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Related Experiment Videos

KVP meter errors induced by plastic wrap.

D Jefferies1, J W Morris, V P White

  • 1College of Technical Careers, Southern Illinois University, Carbondale.

Journal of Dental Hygiene : JDH
|February 1, 1991
PubMed
Summary
This summary is machine-generated.

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Plastic wrap static electricity can cause inaccurate kilovoltage peak (kVp) readings on dental X-ray machines. The wrap affects the meter, not the actual X-ray output, ensuring consistent dental radiography.

Area of Science:

  • Radiology
  • Dental Imaging
  • Medical Physics

Background:

  • Dental X-ray machines utilize kilovoltage peak (kVp) settings to control radiation output.
  • Barrier techniques, such as using plastic wrap, are common for infection control during dental radiography.
  • Static electricity on plastic wrap can interfere with the accuracy of kVp meters.

Purpose of the Study:

  • To investigate if plastic wrap-induced errors in kVp meter readings affect the actual X-ray output of dental machines.
  • To determine the impact of static charge from plastic wrap on the precision of kVp measurements.

Main Methods:

  • Dental X-ray machine output was measured in mR/mAs using a radiation output device.
  • kVp meter readings were recorded with and without plastic wrap covering the X-ray console.

Related Experiment Videos

  • Milliamperage and time were kept constant while varying kVp settings under both conditions.

    • Main Results:

    • Plastic wrap created static electricity, leading to erroneous kVp meter readings.
    • The actual X-ray output remained consistent regardless of the inaccurate kVp reading caused by the plastic wrap.
    • A kVp of 50 produced the same output whether the meter read 50 kVp or was erroneously influenced by wrap to read 40 or 60 kVp.

    Conclusions:

    • Plastic wrap influences the kVp meter's needle, not the dental X-ray machine's actual kilovoltage output.
    • Dental professionals should set kVp before applying plastic wrap to avoid exposure errors.
    • Adhering to this procedure minimizes retakes and reduces patient radiation exposure. Sodium hypochlorite disinfectant is an alternative if errors persist.