1. Micro abrasion using modified Croll technique utilizes:37% Phosphoric Acid10% HCL18% Citric acid5 % HF 2. Which of the following materials could be used to cement a bridge and fill a cervical lesion?Glass IonomerZinc Oxide-EugenolZinc PolycarboxylateZinc Phosphate 3. A radiopaque area is observed in the dentin underlying a three month old Class II amalgam restoration. Which of the following bases was used in the restorationCalcium hydroxideZinc Oxyphosphate cementGlass ionomer cementZinc oxide and eugenol 4. A tooth which has been acid etched gets contaminated by hand piece oil What should be done:Wash with sodium hypochlorite and bondWash with alcohol, dry and bondWash with distilled water, dry and bondWash with water, 10 sec re-etch and bond 5. True about inflammation confined to pulp:Stagnation of pulp vasculatureIncreased vascularityVasoconstrictionIncreased vascular permeability 6. To avoid pulpal irritation below any restorative material, the minimum thickness of the dentine should be1.3mm1.5mm2 mm2.5 mm 7. As caries progresses from enamel to dentin and toward the pulp interproximally, the radiographic appearance resembles which of the following?V shape in the enamel with the apex toward the DEJ and V shape in dentin with apex toward the pulpV shape in enamel with apex toward the proximal surface and V shape in dentin with the pex toward the pulp, resulting in a diamond appearanceV shape in enamel with the apex toward the DEJ and V shape in dentin with the apex toward the DEJ, resulting in a bowtie appearanceV shape in enamel with the apex toward the proximal surface and V shape in dentin with the apex toward the DEJ 8. Choose the incorrect statement about Class V amalgam restorations.The outline form is usually kidney- or crescent shaped.Because the mesial, distal, gingival, and incisal walls of the tooth preparation are perpendicular to the external tooth surface, they usually diverge facially.Using four corner coves instead of two full length grooves conserves dentin near the pulp and may reduce the possibility of a mechanical pulp exposure.If the outline form approaches an existing proximal restoration, it is better to leave a thin section of tooth structure between the two restorations (< 1 mm) than to join the restorations. 9. How should the pulp be protected in deeply carious cavityCa(OH)2 used as linerUse of light cured resin modified glass ionomerUse of cavity varnishUse of chemfil varnish 10. Enameloplasty is indicated in carious tooth when caries extend to a depth of:Upto 1/2 the thickness of enamelUpto 2/3rd the thickness of enamelUpto 1/3rd the thickness of enamelEnameloplasty can be done irrespective of fissure depth 11. A patient reported back with moderate to severe pain 4 weeks after amalgam restoration of a large MOD cavity having deep proximal boxes. The most likely reason for pain isFood impaction due to faulty proximal contactsRestoration placed in supraocclusionUndetected exposure of a pulp hornGingival overhang of the amalgam at the proximal margins 12. A casting may fail to seat on the prepared tooth due to all of the following factors except _____.Temporary cement still on the prepared tooth after the temporary restoration has been removed.Proximal contact(s) of casting are too heavy or too tight.Undercuts present in prepared tooth.The occlusal of the prepared tooth was under reduced. 13. With regard to the mercury controversy related to the use of amalgam restorations, which statement is incorrect?There is lack of scientific evidence that amalgam poses health risks to humans except for rare allergic reactions.Alternative amalgam-like materials (with low or no mercury content) have promise about mercury.True allergies to amalgam rarely have been reported.Efforts are underway to reduce the environmental mercury to which people are exposed to lessen their total mercury exposure. 14. When amalgam is polished, the metal crystals at the surface get flattened. The layer is calledDalby layerBeilby layerTrilby layerWhitby layer 15. A composite restoration is to be done in case of a bleached tooth. Maximum bond strength will be achieved when composite is done after:1 day1 hour2 weeks1 week 16. Polymerization shrinkage of composite causes compression stress of1 MPa5 MPa15 MPa30 MPa 17. The main objective of cavity preparation is toPrevent cariesRestore functionTreat cariesRestore occlusion 18. When removing caries, which of the following layers of dentin are affected, but not infected, and therefore do not need to be removed?Turbid dentinInfected dentinTransparent dentinNormal dentin 19. Which of the following materials has the highest linear coefficient of expansion?AmalgamComposite resinDirect goldTooth structure 20. All of the following reasons are likely to indicate the need for restoration of a cervical notch except _____.Patient age.Esthetic concern.Tooth is symptomatic.Tooth is deeply notched axially. 