X _ray films. Extraoral films. Intraoral films. Occlusal. Periapical. Cephalometric. Panoramic. Bite wing. Bitewing Film. This film shows the crowns of both maxillary and mandibular teeth on one film . The bitewing film is used to identify interproximal caries. Occlusal Film.
The occlusal film is used to identify the extent of larger pathological conditions, to locate an object in the buccolingual direction
Impacted maxillary canine
Anterior dentition - Child
Extraoral films used in Dentistry include the Panoramic, Lateral oblique jaw film, Cepahalometric film.
The panoramic film is the most common extraoral film used in dentistry. It does not provide the detail that intraoral films do but it gives an overall view of the entire dentition, both maxillary and mandibular. It is very helpful for third molar extractions
Surgery patient- mandibular implant
Cephalometric films, such as the lateral cephs above, are used to identify both the bone and the soft tissue outline on the same film. This film is used routinely by orthodontists in developing treatment plans for their patients. It is also used by oral surgeons for evaluating trauma and conditions requiring surgical correction.
Black paper: surrounds film;
raised dot in one corner used for film orientation.
Lead foil: protects film from backscatter ; reduces patient exposure
SO IT prevent:
— Some of the residual radiation that has passed through the film from continuing on into the patient's tissues
— Scattered secondary radiation, from X-ray photon interactions within the tissues beyond the film ,coming back on to the film and degrading the image
Scatter (secondary)radiation is produced when the primary x-rays from the x-ray tube interact with the patient’shard and soft tissues. Backscatter radiation refers to those scattered x-rays that go “back” toward the film.
Scatter (secondary) x-rays
The contents of a film packet.
A The outer wrapper.
B The film.
C The sheet of lead foil.
D The protective black paper
An x-ray film is composed of a plastic (polyester) base covered on both sides with an emulsion; this is called a double-emulsion film. The emulsion contains silver halide crystals which are surrounded by gelatin. The silver halide crystals are affected by the x-rays and eventually form the image during film processing.,
The emulsion (gray lines below) is attached to the base with a very thin layer of adhesive (green lines below). The base has a slight bluish tint which makes viewing the films easier on the eye. The emulsion is covered with a thin layer of gelatin, a “supercoat,” which helps to protect the film (yellow lines below).
(emusion on both sides)
emulsion with silver halide crystals and gelatin
Diagram showing the cross-sectional structure of
double emulsion radiographic film
Adult PA, BW
Adult ant. PA
Occlusal in adults
Child PA, BW
The white side of the film packet faces the tube. A, Size 4 occlusal film.
B, Size 2 film;C size 1 film.
Flexible vinyl cassette
The film speed determines how much exposure time is required to produce the image on the film.
# of films