DANB RHS Practice Test

DANB RHS Practice Test Questions with Correct Answers

The size and shape of the primary beam is controlled primarily on the?a)length of PID b)collimator c)thickness of filter d)size of focal spot - Answer-b) collimator

The dentist suspects that the patient has significant bone loss. The best film for reading his or her bone level is?

• parallel technique periapical

b)horizontal bitewing c)panoramic film d)vertical bitewing - Answer-D) Vertical bitewing

Which of the following is the most radiosensitive?

• lens of eye
• fetus
• thyroid
• hand - Answer-b) fetus

Excessive vertical angulation will produce an image that is..

• forshortened
• magnified
• elongated
• high in density - Answer-a) Forshorthened

Which of the following is the best protection for the operator during exposing radiographs?

• remain 6ft and 90 degrees- 135 degrees with x-ray beam

b)block or concrete wall c)remain 8ft and 120 degrees from x-ray beam

• use fasted speed film available - Answer-b) block or conrete wall

The most likely cause of blurring on the radiographic image is?a)tubehead movement during exposure 1 / 3

b)use of an excessively long PID c)use of bisecting technique d)patient movement during exposure - Answer-d) Patient movement during exposure

One characteristic of a mandibular molar is?

a) Trifurcated roots

• small crowns
• bifurcated roots
• apex or roots tip mesially - Answer-C) Bifurcated roots

The ALARA concept relies on the operator techniques to?a)reduce the processing time b)save the patient money c)diagnose the radiographs d)reduce the x-ray exposure - Answer-D) Reduce the x-ray exposure

Inverted Y formation is best viewed on the ?

a) Mandibular caninie

b) Mandibular premolars

c) Maxillary premolar

d) Maxillary canine - Answer-d) Maxillary canine

The annual maximum accumulated dose (MAD) of radiation for dental assistant is based on which of the following calculations a)Age plus 18x3rems/year b)Age plus 18x5/rems a year c)Age minus 18x3rems/year d)Age minus 18x5rems/year - Answer-d)Age minus 18 x 5 rems/year

Long term-effects of exposure to radiation may be associated with?

• hair loss

b)nausea and vomitting c)hemorrahaging d)birth abnormalities - Answer-a) hair loss

When changing the 8-inch PID to a 16-inch PID, which of the following is used to determined the intensity of the beam?a)onject-image receptor distance b)Inverse square law c)Slob rule d)Rule of isometry - Answer-b) Inverse square law

Compared to the paralleling technique a disadvantage of the bisecting angle technique is?a)the exposure time is longer b)the image receptor is more difficult to place 2 / 3

c)image distortion d)increased radiation absorption - Answer-c)Image Distortion

Blurred radiographic images are often caused by?a)failure to remove dental appliances b)patient movement during exposure c)improper positioning of the x-ray tube head d)overlapping bitewing - Answer-B) Patient movement during exposure

A operator can best protect themselves from radiation exposure by standing behind?

• drywall barrier

b)tubehead

• patients chair
• glass window - Answer-A) A drywall barrier

Additional filtration in the x-ray tube head protects..?

• dentist
• environment
• operator
• patient - Answer-d) patient

Processed PSP plates should be handled by the edges to prevent?

• contamination
• cone cuts
• scratches
• discoloration - Answer-C) Scratches

When exposing, what is the minimum instance the operator must stand away from the tube head?

• 2ft
• 4ft
• 8ft
• 6ft - Answer-d) 6ft

A radiograph will automatically be retaken when there is?

• cone cut
• bent plate
• double exposure
• scratched plate - Answer-c) double exposed

Which of the following causes the interproximal areas of the teeth to appear overlapped?a)Improper vertical angulation b)Patient talking during exposure c)Improper horizontal angulation d)Patient with shallow palate - Answer-c)Improper horizontal angulation

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