1. When placement of proximal retention locks in Class II amalgam preparations is necessary, which of the following is incorrect?One should not prepare locks entirely in the axial wall.Even if deeper than ideal, one should use the axial wall as a guide for proximal lock placement.One should not undermine the proximal enamel.One should place locks 0.2 mm inside the DEJ to ensure that the proximal enamel is not undermined.Question 1 of 20 2. Which of the following statements about an amalgam tooth/cavity preparation is true?All prepared walls should converge externally.The cavosurface margin should provide for a 90-degree amalgam margin.The enamel cavosurface margin angle must be 90 degrees.Retention form for Class Vs can be placed at the DEJ.Question 2 of 20 3. Cells found predominantly in apical part of necrosed pulp with incomplete root formation:NeutrophilsMultipotent stem cellsLymphocytesOdontoblastsQuestion 3 of 20 4. Prior to reimplantation, tooth s soaked in 3% citric acid. This is done to:Etch the surfaceRemove the PDLDisinfect the toothIncrease surface reactivityQuestion 4 of 20 5. A classic teardrop-shaped periradicular lesion on a radiograph can be indicative of a vertical root fracture. The prognosis of a vertical root fracture is hopeless, and the tooth should be extracted.Both statements are true.First statement is false, second is true.Both statements are false.First statement is true, second is false.Question 5 of 20 6. Root canal therapy was completed on a nonvital tooth that suffered trauma 5 years prior. At the time of obturation, the tooth exhibited a periapical radiolucency on radiographic examination. Radiographically, healing should be visualized in:1 month6 weeks6 months1 weekQuestion 6 of 20 7. Cytokines associated with periapical lesionsIL 6IL 1IL 8TNFQuestion 7 of 20 8. Common signs of trauma from occlusion includeRoot ResorptionNone of the aboveVertical bone lossThermal sensitivityQuestion 8 of 20 9. Pre carve burnishing useful for all except:Increases setting timeRemoves excess mercuryInitiates carvingBetter condensation of amalgam at margins of restorationQuestion 9 of 20 10. Which cavities can involve only posterior teethclass Iclass Vclass IIclass VIQuestion 10 of 20 11. Diamonds remove tooth structure more efficiently than steel burs, but they leave undesirably rough surfaces and irregular cavosurface finish lines.Both the statements are correctBoth the statements are falseThe first statement is correct, but the second is falseThe first statement is false, but the second is correctQuestion 11 of 20 12. While obturation selection of master cone is based on:The cone should have a wiggly appearance and reach within 1mm of radiographic apexThe cone must bind loosely in the canal and reach within 1 mm of the radiographic apexThe cone must fit well in the canal and be at the radiographic apexThe cone must fit well in the apical third of the canal and be within 1mm of the radiographic apexQuestion 12 of 20 13. The setting reaction of dental amalgam proceeds primarily by _____.Dissolution of the Cu from the particles into mercuryDissolution of the entire alloy particle into mercuryPrecipitation of Sn-Hg crystalsMercury reaction with Ag on or in the alloy particleQuestion 13 of 20 14. Which of the following is used for removal of broken instrument from a root canal:Barbed broachMasserann kitPeeso reamerThin tapered diamondsQuestion 14 of 20 15. Micro abrasion using modified Croll technique utilizes:37% Phosphoric Acid10% HCL18% Citric acid5 % HFQuestion 15 of 20 16. Which type of corrosion is not seen in High Copper Amalgam,Corrosion does not occur at allChemical corrosionPenetrating corrosionElectrochemical corrosionQuestion 16 of 20 17. Etching with 37% orthophosphoric acid typically creates a zone of etched enamel rods for about 15-25 micrometer. What is the depth of enamel dissolved?0-5 ?5-10 ?10-15 ?15 ?Question 17 of 20 18. The main benefit of primary incisor replantation isTo maintain child's self-esteemMaintenance of a normal anterior dentitionTo maintain child's social acceptanceTo relieve parental guiltQuestion 18 of 20 19. Which of the following is responsible for penetration of bacteria in caries of dentinPumping of bacteria into tubules due to fluid movement during masticationIncreased mobility of bacteria in dentinal tubulesThermal changes in oral cavity during masticationChange in salivary pHQuestion 19 of 20 20. The greatest potential hazard of chronic mercury toxicity occurs due toInhalation of mercury vaporsIngestion of amalgam scrap during removal of old restorationSkin contact with mercuryDuring amalgam restoration in a patient ,Question 20 of 20 Loading...
