(7) X-RAY FILM, INTENSIFYING SCREENS, AND GRIDS

EXTRAORAL X-RAY FILMS

Also known as screen film

INTRAORAL X-RAY FILMS

Made of double emlusion film

Outer plastic/vinyl/paper wrapping

Protects film from saliva

Black paper wrapping

Protects emulsion

Lead foil/sheet

Prevents backscattering of radiation, reduces patient exposure

PLASTIC WRAP (OUTER PLASTIC)

Moist resistant; To give correct orientation of your patient’s diagnostic radiograph

Pimple

Convex (film towards the focal spot)

Dimple

Concave (film towards the tongue of the patient)

Lead

With an embosed backing; show what is the back and front of the xray film. To minimize your patient’s exposure from backscatter radiation

Black paper wrapper

Light proof and protects our film from any visible light

Protective layer

Also called as the overcoat; protects film from any damages or scratches

Emulsion

Most complex composition; where the image is registered

Silver Hallide Crystals

Made up of silver bromide

Vehicle Matrix

Made up of gelatinous and non-gelatinous material, which our silver hallied grains are evenly dispersed

Silver Hallide Grains

For entrapping silver ions for forming the image

Insight films

Has a flat tubular crystals (1.8mm)

Ultra Speed Films

Globular shaped (1mm)

Iodide

Is placed to disrupt the regularity of our SHG to make them more sensitive to X radiation and visible light

Adhesive Layer

A thin layer of adhesive material is applied to the base before the emulsion is applied

Base

Made up of polyester polyethylene terepthalate which holds the emulsion; usually 0.18mm thick

Screen films

Not inserted in the mouth of the patient; it is a big film and used with intensifying screens. Used for Panoramic, Dkull, and Lateral Cephalometric Views

Intensifying Screen

Presence make it more sensitive (10-60 times more sensitive); also called as cassette

Phosphor Layer

Made up of phosphorescent crystals suspended in polymeric binder

Reflective Layer

The layer between the base and the phosphor; made of titanium dioxide