RestoCompre Flashcards by Onycha Renolla

OPERATIVE DENTISTRY 1 PRELIM EXAM

In a carious lesion in which caries has extended into dentin, which of the following zones contains infected dentin and is not capable of remineralization?
A. Normal dentin
B. Subtransparent dentin
C. Transparent dentin
D. Turbid dentin
E. Eburnated dentin

D. Turbid dentin

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A 20-year-old female presents for her initial dental examination and prophylaxis. During the examination, you observe wear on the occlusal surfaces of many posterior and anterior teeth. The wear on the posterior teeth are cup like and smooth, and on the anterior, it has smoothed out the lingual anatomy of the incisors. This is most typical of which type of wear?
A. Attrition
B. Erosion
C. Abrasion
D.Abfraction
D. Bruxism

B. Erosion

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There are four zones of carious enamel, the zones of incipient lesions. Which of the four zones is the largest?
A. Translucent zone
B. Dark zone
C. Body zone
D. Surface zone
E. All zone

C. Body zone

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All of the following are associated with Rampant caries except:
A. Acute onset
B. Rapid progression
C. Children
D. Deep and wide
E. Associated with pain

D. Deep and wide

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Discovered the role of microorganism in disease, a finding that would have a significant effect on the developing dental and medical profession
A.G.V BLACK
B. LOIUS PASTEUR
C. CHARLES WOODBURY
D. WALDON FERREIR

B. LOIUS PASTEUR

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Dramatically dental caries increased towards the end of 17 century and continued to increased until the early_
A. 1826
B. 1970
C. 1999
D.20th century

B. 1970

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In a three number formula stamped on the side of the handle of an instrument, the third number represents the
A. Width of the blade
B. Length of the blade in mm
C. Angle of the blade from the long axis of the shaft
D. Angle of the cutting edge from the shaft long axis

C. Angle of the blade from the long axis of the shaft

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Three factors required for the initiation of dental caries are ;
A. Polysaccharides, microorganism, enamel
B. Enamel lamella, lactobacilli, polysaccharides
C. Susceptible tooth, suitable substrate, bacterial enzymes system
D. Bacterial plaque, suitable tooth, polysaccharides

C. Susceptible tooth, suitable substrate, bacterial enzymes system

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The type of caries that appears very dark brown to black, hard to touch, smooth and has stopped progressing;
A. Rampant caries
B. Arrested caries
C. Chronic caries
D. Compound caries

B. Arrested caries

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The transparent layer is a zone of carious dentin that is softer than normal dentin and shows further loss of mineral from the intertubular dentin. Stimulation of this region will not produces pain, no bacteria are present.
A. 1st statement is correct, 2nd statement is incorrect
B. 1st statement is incorrect, 2nd statement is correct
C. both statement are correct
D.both statement are incorrect

A. 1st statement is correct, 2nd statement is incorrect

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The surface zone is relatively unaffected by the caries attack. It has a lower pore volume than the body of the lesion and a radiopacity comparable to affected adjacent enamel.
A. both the statement and the reason are correct and related
B. both the statement and the reason are correct but not related
C. the statement is correct, but the reason is not
D. the statement is not correct, but the reason is correct
E. neither the statement nor the reason is correct

C. the statement is correct, but the reason is not

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G.V. Black concluded that the following areas on tooth surface are relatively not self-cleansable:
A. Pits and fissures
B. Tips and cusps
C. crest of marginal ridges
D. all inclined planes of cusps and ridges E. None of the above

A. Pits and fissures

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Chisel are used primarily to cut enamel. Hatchets are primarily used to cut dentin.
A. Both statement are true.
B. Both statement are false.
C. 1st statement is true, 2nd statement is false
D. 1st statement is false, 2nd statement is true

C. 1st statement is true, 2nd statement is false

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Caries initiation requires the following EXCEPT:
A.Host
B. bacteria
C. carbohydrates
D. saliva
E. time

D. saliva

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Which will produce the smoothest amalgam surface and therefore would be the last polishing instrument among the following?
A. Finishing burs
B. Green carrot stone
C. White carrot stone
D. Greenie point
E. Brownie point

D. Greenie point

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Chronic caries is characterized by which of the following?
A. Pain is common
B. Slowly progressing or arrested
C. Entrance to the lesion is small
D. Lession is deep and narrow

