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Exam (elaborations)

Dental Radiology 2024 Exam Questions with Correct Answers

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Dental Radiology 2024 Exam Questions with Correct Answers Radiation injury sequence - Answer-1. Latent period 2. Period of injury 3. Recovery period 4. Cumulative effects Seen in person irradiated, changes not transmitted to future generations - Answer-Somatic Effects Not seen in person...

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  • August 19, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Dental Radiology
  • Dental Radiology
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Dental Radiology 2024 Exam
Questions with Correct Answers

Radiation injury sequence - Answer-1. Latent period
2. Period of injury
3. Recovery period
4. Cumulative effects

Seen in person irradiated, changes not transmitted to future generations - Answer-
Somatic Effects

Not seen in person irradiated but passed to future generations - Answer-Genetic effect

Radiation effects on cells determined by - Answer-1. Mitotic activity
2. Cell differentiation
3. Cell metabolism

Cells that divide frequently or undergo many divisions over time are more sensitive to
radiation - Answer-Mitotic activity

Cells that are immature or are not highly specialized are more sensitive to radiation. -
Answer-Cell differentiation

Cells that have higher metabolism are more sensitive to radiation - Answer-Cell
metabolism

Cells with high sensitivity to radiation - Answer-1. Reproductive tissue
2. Lymphoid system
3. Bone marrow
4. Intestines
5. Mucous membranes

Medium sensitivity - Answer-1. Fine vasculature
2. Growing cartilage, bone
3. Salivary glands
4. Lungs
5. Kidneys
6. Liver

Low sensitivity - Answer-1. Nerve tissue
2. Skeletal muscle
3. Heart

, 4. Optic lens
5. Mature bone

Used to define three quantities of radiation - Answer-Radiation measurement

Roentgen - Answer-Coulomb/kg

Rad - Answer-Gray (Gy)

Rem - Answer-Sievert (Sv)

Before exposure radiation protection - Answer-1. Filtration
2. Collimation
3. PID

Filters out weaker x-rays and allows the more penetrating x-rays to pass through by
absorbing long wave radiation - Answer-Aluminum Filtration

X-Ray machines at or below 70 kVp - Answer-1.5 mm aluminum filtration

Machine operating above 7kVP - Answer-Require minimum of 2.5mm aluminum
filtration

Shapes x-Ray beam into more restricted area and reduces scatter. Reduction in size of
beam of radiation - Answer-Collocation

Beam size at pt's face can be no larger than - Answer-2.75 inches

Rectangular collimation reduces skin's surface area by - Answer-50-60%

Less volume of tissue is irradiated if - Answer-Long cone is used (PID)

Long cone = - Answer-Less scatter

During exposure rad reduction - Answer-1. Thyroid collar
2. The lead apron
3. Fast film
4. Intensifying screen
5. Rectangular collimation

Protects radiosensitive tissues of thyroid gland - Answer-Thyroid collar

Protects reproductive and blood forming tissues - Answer-Lead apron

Lead apron absorbs how many % of scatter radiation that would have reached
reproductive tissues - Answer-90%

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