypochlorite is safe to handle with bare hands.

Sodium hypochlorite is a very strong disinfectant.

24 / 30

Select two (2) true statements about MTA.

It is a popular tissue adhesive.

MTA in full is Mineral Trioxide Aggregate.

MTA is the gold standard for repairing perforations.

MTA has excellent biological properties, but it is too weak to be used for apicectomies.

25 / 30

What is the use of articulating paper?

To remove hardened calculus.

To polish teeth.

To remove cross-articulating anerobic bacteria.

To show contact points of occlusion with dye.

26 / 30

What is the advantage of bulk fill composite over normal composite?

It has increased opacity, to ensure better shade matches with teeth.

It contains an alkasite filler that releases fluoride.

It has a curing depth of 4 mm.

It has increased translucency, for better esthetics (beauty).

27 / 30

What is the purpose of the silicon carbide particles in Opalustre, a compound used for enamel micro-abrasion?

To chemically dissolve surface-level stains.

To mechanically erode (scrub) stains in the outermost enamel.

To mechanically erode (scrub) stains in the outermost dentin.

To assist the formation of fluorapatite to harden teeth.

28 / 30

Which of the following is true about fluoride? [Select two (2) correct answers]

Fluoridated toothpaste is not safe for children under 12 years of age, due to increased risk of overdose.

Different regions in Uganda can have different levels of fluoride in the local water sources.

Professional fluoride varnish contains about twice the amount of fluoride as regular toothpaste.

Tooth decay depends not just on fluoride, but also on diet, hygiene, habits among other factors.

29 / 30

Which is the best set of gloves to use for an implant placement surgery (a big oral surgical procedure)?

Sterile gloves.

Polyvinyl examination gloves.

Latex-free powdered examination gloves.

Latex non-powdered examination gloves.

30 / 30

Which dental condition is caused by high levels of fluoride in the drinking water supply, when the child is less than 8 years old?

Fluorosis.

No significant effect on teeth.

Juvenile (children's) dental fluoritis.

Fluoride overdose.

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