B. Slowly progressing or arrested

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Instruments used for handling resins are made of:
A. Carbon steel
B. Teflon-coated metal
C. Platinum
D. Gold

B. Teflon-coated metal

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18.Dental Caries depends on the balance between demineralization of organic and inorganic substance. Demineralization occurs when the pH level of the mouth drops below 4.
A.Both statements are correct
B.Both statements are incorrect
C.1st statement is correct,2. statement is incorrect
D.1st statement is incorrect, 2nd statement is correct

D.1st statement is incorrect, 2nd statement is correct

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When is dental caries said to be “extensive”?
A. It involves more than one tooth.
B. The distance between the infected dentin and pulp is less than 2 mm.
C. There is pulp exposure.
D. The distance between the infected dentin and pulp is less than 1 mm.

D. The distance between the infected dentin and pulp is less than 1 mm.

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The rate of which carious destruction of dentin progresses tends to be slower in older adults than in young person because of the
A. Change in pH of saliva with aging
B. Generalized dentinal scheming with aging.
C. Increase the intertubular organic content
D. Decrease in sugar consumption of older adult

B. Generalized dentinal scheming with aging.

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The following are the main factors that lead to the development of caries according to the modified Keyes-Jordan diagram except.
A. Time
B. cariogenic biofilm
C. poor oral hygiene
D. fermentable CHO’s

C. poor oral hygiene

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Positioning of the fingers in this manner creates a triangle of forces or tripod effect, which enhances the instrument control.
A. Palm and thumb grasp.
B.Pen grasp.
C. modified pen grasp
D. modified palm grasp

C. modified pen grasp

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For a dental hand instrument with a formula of 10- 8.5- 8, the number 10 refers to
A. The width of the blade, in tenths of a millimeter
B. The primary cutting-edge angle, in centigrades
C. The blade length, in millimeters
D. The blade angle, in centigrade

A. The width of the blade, in tenths of a millimeter

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Periodic examinations, bite-wing radiographs, and prophylactic procedures were the most common dental procedures in;
A. 1999
B. 1887
C. 1926
D. 1840

A. 1999

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25. Cutting instruments have formula describing the dimensions and angles of the working end. The first number indicates the blade in tenths of a millimeter A.False B. true

A.False

26. What is the most effective community-based intervention to control dental decay? A. School-based dental sealant programs B. Community health centers with dental clinics C. Fluoridation of drinking water D. Introduction of sugarless chewing gums

C. Fluoridation of drinking water

27. A tapered fissure bur can be described as a slightly tapered cone, the small end of the cone directed towards the bur shank. A. 1st statement is correct, 2nd statement is incorrect B. 1st statement is incorrect, 2nd statement is correct C. Both statement are correct D. Both statement are incorrect

C. Both statement are correct

28. Which of the following terms refers to lose enamel due to some sort of outside mechanical action? A. Abfraction B. Abrasion C. Attrition D. Erosion

B. Abrasion

29. Saliva has a direct antibacterial immunoglobulin. The salivary immunoglobulin found in saliva is A. IgG B. Ig A C. IgM D. IgE

B. Ig A

30. Salivary glands produce antimicrobial products, buffer reduce the potential for acid formation not causes to ph to rise. A. Both statements are correct. B. Both statements are incorrect C. 1st statement is correct, 2nd statement is incorrect D. 1st statement is incorrect 2nd statement is correct

C. 1st statement is correct, 2nd statement is incorrect

Bonus 31. Which of the following statements regarding caries risk assessment is true? A. The presence of restorations is a good indicator of past caries activity. B. The presence of restorations is a good indicator of past caries activity. C. The presence of plaque biofilm is a good indicator of current caries activity. D. The presence of pit-and-fissure sealants is a good indicator of current caries

32. The modified pen grasp is the most common instrument grasp in dentistry; this is because it allows for the greatest intricacy and delicacy of touch. A. both the statement and the reason are Correct and related B. Both the statement and the reason are correct but not related C. The statement is correct, but the reason is NOT correct D. The statement is NOT correct, but the reason is Correct E. neither the statement nor the reason is correct

