1. One of the most serious procedural errors that can occur during root canal therapy is instrument aspiration. What is the most important precaution an operator can take to prevent instrument aspiration?Recapitulate between each fileOnly use rotary filesUse adequate lubrication during instrumentationProper rubber dam isolationQuestion 1 of 20 2. Gingival bevels can be safely and accurately placed usingMargin trimmersSafe sided diamond disksAngle formersMedium sandpaper disksQuestion 2 of 20 3. 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:6 weeks1 week1 month6 monthsQuestion 3 of 20 4. In office whitening has what effect on tooth colored restorative materialDecay of tooth and marginal failureMild chemical softeningNo effectHybrid composite and GIC significant effect; no effect on RM-GICQuestion 4 of 20 5. Features of focal sclerosing osteomyelitis often include:None of the choices is true.A radiolucent lesion which, in time, becomes radiopaque.A history of recent restoration of the tooth in question.A nonvital pulp test.Question 5 of 20 6. Chances of root fracture are higher with use of:Fiber postCemented postFriction lock postThreaded postQuestion 6 of 20 7. Following the placement of an amalgam restoration, the tooth is most sensitive toColdBitterHeatSweetQuestion 7 of 20 8. Which type of corrosion is not seen in High Copper Amalgam,Corrosion does not occur at allPenetrating corrosionElectrochemical corrosionChemical corrosionQuestion 8 of 20 9. With regard to the mercury controversy related to the use of amalgam restorations, which statement is incorrect?Efforts are underway to reduce the environmental mercury to which people are exposed to lessen their total mercury exposure.There is lack of scientific evidence that amalgam poses health risks to humans except for rare allergic reactions.True allergies to amalgam rarely have been reported.Alternative amalgam-like materials (with low or no mercury content) have promise about mercury.Question 9 of 20 10. When restoring severely broken down teeth, which pins are most retentive?ThreadedFrictionalCementedInlayQuestion 10 of 20 11. Which of the following are similarities between amalgam Class II restorations and inlay Class II restorations, Exceptdepth into dentinaxiopulpal line angle shapeconvergent walls on the occlusal surfaceocclusal isthmus widthQuestion 11 of 20 12. Type of bacteria found in pulpitis:Gram negativeAnaerobic mixed infectionPolymicrobial facultative anaerobicGram positiveQuestion 12 of 20 13. The outline form of the access cavity of which of the following teeth is trapezoid in shape?Mandibular first molar and mandibular second molarMandibular first molar and maxillary second molarMaxillary first molar and maxillary second premolarMaxillary first molar and mandibular first molarQuestion 13 of 20 14. There is abundant evidence that the initiation of dental caries requires a high proportion of:Lactobacillus within salivaStreptococcus mutans within salivaLactobacillus within dental plaqueStreptococcus mutans within dental plaqueQuestion 14 of 20 15. Which tooth has a wide variation in root canal anatomy:Maxillary second premolarMandibular second premolarMaxillary first premolarMandibular first premolarQuestion 15 of 20 16. The primary function of root canal sealers is:To aid in creating apical seal when gutta-percha cannot adequately seal the apexTo fill the space between a loosely fitting GP cone and canal wallsTo fill the residual space between the GP cones and canal walls following condensationTo prevent growth of microorganisms in periradicular areaQuestion 16 of 20 17. Possible etiology of internal resorption:Necrosis of pulpLuxation injuryThe presence of low grade chronic pulpitisFurcation involvementQuestion 17 of 20 18. Necrosis affects periapical cementum less than bone because:Cementum is vascular while bone is avascularCementum is more resistant to ResorptionMore number of pathways of spread of inflammation in boneInfection involves bone preferentiallyQuestion 18 of 20 19. The main objective of cavity preparation is toTreat cariesRestore occlusionRestore functionPrevent cariesQuestion 19 of 20 20. What is the disadvantage of resin restoration when using for class 2 cavity:Low wear resistanceLow flexure strengthMarginal leakageLow tensile strengthQuestion 20 of 20 Loading...
