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Types of Dental Films

Periapical

Intraoral Dental Films Continued

  • shows entire tooth from the incisal or occlusal edge to 2-3mm beyond the apex

  • used to diagnose pathologic conditions of the tooth, root and bone, tooth formation and eruption

  • used especially in endodontics and oral surgical procedures
  • silver halide crystals absorb radiation during x-ray exposure and store energy emitted from the radiation which is known as latent image

Bitewing

FUN FACTS?

Intraoral Dental Films

  • switching from E to F speed film is 20-25% decrease in exposure to patients

  • switching from D to F speed film is 60% decrease in exposure to patients
  • shows crowns of both arches and part of the roots

  • used to detect

-decay interproximally,

-recurring decay under restorations

-periodontal disease

- check the fit of crowns or metallic fillings

  • consist of semi flexible acetate film base that's coated on both sides with emulsion of silver bromide, silver halide, and silver iodide
  • thickness of emulsion and presence of special radiosensitive dyes determine film speed

Occlusal

  • shows large areas of the maxillary or mandibular arches
  • used to locate retained roots of extracted teeth and supernumerary unerupted or impacted tooth
  • locate salivary stones and fractures of maxilla or mandible
  • examines cleft palates and measures changes in size or shape of maxilla and mindible

Extraoral Dental Films

Otto Walkhoff discovered the first intraoral dental radiograph in 1895

Jamie Wyman

DAC113

  • designed for use in cassettes

  • examine large areas of the head and jaws.

  • screen film and non screen film

Chephalometric

  • shows bony and soft tissues of facial profile

What are intensifying screens?

References

  • intensifies the effect of radiation which decreases exposure time

  • coated with phosphor that gives off light when struck by x-radiation

  • speed of the screen depends on the type of phosphor and the size of the crystals.

Chen, C., Lin, S., Chiu, H., Lin, Y., Chen, Y., & Lin, L. (2007). An aiming device for an extraoral radiographic technique. Journal Of Endodontics, 33(6), 758-760.

Panoramic

Screen film

Sommers, T., Mauriello, S., Ludlow, J., Platin, E., & Tyndall, D. (2002). Pre-clinical performance comparing intraoral film and CCD-based systems. Journal Of Dental Hygiene, 76(1), 26-33.

  • shows the wide view of upper and lower jaws on a single radiograph

  • used to locate impacted teeth, detect lesions in the jaw and observe eruption patterns
  • more sensitive to light emitted by the phosphor in intensifying screen than it is to radiation

  • Green-sensitive is used with cassettes with rare earth intensifying screens

  • Blue-sensitive film is used with cassettes with calcium tungstate intensifying screens

Nonscreen film

  • does not require intensifying screens

  • the emulsion is sensitive to direct x-ray

  • requires more exposure time

  • not recommended for use
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