A. both the statement and the reason are Correct and related

33. Hand cutting instruments are manufactured from two main materials: carbon steel and stainless steel. In addition, some instruments are made with diamond inserts to provide more durable cutting edges. A. Both statement are correct and related B. Both statement are incorrect and not related C. Ist statement is correct, 2nd statement is incorrect D. Ist statement is correct, 2nd statement is correct

C. Ist statement is correct, 2nd statement is incorrect

34. Which of the following terms refers to tooth structure loss in the cervical area secondary to biomechanical loading? A. Abfraction B. Abrasion C. Attrition D. Erosion

A. Abfraction

35. Caries activity could well increase; A. During pregnancy B. All of these C. following serious emotional problem D. Depression stage

B. All of these

36. In the Zone of dentinal sclerosis Intertubular dentin is demineralized, damage to the odontoblastic zone process is not apparent. A. 1st statement is true, 2nd statement is false B. 1st statement is false, 2nd statement is true C. both statement are true D. both statement are falsely

A. 1st statement is true, 2nd statement is false

37. In cavity preparation we need different kinds of burs, it is a hand instrument having nib for fattening the pulpal floor A. 1st statement is correct ,2nd statement is incorrect B. 1st statement is incorrect, 2nd statement is correct C. both statement are correct D. both statement are incorrect

A. 1st statement is correct ,2nd statement is incorrect

38. It is the destruction of pathogenic micro-organism existing in their vegetative state on living tissue. A. sterilization B. antisepsis C. disinfection D. antiseptic

B. antisepsis

39. Carious lession that develop at the margins of restorations; A. Primary caries B. chronic caries C. acute caries D. secondary caries

D. secondary caries

40.Incipient caries on proximal surfaces is usually found; A.Lingual to the contact area B. At the contact area C, facial to the contact area D. occlusal to the contact area

B. At the contact area

41. Caries is primarily cause by; A. Carbohydrates. B.Protein accumulation. C. plaque D. saliva

C. plaque

42.On a carbide bur, greater number of cutting blades results in; A. Less efficient cutting and a smoother surface B. More efficient cutting and smoother surface. C. Less efficient and rougher surface D. More efficient and rougher surface

A. Less efficient cutting and a smoother surface

43. Caries proceeds from DEJ to enamel; for smooth surface the base is on the DEJ and the apex is on enamel. A. backward caries. B. forward caries C. incipient caries. D. chronic caries

A. backward caries.

44. Instrumentation will produce heat, heat produces 130 degrees fahrenheit results to permanent pulpal damage. A. 1st statement is correct, 2nd statement is incorrect B. 2nd statement is correct, 1st statement is incorrect C. both statement are correct D.both statement are incorrect

C. both statement are correct

45.Burs are cutting instruments, what is the side that faces the tooth structures. A. Rake B. steel C. head D. body

A. Rake

46. Hoe is used to define line and points angle of class Ill and class v, angle former is used to establish retention form. A. 1st statement is right, 2nd statement is wrong B. 1st statement is wrong, 2nd statement is right C. Both statement are right D. Both statement are wrong

A. 1st statement is right, 2nd statement is wrong

47.Operative dentistry is foundation of the dentistry from Which all branches have evolved, which will require full coverage restorations for correction. A. 1st statement is correct, 2nd statement is incorrect B. 1st statement is incorrect,2nd statement is correct C. both statement are correct D. both statement are incorrect

D. both statement are incorrect

48. Which of the following describes the microscopic form of incipient pit and fissure caries in enamel? A. A cone-shaped lesion with the apex toward the DEJ B. A cone-shaped lesion with the apex toward the outer surface C. A circular-shaped lesion, open at the surface D. A circular-shaped lesion, appearing along fissures

B. A cone-shaped lesion with the apex toward the outer surface

49. Which of the following is the least likely to cause rampant caries in geriatric patients? A. Poor oral hygiene B. A decreased salivary flow C. A change in the oral microflora D. The side effects of medication

C. A change in the oral microflora

50. Various instruments that are used for isolation to separate the operating area from saliva, blood and reduce access of contamination. A. Autoclave B. Sterilization C. isolating instrument D. rubber dam

C. isolating instrument

51.It is the separation and or loss of tooth structure as a result of trauma A. Attrition B. Abfraction C. Fracture D. Abrasion

C. Fracture

52.It is classification system for tooth fractures based on the extent of damage to the tooth structure. A. Ellis and Davey classification B. G.V Black classification C. WHO classification D. Downy and WHO classification

