Common questions

What is intraoral film composed of?

What is intraoral film composed of?

Intraoral film consists of a plastic base covered on both sides with emulsion of silver halide crystals. The film is wrapped in black paper with a lead foil backing placed on the side that Page 4 will be farthest from the beam. The lead foil prevents scatter radiation from affecting the back side of the film.

What are the components of radiographic film?


  • base: cellulose triacetate or polyester.
  • substratum: an adhesive layer containing gelatin and solvents that bind emulsion and base.
  • emulsion: silver halide and gelatin, with some hardening agents.
  • protective layer: gelatin.

How many components are there in a dental film composition?

Composition. X-ray film has two principal components: (1) emulsion and (2) base. The emulsion, which is sensitive to x rays and visible light, records the radiographic image.

What is an intraoral film?

There are two main types of dental X-rays: intraoral (meaning the X-ray film is inside the mouth) and extraoral (meaning the X-ray film is outside the mouth). Intraoral X-rays are the most common type of dental X-ray taken. Extraoral X-rays show teeth, but their main focus is the jaw and skull.

Which film size is most commonly used?

35mm film is easily the most popular choice. It was first made available in 1934. Most people are familiar with this format, it comes as a cartridge that fits into all 35mm film cameras.

What are the two main parts of radiographic film?

The radiographic film is composed of a base and an emulsion layer joined together by the substratum. The emulsion may be coated on one side (single emulsion film) or both sides (double emulsion film).

What is the color of subbing layer?

In color films, each emulsion layer has a different color dye forming coupler: in the blue sensitive layer, the coupler forms a yellow dye; in the green sensitive layer the coupler forms a magenta dye, and in the red sensitive layer the coupler forms a cyan dye.

What is Alara principle?

The guiding principle of radiation safety is “ALARA”. ALARA stands for “as low as reasonably achievable”. This principle means that even if it is a small dose, if receiving that dose has no direct benefit, you should try to avoid it.

What are 3 types of intraoral radiographs?

There are three types of diagnostic radiographs taken in today’s dental offices — periapical (also known as intraoral or wall-mounted), panoramic, and cephalometric.

Can you say no to dental xrays?

Even if you have a patient sign a form stating he or she willingly refuses radiographs, no patient can give consent for the dentist to be negligent. A patient simply cannot waive their right to receive adequate care by signing a refusal for x-rays.

Why is it called 35mm film?

The 35 mm format, or simply 35 mm, is the common name for the 36×24 mm film format or image sensor format used in photography. The name 35 mm originates with the total width of the 135 film, the perforated cartridge film which was the primary medium of the format prior to the invention of the full frame DSLR.

What are the different types of films?

Feature films. [40 min or more]

  • Short films. [under 40 min]
  • Animated films.
  • Film adaptations.
  • Historical films.
  • Biographical films.
  • Silent films.
  • Documentary films.
  • When to expose periapical films with paralleling technique?

    Anterior Exposure Sequence • When exposing periapical films with the paralleling technique, always start with the anterior teeth (canines and incisors) because: • The number 1 size film used for anteriors is small, less uncomfortable, and easier for the patient to tolerate.

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    What is the speed of an intra oral radiograph?

    INTRAORAL FILM SPEED • Film speed refers to amount of radiation required to produce a radiograph of standard density • An alphabetical classification system is used to identify film speed • Speed ratings ranging from A speed [slowest] to F speed [fastest] • Only D speed and E speed film is used for intra oral radiograph.

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