1. Discoid lupus erythematosus has all of the following characteristics except one. Which one is the exception?Predominately affects middle-aged womenProduces oral lesions that resemble erosive lichen planusInvolves damage to the heart and kidneyAffects the skin of the face and scalpQuestion 1 of 20 2. the purpose of a step down transformer in an x ray apparatus is tocontrol potential between cathode and anodecontrol voltage to the tube filamentreduce unnecessary radiationreduce danger of "pitting " the focal spot on the anodeQuestion 2 of 20 3. The purpose and use of the panaromic image include all of the following except one. Which one is the exceptionTo examine extent of large lesionsTo evaluate and diagnose cariesTo evaluate traumaTo evaluate impacted teethQuestion 3 of 20 4. On a radiograph the facial root of a maxillary first premolar would appear distal to the lingual root if theVertical angle of the cone were increasesVertical nagle of the cone were decreasedX ray head were angled from a diatal portion relative to the premolarX ray head were angled from a mesial position relative to the premolarQuestion 4 of 20 5. the technique employed in radiotherapy to counteract the effect of tumor motion due to breathing is known asarc technique modulationgatingshuntingQuestion 5 of 20 6. reversal lines are characteristic on the radiograph ofosteomaepidermoid cystosteosarcomapaget's disease of boneQuestion 6 of 20 7. Radiotherapy is not used inPaget diseaseMucoepidermoid carcinomaSpindle cell carcinomaSquamous cell carcinomaQuestion 7 of 20 8. a patient with a history of radiation therapy requires special consideration becausethe vascularity of bone may be disruptedsalivary function may be increasedthe potential for periodontal disease is greatly increasedpla accumulation greater than normal can be expectedQuestion 8 of 20 9. Clearing agent in fixer isSodium sulphateAmmonium thiosulphateAcetic acidPotassium bromideQuestion 9 of 20 10. An anatomic structure which has a worm hole radiolucency is characteristic ofNutrient canalMaxillary sinusMental foramenMandibular canalQuestion 10 of 20 11. After radiation therapy , child develop rampant caries,this is calledSecondary cariesRadiation cariesEarly childhood cariesRampant cariesQuestion 11 of 20 12. If an exposed radiograph is too dark after proper development, you should ____.Decrease development timeDecrease exposure timePlace it back in the fixerPlace it back in the developerQuestion 12 of 20 13. In dental Xray tube, the number of electrons flowing per second is measured bymilliamperetimeKVpnone of the aboveQuestion 13 of 20 14. Sharpness of image is increased byLow miliamperageSmall focal spotEgg shell effectIncreased object to receptor distanceQuestion 14 of 20 15. Bremsstrahlung radiation results from ____.Electrons interacting with tungsten nucleiX-rays interacting with electronsElectrons interacting with electronsL shell electrons falling into the K shellQuestion 15 of 20 16. Dental radiographs are the legal property of thepatientstatedentistnone of the aboveQuestion 16 of 20 17. Deterministic effects ____.Show a severity of response proportional to doseResult from particulate radiation such as alpha and beta particles but not xraysAre found after exposure to low levels of radiationAre seen only in the oral cavityQuestion 17 of 20 18. Long gray scale is achieved byIncreasing tube currentDecreasing tube currentIncreased voltageDecreasing KVpQuestion 18 of 20 19. which of the following is most valuable in determining x ray beam qualityeffective photon energyspectral distribution of photon energieshomogeneity cofficientpeak kilovoltage with added filtrationQuestion 19 of 20 20. at the atomic level x ray photons lose their energy throughcompton and photoelectric processescollisions with other photonsbremstrahlung interactionsspontaneous disintegration and mutation of photon energyQuestion 20 of 20 Loading...