21. Ultra high speed rotary instruments should not be usedTo remove unsupported enamelTo remove oblique ridgesTo remove soft cariesNone of the above 22. The reason to invert a rubber dam is _____.To prevent the dam from tearingTo prevent the underlying gingival from accidental traumaTo provide a complete seal around the teethAll of above 23. Why is etchant preferred as a gel instead of solutionTo make identification easierTo allow better control over placementTo enhance and concentrate the action of the acidTo make it easier to wash off 24. Which of the following is not true regarding the use of twist drills?Spiral drills should never be used in a slow speed hand pieceThe drill must not stop rotating while in the pin holeThey, cut only at the tipA pumping action is used to aid in chip removal 25. Common signs of trauma from occlusion includeRoot ResorptionVertical bone lossThermal sensitivityNone of the above 26. A patient comes in claiming that their holistic: doctor told him that he has an allergy to mercury and needs only white fillings. Your best response is:there is no such thing as a mercury allergy; plus, there is no mercury in amalgam fillingsyou might have mercury allergy, but that is very rare; plus, there is no mercury in amalgam fillingsthere is no such thing as a mercury allergy; plus, with proper isolation and technique, your exposure will be minimalyou might have a mercury allergy, but that is very rare; plus, with proper isolation and technique, your exposure will be minimal 27. All Class III lesions should be filled with composite resin, because they are esthetically important.both the statement and the reason are correct but not relatedthe statement is correct, but the reason is notthe statement is not correct, but the reason is correctneither the statement nor the reason is correct 28. Ultraviolet light-curing resin systems are superior to visible lightcuring resin systems because a greater depth of resin can be cured by UV light.Both statement and reason are correctThe statement is correct but the reason is incorrectThe statement is incorrect but the reason is correctBoth statement and reason are incorrect 29. 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?5-10 ?0-5 ?10-15 ?15 ? 30. In class II cavity preparation the axial depth of gingival floor should be a minimum of:0.5 mm0.8 mm1.5 mmGingival and pulpal floors should be at same level 31. Which of the following statements regarding caries risk assessment is correct?The presence of restorations is a good indicator of current caries activity.The presence of restorations is a good indicator of past caries activity.The presence of pit-and-fissure sealants is a good indicator of current caries activity.The presence of dental plaque is a good indicator of current caries activity. 32. Which of the following statements about indirect pulp caps is false?Some leathery caries may be left in the preparation.A liner is generally recommended in the excavation.The operator should wait at least 6 to 8 weeks before re-entry (if then).The prognosis of indirect pulp cap treatment is poorer than that of direct pulp caps. 33. Diamonds remove tooth structure more efficiently than steel burs, but they leave undesirably rough surfaces and irregular cavosurface finish lines.Both the statements are correctThe first statement is correct, but the second is falseThe first statement is false, but the second is correctBoth the statements are false 34. Which of the following statements is true regarding the choice between doing a composite or amalgam restoration?Establishing restored proximal contacts is easier with composite.The amalgam is more difficult and technique sensitive.The composite generally uses a more conservative tooth/cavity preparation.Only amalgam should be used for Class II restorations. 