Pan Dental Infection Control and Radiation Course

Pan Dental Infection Control and Radiation Course Exam 2026

This exam is designed to test your knowledge in infection control and radiation. It consists of 50 questions: 25 from infection control and 25 from radiation. The time limit is 90 minutes, and the pass mark is 60%. Good luck!

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1 / 50

Which of the following protocols should we follow concerning the clean and contaminated zones?

We should return clean, unused instruments from the contaminated zone back to the clean zone.

We must disinfect all surfaces in the contaminated zone between patients.

2 / 50

On an intraoral X-ray machine, we have a control panel, the extension arm and ________?

X-ray tubehead.

Secondary control panel.

Secondary extension arm.

3 / 50

Where do the upper back teeth roots point towards?

Towards the palate.

Towards the cheek.

4 / 50

In Droplet transmission, particles travel short distances before reaching the ground, whereas in airborne transmission, particles can travel very long distances. True or False?

False

True

5 / 50

Engineering controls are devices that are intentionally designed in the factory to minimise the risk of spreading infection in the dental office. True or False?

False

True

6 / 50

Which of the following is true about X-rays?

Cysts are usually radiolucent.

Cancer is always radiopaque.

It is always possible to tell apart infection, cancers, cysts and tumors on just an X-ray.

7 / 50

The periodontal ligament space is radiopaque. True or False.

True

False

8 / 50

Which of the following can be seen on an X-ray?

Gum tissue.

Gum colour.

Bone level.

9 / 50

Which of the following pathogens causes kissing disease or Infectious Mononucleosis?

Mycobacterium tuberculosis

Streptococcus mutans

Streptococcus pneumoniae

Porphyromonas gingivalis

Epstein-Barr virus

10 / 50

Which of the following is true about infection control of impressions?

Impressions do not need infection control.

One can rinse them with water, soak them in 0.5 to 1 per cent sodium hypochlorite solution for 10 minutes and then rinse them.

Alginate impressions should be soaked in disinfectant for 3 days.

11 / 50

Hand hygiene removes all of the _______ (1) flora, and reduces on the number of the ________ (2) flora.

1. Transient 2. Resident

1. Resident 2. Transient

12 / 50

What does an autoclave use for sterilisation?

Steam.

Steam under pressure.

Plasma.

Gas.

13 / 50

Which of the following is true about infection control of radiation?

Digital sensors are heat sterilisable.

Barrier protection can be used for both digital and analogue X-rays.

Films should be transported to the darkroom in clothes' pockets.

The X-ray machine should be cleaned always with a high-level disinfectant to achieve cold sterilisation.

14 / 50

A radiolucent area of the tooth on the root surface above the bone level, but below the crown is usually __________.

Cervical burnout.

Root cavities.

15 / 50

Modern digital sensors convert X-rays into light, a process known as_______.

Dehydration.

Sterilisation.

Collimation.

Scintillation.

16 / 50

Moving away from the radiation source significantly reduces the dose received because of the inverse square law. Distance is one of the best ways to protect ourselves from radiation. True or false?

True

False

17 / 50

Select the true statement concerning gowns.

They do not need to be changed when soiled.

They should be worn for every procedure requiring a high-speed handpiece.

Dental assistants should take them home and wash them with strong detergents.

Only disposable gowns are available.

18 / 50

___________ (1) immunity is got when a person meets the real bacteria while __________ (2) immunity is got when the person meets antibodies against the bacteria.

1. Artificial 2. Natural

1. Passive 2. Active

1. Active 2. Passive

1. Natural 2. Artificial

19 / 50

___________ reduces the size of the radiation field to 6 cm.

Ionisation.

Collimation.

Filtration.

20 / 50

Where do the lower back teeth roots point towards?

Towards the tongue.

Towards the cheek.

21 / 50

Where is the X-ray detector for intraoral X-rays?

Inside the mouth.

Outside the mouth.

22 / 50

The dentin is more radiopaque than the enamel of the tooth. True or False.

True

False

23 / 50

To see superimposed structures (ones that are in front or behind one another), after taking an orthograde X-ray, we can take a ___________.

Another orthograde X-ray.

Eccentric X-ray.

24 / 50

X-rays that have a longer wavelength have higher amounts of energy than those with shorter wavelengths. True or False?

True

False

25 / 50

Which of the following is NOT an example of bloodborne transmission?

Mother-to-child during birth.

Aerosol.

Needlestick injuries.

26 / 50

The size of teeth (which are 3D objects) can be accurately shown on a 2D X-ray without distortion. True or False?

False

True

27 / 50

_____________ infections like unusual brain and lung infections, and even oral candidiasis, occur when the immune system has been weakened by long-term HIV infection.

Nosocomial.

