Dental Radiography Equipment, Imaging & Radiation Protection

What are the two basic types of dental radiography?

Extraoral and Intraoral

What is the purpose of collimation in dental radiography?

To limit the size of the x-ray beam and minimize extra-focal radiation.

What is the minimum focus to skin distance recommended for external cones?

At least 20 cm.

What does the term 'cephalometry' refer to?

The measurement of the head, often used in orthodontics.

What is an Orthopantomogram (OPT)?

A panoramic dental x-ray that captures the entire mouth in a single image.

What type of imaging technology uses photo-stimulable detectors?

Computed Radiography (CR) technology.

What is the role of the Legal Person in dental radiography?

To have corporate responsibility for radiation equipment and safety implementation.

What is the purpose of risk assessment in dental radiography?

To evaluate dose limits and ensure justification for imaging procedures.

What does ALARP stand for in the context of radiation doses?

As Low As Reasonably Practicable.

What is the recommended kV range for new dental x-ray equipment?

60 to 70 kV.

What should be done if doses exceed the intended amount in dental radiography?

Investigate the cause and report to the appropriate authority.

What is the importance of beam aiming and limitation?

To ensure the x-ray beam does not exceed the film size and maintains a minimum focus distance.

What is the recommended total filtration for tubes working over 70 kVp?

At least 2.5 mm Al equivalent.

What protective device is recommended for patients when the thyroid is in the primary beam?

A thyroid shield.

What is the significance of using rectangular collimation?

It helps to minimize patient exposure by limiting the x-ray beam to the area of interest.

What is the purpose of immobilization devices in dental radiography?

To ensure repeatable and consistent positioning of the patient.

What is the role of the operator in dental radiography?

To perform the imaging procedures while ensuring safety and compliance with regulations.

What is the function of the control unit in dental radiographic equipment?

To manage exposure settings such as kV, mA, and time.

What is the importance of training in dental radiography?

To ensure that staff are knowledgeable about equipment use and safety protocols.

What does 'justification' mean in the context of dental imaging?

The net benefit of the imaging must be explicit and documented.

What is the recommended action if a controlled area workload exceeds specified limits?

Protective barriers should be implemented.

What is the purpose of quality assurance (QA) in dental radiography?

To maintain high standards of imaging quality and safety.