35. A major difference between total-etch and selfetching primer dentin bonding systems include all of the following except _____.The time necessary to apply the material(s)The amount of smear layer removedThe bond strengths to enamelThe need for wet bonding 36. For a dental hand instrument with a formula of 10-8.5-8, the number 10 refers to _____.The width of the blade, in tenths of a millimetreThe primary cutting edge angle, in centigradesThe blade length, in millimetresThe blade angle, in centigrade 37. A patient walks into your office for an emergency visit. He asks the receptionist for a cold glass of water and seems to be tilting his head sideways as to hold the water on one side of his mouth. Immediately, you suspect which reason for his visit?pulp necrosisreversible pulpitissymptomatic irreversible pulpitisasymptomatic apical periodontitis 38. Which of the following is not true when fixing the matrix band for filling a Class 2 cavity with amalgam? The matrix band shouldFit the cervical margin of the proximal box looselyBe higher than the occlusal surface of the toothSupport the marginal ridge of the restoration during amalgam packingProvide a physiological contour for the proximal surface of the restoration 39. ____ is degraded by Streptococcus mutans into ____ and ___ , thereby causing caries initiation and progression.sucrose, glucans, lactic acidglucose, glucans, lactic acidsucrose, glucose, acetic acidglucose, sucrose, acetic acid 40. The maximum chances of pulpal necrosis are seen in:IntrusionExtrusionSubluxationAvulsion 41. What should be the shape of the axial wall of a Class 5 cavity in a maxillary bicuspid, when seen in a transverse section?ConcavePyramidalStraightConvex 42. Which of the following microorganisms is associated with dental cariesStr. SanguisStr.salivariusStr.mitisStr.rattus 43. The most frequently quoted disadvantage of using the rubber dam isTime consumptionCostStaff allergies to materialNone of the above 44. Alternating rotational technique uses which blank designTriangular blank with cutting tipTriangular without cutting tipSquare with cutting tipSquare without cutting tip 45. When restoring a tooth with composite resins, the enamel margins are bevelled in order toExpose the ends of the enamel rods for etchingImprove wettability of the tooth surface during bondingSmoothen the enamel and cavosurface marginsNone of the above 46. A dentin bonding agent has two ends: hydrophilic and hydrophobic. The hydrophobic end binds to:Collagen in dentinComposite resinSmear layerEnamel 47. All of the following statements about slot retained complex amalgams are true except _____.Slots should be 1.5 mm in depth.Slots should be 1 mm or more in length.Slots may be segmented or continuous.Slots should be placed at least 0.5 mm inside the DEJ. 48. When comparing pin retention with slot retention for a complex amalgam restoration, which of the following statements is false?Slots are used where vertical walls allow opposing retention locks.Slots provide stronger retention than pins.Slots and grooves can be used interchangeably.Pin retention is used primarily where there are few or no vertical walls 49. A Class V buccal cavity is to be prepared on a mandibular first premolar under a Rubber dam clamped on the tooth with a No.212 clamp. The hole for the first Premolar should be punchedSlightly lingual to the other holes in the archSmaller than normalSlightly facial to the other holes in the archAs is normally done 50. While using Kalzinol as a temporary cement, what should be the thickness of material1mm2 mm3 mm4 mm 51. Micro abrasion is done using:10% HCL37% phosphoric acid20% Nitric acid10% HF acid 52. ND: YAG laser wavelength10.60 um0.60 um1.060 um300 um 53. For a gold casting alloy, which of the following is added primarily to act as a scavenger for oxygen during the casting process?CopperPalladiumSilverZinc 54. Beveling the gingival cavosurface margin of the proximal box of a Class II amalgam preparation on a permanent tooth:Should result in a long bevelIs contraindicated because of the low edge strength of amalgamhould remove unsupported enamel that may fractureIs unnecessary since the tooth structure in this area is strong 55. When condensing gold foil, stepping of the condenserProduces a denser restoration and reduces the time of condensationProduces a denser restoration but increases the time of condensationShould involve overlapping the nib by one-half its diameterShould involve overlapping the nib by one-fourth its radius 56. Sharp pain in tooth is mediated by:A ?A ?Sharpeys fibresC fibres 57. A 16 year old boy reports with a history of traumatic injury 3 hours back leading to the avulsion of the tipper permanent incisor. The tooth is present with the patient. Which of the following should be the line of treatmentWash the tooth with Normal saline, clean, replace the tooth in the socket, check with a radiograph and splintScrape the eriodontal ligament curette the socket replace and splintSeal the apex of the tooth with retrograde amalgam restoration and replace the tooth.Clean the tooth, autoclave, replace and splint 58. Due to slowly advancing caries involving dentin, which of the following type of dentin