A. Ellis and Davey classification

53. _results from flexure and fatigue of enamel and dentin at a location removed from the, resulting in a wedge- shape cervical lesion A. Attrition B. abfraction C. erosion D. abrasion

B. abfraction

54. The x ray of choice for detecting proximal caries of anterior teeth is? A. Periapical x-ray B. Bitewing x-ray C. occlusal xray D. none of the above

A. Periapical x-ray

55. Senile carious lesions are most commonly found exclusively on the following areas of the teeth. A.Pits and fissures B. Occlusal, incisalfacial, lingual embrassures C. inclined plain of cusps D. root surfaces of teeth E. all of the above

D. root surfaces of teeth

56. Help you put a high polish on interproximal areas while decreasing the tenacity of interproximal stains. A. Flex strip B. celluloid strips C. matrix strips D. wedges

B. celluloid strips

57. When removing caries, which of the following layers of dentin are affected, but not infected, and therefore do not need to be removed? A. Turbid dentin B. Infected dentin C. transparent dentin D. normal dentin E. subtransparent dentin

C. transparent dentin

58. The rate of senile caries is increasing, in part, because of the increase in gingival recession A. both the statement and the reason are correct and related B. both the statement and the reason are correct but not related C. the statement is correct, but the reason D. the statement is not correct, but the reason is correct E. neither the statement nor the reason is correct

A. both the statement and the reason are correct and related

59. Specific microorganism selectively adhere to certain locations on the teeth, not influencing the over all structure and composition of dental plaque. A. both statements are true B. both statements are false C. the statement is true, the second is false D. the first statement is false, the second is true

C. the statement is true, the second is false

60. To polish a restoration, you will likely use a bur with less cutting blades. This is because a bur with less cutting blades will cut more efficiently. A. both the statement and the reason are correct B. both the statement and the reason are incorrect C. the statement is correct, but the reason is not D. the statement is not correct, but the reason is correct

D. the statement is not correct, but the reason is correct

OPERATIVE DENTISTRY 1 MIDTERM EXAM 1. A prepared wall which is usually flat and perpendicular to the occlusal forces directed occluso gingivally. a. Pulpal floor b. axial wall c. gingíval floor d. proximal wall

a. Pulpal floor

2. External wall is a wall in the prepared tooth that extends to the external tooth surface, what are the external wall found in DO class II cavity preparation a. Distal and buccal wall b. mesial and buccal wall C. axial and mesial wall d. lingual and axial

b. mesial and buccal wall

3. Intracoronal restoration is placed directly into the tooth preparation while extracoronal restoration uses an direct technique with impression to make the necessary tooth restoration- a.1st statement is correct, 2nd statement is incorrect b.1st statement is incorrect, 2nd statement is correct c. both satement are correct d. both statement are false

a.1st statement is correct, 2nd statement is incorrect

4. Prepare tooth such that under masticatory forces and restoration will not fracture and restoration is displaced. Restoration is usually required to repair a diseased, injured or defective tooth structure. a.1st statement is true, 2nd statement is false b.1st statement is false, 2d statement is true c. both statement are true d. both statement are false

b.1st statement is false, 2d statement is true

5. Factors Affecting Restorations of a Tooth : a. Removal of all defects b. location of tooth c. provide necessary pulp d. replacement of old,defective restoration

b. location of tooth

6. Incorporate all faults in preparation Place all margins of preparation in a position to afford good finishing of the restoration. a. Outline form b. resistance form c. retention form d. convenience form

a. Outline form

7. It should consist of smooth curves, straight lines and rounded line and point angles. Enamel which is supported by dentin as well as the demineralized enamel should be removed since it is liable to fracture. a. 1st statement is correct, 2nd statement is incorrect b. 1st statement is in correct, 2nd statement is correct C. both satement are correct d. both satement are incorrect

a. 1st statement is correct, 2nd statement is incorrect

8. It includes the relationship of occlusal walls from cavosurface angle to the pulpal floor. Preparation depth should be at least 1.5 to 2.0 mm vertical from the cavosurface margin to the pulpal floor and at least 0.2 to 0.5 mm in dentin so as to provide adequate strength to resist fracture due to masticatory forces. a.1st statement is correct, 2nd statement is incorrect b.1st statement is incorrect, 2nd statement is correct c. both statement are correct d. both statement are incorrect