Opportunistic.

28 / 50

Masks filter all aerosol particles: none can pass through them. True or False?

False

True

29 / 50

How can we wipe used blood-stained dental instruments in the treatment room?

Pick the instrument up and wipe it with gauze.

Use one hand to wipe the instrument on the table.

Use two hands and wipe them on the table.

30 / 50

Which of the following is true about viruses?

They are large enough to see with a light microscope.

They may survive on surfaces for a short time in the right conditions.

They can be treated with antibiotics.

They divide mainly outside host cells.

31 / 50

Which of the following is true about cavities?

Cavities are always seen, even on overlap.

They are radiopaque.

Cavities are seen when a large portion of the area has been demineralised.

All cavities are visible on the X-ray.

32 / 50

Autoclave cycles consist of a heat-up period, exposure period and cooldown period. When is it? allowed to take instruments out of the autoclave

During the heat-up period.

During the exposure period.

After the cooldown period.

During the cooldown period.

33 / 50

The __________ is legally responsible for radiation safety, and creation of a radiation safety manual in a dental office.

Medical director, senior dentist or radiation safety officer.

The dental assistant.

The sterilisation officer.

34 / 50

Which of the following is true about instrument processing?

Critical instruments should always be sterilised using priority/flash sterilisation.

Presoaking, cleaning and wiping all help to remove bioburden on the surface of instruments.

Ultrasonic instrument cleaners and instrument washers can replace autoclave sterilisation.

Semi-critical instruments MUST arrive to the treatment room sterile in sterile packages.

35 / 50

The process of a wave moving up and down or side to side as it travels is known as ________?

Sterilisation.

Oscillation.

Ionisation.

Defibrillation.

36 / 50

You can only get Hepatitis D if you have been previously infected with Hepatitis B or get Hepatitis B at the same time. True or False?

False

True

37 / 50

Which of the following is FALSE about hepatitis viruses?

They can cause long-term asymptomatic infection, known as the carrier state.

Apart from jaundice, hepatitis viruses can also cause abdominal pain, fever and joint pain.

They multiply inside liver cells and cause liver inflammation.

All patients infected with these viruses develop jaundice.

38 / 50

For OPGs (panoramic X-rays), the sharpest area of the image is called the ____________.

Sharp zone of definite resolution.

Pano zone.

Focal trough.

39 / 50

A patient is worried that dental X-rays will cause them to develop mouth cancer. They heard this from a video on the internet. Is this true?

No, they will not. It is true that every dental X-ray exposure increases the risk of cancer, but by a very small (almost zero) amount.

Yes, they will develop cancer.

40 / 50

Which of the following is true about instrument processing?

The room should be dark and very close to the contaminated zone of the dental chair.

Ideally, it should have its own room, with separate sinks for hand washing and instrument cleaning.

Instruments should move from the contaminated zone back to the clean zone if they are not used.

41 / 50

The mouth can be both a portal of entry and a portal of exit. True or False?

False

True

42 / 50

Some countries say that packages of critical instruments remain sterile when stored in a cool-dry place like in a drawer, unless something bad happens to them (e.g. dust or becoming wet). This is known as:

National packaging regulations.

Long-term packaging.

Event-related packaging.

43 / 50

The vertical part of the mandible, between the body and the condyle, is called the ramus. True or False?

True

False

44 / 50

What makes hand hygiene different for larger oral surgical procedures?

In these surgeries, they only use high-level antiseptic solutions; they never use soap and water.

The arms are washed up to the elbows.

The arms become completely sterile.

Larger procedures have no prewashing.

45 / 50

During X-ray generation, braking radiation and characteristic X-rays are produced. Braking X-rays have different energies, while characteristic X-rays have the same energy. Why is this important?

The question is wrong. Braking X-rays have the same energy, while characteristic X-rays have different energy.

Braking X-rays will produce some low energy X-rays, which must be blocked using aluminium filters to reduce the patient dose.

It is not important.

46 / 50

A periapical X-ray is equivalent to about 1.5 days of radiation received from the sun, space and other natural sources. This is known as ______________.

Natural to medical radiation ratio.

Background Equivalent Radiation Time.

Time of Sun dose.

47 / 50

The cementum layer covering the root surface is visible on an X-ray. True or False.

False

True

48 / 50

Long-term liver inflammation from hepatitis viruses B and C can lead to liver cirrhosis and even liver cancer. True or False?

True

False

49 / 50

Dental assistants are not required to wear pocket dosimeters because the dose received from taking dental X-rays is very low. True or false?

True

False

50 / 50

________________ infections are caused by bacteria that are not normally dangerous, but attack when the immune system is weak.

Opportunistic.

Exogenous.

Nosocomial.

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