may form in responseSecondaryTertiaryScleroticReparative 59. Extension for prevention is directly related to theOutline form of the cavityRemoval of unsupported enamel rods from the proximal surfacesRounding of the line anglesDepth of the cavity 60. Retentive locks in the proximal box for a Class II amalgam preparation should be:Square shaped, elongated, placed at DEJSharp, elongated, placed within the dentinRound, elongated, placed in the dentinSquare shaped, placed in dentin 61. A cold test reveals a lingering pain. You ask the patient to raise her hand until the pain subsides. The patient raises her hand for about 8 seconds. What does this data suggest?Pulp necrosisSymptomatic irreversible pulpitisReversible pulpitisSymptomatic apical periodontitis 62. The pupal response to glass ionomer cement is similar to that forZinc oxide - eugenol cementCopper phosphate cementResin cementsPolycarboxylate cement 63. Which of the following is least associated with the short-term strength of a materialCreepModulus of elasticityResilienceBrittleness 64. The last step in cavity preparation isResistance - retention formFinishing of enamel wallsRemoval of cariesDebridement 65. Following restoration with gold, the tooth was sensitive to pressure, cold and heat, the best course of action is toRemove the restoration and start endodontic treatmentRemove the restoration and place a sedative temporary restorationRelieve the tooth of any occlusal contactObserve for two weeks and then decide 66. Triturating a dental amalgam will _____.Reduce the size of the alloy particlesCoat the alloy particles with mercuryReduce the crystal sizes as they formDissolve the alloy particles in mercury 67. Which of the following is true regarding fluoride release from GIC:Very slow during the first few daysRapid after 1 monthRapid early but falls with decreasing concentration of fluorideIt remains the same 68. Coves are given in:Floor wallAxial wallPulpal floorMesiofacial in gingival surface 69. Which of the following is not a risk when using air as a coolant cutting with high speedsConverging proximal wallsTooth may be dehydratedPulp may be cooled below the danger pointTooth may become hypersensitive 70. Restoration of an appropriate proximal contact results in all of the following except _____.Reduction/elimination of food impaction at the interdental papillaProvides appropriate space for the interdental papillaProvides increased retention form for the restorationMaintenance of the proper occlusal relationship 71. Second digit in 4-digit instrument formula indicatesBlade lengthBlade anglePrimary cutting-edge angleBlade width 72. The shank of a dental hand cutting instrument joints the blade to theHandHandlePrimary cutting edgeSecondary cutting edge 73. In a class I cavity for amalgam, the mesial and distal walls show slight divergence towards the occlusal surface. This is done to:Prevent placing amalgam margin at area of cuspal contact of opposite toothIncrease bulk of amalgamPrevent undermining of marginal ridgesAllow easier condensation of amalgam 74. Retention of an inlay is influenced primarily by:Near parallel axial wallsFlat, pulpal and gingival wailPresence of contra bevelsPreparation of slots and coves 75. The setting reaction of dental amalgam proceeds primarily by _____.Dissolution of the entire alloy particle into mercuryDissolution of the Cu from the particles into mercuryPrecipitation of Sn-Hg crystalsMercury reaction with Ag on or in the alloy particle 76. All of the following statements are true concerning posterior composite restorations EXCEPT one. Which one is the EXCEPTION?Posterior composite restorations are frequently indicated in the treatment of occlusal lesions that allow conservative preparationsPosterior composite restorations are contraindicated in a patient with heavy occlusion (bruxism)Posterior composite restorations may be indicated for the restoration of class ii cavities in premolar teeth where the appearance is very important, the cavity margins are in the enamel, and the occlusal contacts are on the enamelPosterior composites are contraindicated for cusp replacements unless a dry operating field is maintained 77. Recognition of wall convergence angles in crown preparation will determine if undercuts are produced when taper is too small and if retention is undermined when taper is too large. What degree of wall convergence during crown preparation will give the prosthesis optimal retention?1 to 3 degrees3 to 6 degrees4 to 8 degrees6 to 9 degrees 78. Distance of the blade from the shank to have anti-rotational design of instrument should be2 mm3 mm4 mm5 mm 79. The ideal amount