c. both statement are correct

9. Enamel which is unsupported by dentin as well as the demineralized enamel should be removed since it is liable to fracture. a .external outline form b. internal outline form c. resistance form d. retention form

a .external outline form

10. Be placed into dentin 0.5-0.8 mm from DEJ Follow curvature of dentinoenamel junction bucolingually a. internal wall b. axial wall c. dentino enamel wall d. axio gingival wall

b. axial wall

11. In a patent with high caries risk it is always preferred to place gingival margin further into the embrasure a. true b. false

a. true

12. Outline form is limited by extent of the lesion. Extensions are made mesially, distally, occlusally and gingivaly till sound tooth structure is reached. Axial depth is limited to_-_mm pulpally. a. 0.5-1.25 b. 0.2-0.8 C. 0.8-1.25 d. 0.8-1.20

C. 0.8-1.25

13. This procedure should not be used unless a fissure can be made into a groove with a saucer base converting it into a smooth groove making it self cleansable area does not extend the outline form. a extension for prevention b. enameloplasty c. hypoplasia d. finishing stage

b. enameloplasty

14. This helps the tooth to resist occlusal loading by virtue of being perpendicular to the masticatory forces directed along the long axis of the tooth a. Resistance form b. retention form c. outline form d. convenience form

a. Resistance form

15. The external walls diverge outward, retention grooves/coves are the primary retention forms. This is retention for a. Class V b. Class Il C. Class III d. Class IV

a. Class V

16. Pulp irritants are caused by bacterial irritants such as chronic trauma and parafunctional habits, thermal changes are generated during avulsion, erosion and internal resorption. a. 1st statement is true, 2nd statement is false b. 1s statement is false, 2nd statement is true c. both statement are true d. both statement are false

d. both statement are false

17. In class il preparations, access is made through proximal surface for convenience form. Proximal clearance is provided from the adjoining tooth during class Il tooth preparation. a. 1st statement is correct, 2nd statement is incorrect b. 1st statement is incorrect, 2nd statement is correct c. both statement are correct d.both statement are incorrect

b. 1st statement is incorrect, 2nd statement is correct

18. Use low speed handpiece with the round bur or spoon excavator with light force and a wiping motion. Use of a large spoon excavator decreases the chance of a pulpal exposure. a. Initial stage b. final stage c. convenience stage d. enameloplasty

b. final stage

19.Liners and varnishes are used where preparation depth is shallow and remaining dentin thickness is more than _ to provide Barrier to protect remaining dentin and pulp. a. 2mm b. 0.2mm C. 1.5mm d. 0.5mm

a. 2mm

20. Proximal wal, at the axiofacial and axilingual line angles are location of retention for. a. Class I b. Class V c. Cass Ill d. Class Il

d. Class Il

21. Liners usually do not have sufficient thickness, hardness and strength to be used alone in the deep preparation. A. TRUE b. FALSE

b. FALSE

22. 11 years old male patient come inside the clinic for tooth restoration, upon checking, the tooth number 65 has wide caries brown and leathery texture of dentin. Final stage of treatment is considered a. CaOh b. GIC C. ZOE d. Composite

b. GIC

23. Caries penetrates the enamel and may involve one half of the dentin, but not to the extent of endangering the pulp. In these cases, to protect the pulp, liner is applied to cover the axial and/or pulpal wall. Then, base is placed over the liner. After the base material hardens, permanent restoration is done. a. Moderate carious lesion b.shallow carious lesion b. shallow carious lesion c. 2mm of the dentin left before the pulp d. <.5mm of dentin left before the pulp

d. <.5mm of dentin left before the pulp

24. The copal resin varnish is placed as liner in the cavity preparation, before the amalgam is condensed, provides: a. Sealing of the margins lifetime b. Long-term sealing of the margins c. short-term sealing of the margin d. no sealing of the margins

c. short-term sealing of the margin

25.During cavity preparation of class Il Cavity, which of the following permanent teeth pulp horns will be the most subject to accidental exposure? a. Distofacial of a maxillary 1st molar b. distofacial of mandibular 1st molar c. facial of mandibular 1st premolar d. lingual of mandibular 1st molar line angle of a class II