of time from placing an indirect pulp cap until reopening the tooth to remove the remaining decay is:1 month3 - 4 months1 yearNever, unless the tooth becomes symptomatic there is no need for further treatment 80. All of the following precautions should be taken when making an acrylic resin Temporary restoration for an MOD onlay preparation, exceptUndercuts in the preparation should not be blocked out as these will provide retentionPolymerization should not go to completion in the mouthopen margins should be avoidedOverextended resin should be removed 81. What are the structural components of composite?Polymer matrix and filler particlesA coupling agent and initiatorPolymer matrix and coupling agentsAll of the above 82. 50% sulfuric acid is useful forCleaning the prepared tooth surface prior to crown cementationAcid etching of enamel surfacesPickling gold alloy castingsDegassing of gold foil 83. Which one of the following acids is generally recommended for etching tooth structure?Maleic acidPolyacrylic acidPhosphoric acidTartaric acid 84. Etchant acts on mostly which part of enamel rodsHead regionTail regionPeriphery of head regionEqually all parts 85. Which type of corrosion is not seen in High Copper Amalgam,Chemical corrosionElectrochemical corrosionPenetrating corrosionCorrosion does not occur at all 86. Which of the following is not one of the four zones in four-handed dentistry:Operator zoneAssistant zonePatient zoneStatic zone 87. Retention form for a Class II amalgam preparation is ensured byThe gingival seatGrooves placed at the expense of the axiofacial and axiolingual line anglesParallelism of buccal and lingual wallsAll of the above 88. Preventive measures to avoid cracked teeth, include all of the following, exceptAvoiding full coveragePlacing pins horizontally into the dentin of the buccal and lingual internal walls and filling the cavity with amalgamNone of the aboveOnlaying cusps with reverse bevels 89. Which of the following statements is not true regarding bonding systems?Even though dentin bonding occurs slowly, it results in a stronger bond than to enamel.Enamel bonding occurs quickly, is strong, and is long-lasting.One-bottle dentin bonding systems may be simpler but are not necessarily better.Dentin bonding is still variable because of factors such as sclerosis, tubule size, and tubule location. 90. Which of the following is not a sign or symptom of a split tooth?Sensitivity to thermal changeLoss of sensitivity to pressureOccasional mild to moderate painSplit not visible on radiographs 91. Affected dentin differs from infected dentin in that, it hasA soft leathery textureBeen invaded by microorganismsNot been invaded by microorganismsBeen calcified 92. Which zone in dentinal caries is associated with degeneration in inter tubular dentin and deposition of prism like structures in dentin tubulesSub transparent dentinTransparent dentinNormal dentinTurbid dentin 93. The primary contraindication(s) for the use of a composite restoration is (are) _____.Occlusal factorsInability to isolate the operating areaNonesthetic areasExtension onto the root surface 94. When preparing a Class II cavity for amalgam, the proximal portion shouldNot have sharp external point anglesIn normal circumstances be extended into the gingival creviceNever extend below the contact areaBe extended upto 4mm into dentin 95. Acute dental caries differs from chronic dental caries, in that, there isGreater depth than width to the lesionUsually very little sensitivityMuch greater pigmentation of the lesionall of the above 96. In comparison to amalgam restorations, composite restorations are _____.StrongerMore technique-sensitiveMore resistant to occlusal forcesNot indicated for Class II restorations 97. A finishing bur has how many blades compared to a cutting bur?Fewer blades.Same number of blades.More blades.Number of blades is unrelated to the bur type. 98. Smooth surface caries refers to _____.Facial and lingual surfacesOcclusal pits and groovesMesial and distal surfacesBoth A and C. 99. When preparing a Class III or IV composite tooth preparation, which of the following is false regarding placement of retention form?Often involves gingival and incisal retentionIs placed at the axiogingival line angle regardless of the depth of the axial wallMay be needed in large prepsIs usually prepared with a No. . round bur 100. What is run out of a burNumber of flutes on the head of a carbide burMaximum displacement of a bur head from its long axis of shaft during rotationMaximum displacement of bur head during active cutting of toothThe ability of a bur to cut through 2 mm of dentin Loading...