c. facial of mandibular 1st premolar

26. Placing a bevel at the axiopulpal line angle a. Increases convenience form b. Decreases stress concentration C. increases retention form d. defective restoration

b. Decreases stress concentration

27. GMT is used to bevel gingival margins, both permanent and primary teeth should be beveled in the gingival margin, due to apical orientation of the enamel rods are apically oriented. a. 1st statement is true, 2nd statement is false b. 1st statement is false, 2nd statement is true c. both statement are true d. both statement are false

a. 1st statement is true, 2nd statement is false

28. The ideal depth of cavity preparation is_ 1. 1.5-2mm from the central groove 2. 0.3-0.5mm from the DEJ 3. 1.5-2mm from the marginal ridge 4. 0.5-1mm from the DEJ a.1&2 b. 2&3 C.1&4 d. 3&4

a.1&2 1.5-2mm from the central groove 2. 0.3-0.5mm from the DEJ

29. Each of the following determines the outline form for class Il composite restoration, except a. Convenience for access b. size, shape & location of caries c. extension for prevention

c. extension for prevention

30.Material contraindicated as a base under resin restoration- a. Carboxylate cement b. calcium hydroxide c. zinc oxide eugenol d. zinc phosphate

c. zinc oxide eugenol

31. Discoloration of the tooth under big amalgam restoration can be prevented by: a. Using correct alloy mercury ratio b. Using zinc phosphate cement base c. Using cavity varnish d. Using sodium hypochlorite

c. Using cavity varnish

32. Three walls of a cavity preparation meet to form: a. Line axis b. plane c. margin d. point angle e. line angle

d. point angle

33. Cavity varnish is desirable under amalgam restoration because it a. Eliminates possibility of galvanic shock b. Improves marginal seal of restoraton c. completely seals all dentinal tubules d. effective thermal insulator/ e. All of the above

b. Improves marginal seal of restoraton

34. In class Il preparation, this wall joins the facial wall where retention groove is placed. a. Occlusal wall b. Axial wall c. facial/lingual wall d. pulpal wall

b. Axial wall

35. In the conventional class I composite preparation, retention is achieved by which of the following features? 1. occlusal convergence 2. occlusal bevel 3. bonding 4. retention grooves a. 2 and 4 b. 1 and 3 c. 1 and 4 d. 2 and 3

b. 1 and 3

36. Partial bevel in a cavity preparation means_ a. Beveling including entire enamel wall but not dentin b. Beveling including enamel and dentin walls c. Beveling part of enamel and part of dentin wall d. beveling part of enamel wall not exceeding 2/3 in dimension

d. beveling part of enamel wall not exceeding 2/3 in dimension

37. Degree of the bur during preparation of a class Ill cavity with lingual approach a. 45 degrees in relation to crown b. 90 degrees in relation to crown c. perpendicular to long axis of the tooth d. parallel to long axis of tooth

b. 90 degrees in relation to crown

38.Extension for prevention is directly related to: a. Removal of unsupported enamel on the proximal surface of class III cavity preparation b. Depth of the axial wall of class III cavity preparation c. Elimination of carious dentin beyond the average depth of the pulpal wall of class I cavity preparation d.Outline form of cavity preparation

a. Removal of unsupported enamel on the proximal surface of class III cavity preparation

39. The purpose of retention form in a cavity preparation is to resist displacement of the restoration by: a. Occlusal forces b. lateral forces c. lifting forces d. all of the choices

d. all of the choices

40. Use of water spray during tooth preparation have the following advantages: a. Dehydration of oral tissues b. Tooth restorative material and other debris are carried away C. Pulp is protected from heat d. clean view of cavity can be achieved e. bacterial contamination is controlled

C. Pulp is protected from heat

41. In deep cavity preparation with near pulp exposure primary liner is necessary, the best primary liner to put is calcium hydroxide because it soothes the pulp and arrest caries formation. a. 1st statement is true, 2d statement is false b. 1st statement is false, 2nd statement is true c. both statement are true d. both statement are false

c. both statement are true

42. If cavity preparation is contaminated after acid etching with saliva_ a. Air dry the cavity and proceed with the procedure b. polish with brush and pumice all over again c. rinse the saliva with water and spray d. wash the saliva, dry and etch again

d. wash the saliva, dry and etch again

43. Threaded pins are ised in amalgam restoration to provide: A. Resistance form b. retention form-ans c. reinforcement to amalgam d. occlusal stops

b. retention form-ans

44. When using acid etch technique to restore class V situation, exposed dentin should first be covered with - a. Cavity varnish b. phosphoric acid C. ZOE cement d. caoh liner

d. caoh liner

45.Affected dentin differs from infected dentin in that it has: a. Been invaded by microorganism b. Are precisely the same c. Not been invaded by microorganism d. a soft texture e. none of the choices

a. Been invaded by microorganism

46. The position of the gingival margins of a class Il amalgam preparation is dictated primarily by: a. Aesthetics b. location of the gingival margin C. the extent of the carious lesion d. thickness of the enamel

C. the extent of the carious lesion

47. The following includes the objective of cavity preparation, except, a. Adoption of the best restoration form b. Removal of the decayed dentin c. extension of the preparation to safe area d. giving advice to the patient on good oral hygiene

d. giving advice to the patient on good oral hygiene

48. the axial wall of class V cavity preparation is? a. Flat b. concave c. convex d. convex only incisocervically

c. convex

50. Gingival cavosurface margin is beveled in a class il amalgam restoration to: a. Get a lap joint on the cavosurface angle b. Remove the unsupported enamel rods c. get burnishable thickness of amalgam d. move the cavosurface away from the contact

b. Remove the unsupported enamel rods

51. Cavity liners are used to: a. help retain the restorative material b. protect the pulp c. add strength to the restorative material d. decrease the setting expansion of amalgam

b. protect the pulp

52. The primary purpose of using a dental liner under restoration is to: a. Increase strenght of the restoration b. Insulate the pulp c. improve adhesion of the restorative material d. enhance marginal adaptation

b. Insulate the pulp

53. The best primary liner for deep cavity preparation with near pulp exposure is: a. Calcium hydroxide because it is effective in promoting secondary dentin formation b. GIC because it releases flouride that can arrest caries formation e. ZOE because it soothes the pulp

a. Calcium hydroxide because it is effective in promoting secondary dentin formation

54. A base or liner which is contraindicated beneath filled or unfilled resins: a. Glass lonomer b. calcium hydroxide c. polycarboxylate cement d. zinc oxide eugenol

d. zinc oxide eugenol

55. The action of calcium hydroxide in promoting a calcified barrier to pulp that is accidentally exposed with an open a. Calcium ions form paste precipitates to form a calcified barrier b. Creating of an alkaline environment to form a calcified barrier c. Creation of a zone of coagulation necrosis d. Creation of necrotic tissue

b. Creating of an alkaline environment to form a calcified barrier

56. Why is it important to restore proper proximal contact when restoring teeth? a. To minimize periodontal pocket formation b. To maintain the proper height of the interproximal papilla c. To maintain tha mesiodistal dimension of the tooth d. d. All of these are correct

d. All of these are correct

57. During cavity preparation pulp damage can be prevented by : a. Use of diamond burs with a brush stroke b. Use of local anesthetics c. Use of adequate air pressure d. Use of adequate water coolant

d. Use of adequate water coolant

58. In preparing class I cavity for dental amalgam, the dentist will diverge the mesial and distal walls toward the occlusal surface. The divergence serves to: a. Prevent undermining of the marginal ridges b. Provide convenience form c. Resist the forces of mastication d. Extend the preparation into areas more readily cleansed.

a. Prevent undermining of the marginal ridges

59. Varnish will not prevent discoloration of tooth by checking migration of ions into dentin, it is used to reduce microleakage and improve sealing ability of amalgam. a. 1st statement is correct, 2nd statement is incorrect b. 1st statement is incorrect, 2nd statement is correct c. both statement are correct d. both satement are incorrect

a. 1st statement is correct, 2nd statement is incorrect

60. Reasons for incorporating an enamel cavosurface bevel in preparation for bonded, direct, composite restorations: 1. Provides more surface area foe bonding 2. Allows for more preferred end on etching of the enamel rods 3. Increase retention 4. Reduce leakage 5. Provide greater potential for straightening the remaining tooth structure a. 1,2,3,4 b. 2,3,4,5 c. 1,2,3,5, d. 1,2,4,5 e. 1,2,3,4,5

e. 1,2,3,4,5

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