335913429 Restorative Dentistry Board Questions docx PDF

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RESTORATIVE DENTISTRY BOARD QUESTIONS 1RESTORATIVE DENTISTRY BOARD QUESTIONS Streptococcus mutans is considered to be a principal etiologic agent of caries because it produces organic acids and it: a) Forms a gelatinous matrix b) Derives energy from constituents c) Metabolizes substrate from saliva ...

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RESTORATIVE DENTISTRY BOARD QUESTIONS 1 RESTORATIVE DENTISTRY BOARD QUESTIONS 1. Streptococcus mutans is considered to be a principal etiologic agent of caries because it produces organic acids and it: a) Forms a gelatinous matrix b) Derives energy from constituents c) Metabolizes substrate from saliva d) Lives symbiotically with Lactobacillus acidophilus 2. a) b) c) d)

The microorganism most commonly associated with root surface caries is: Actinomycesviscosus Streptococcus mutans Streptococcus salivarius Lactobacillus acidophilus

3. a) b) c) d) e)

What is Enameloplasty? Extension of outline form Adding synthetic enamel to surface The procedure of reshaping grooves with rotary cutting instruments Removal of the entire thickness of enamel None of the above

4. a) b) c) d)

Sensitivity can be felt in enamel due to the presence of: Enamel lamellae Enamel tufts Enamel spindles Enamel sheath

5. a) b) c) d)

What class/ classes ofcavities is/are found on the all teeth ( anterior or posterior) Class I, II Class III, IV Class I, V, VI Class II, IV, V

6. All enamels must consists of : a) A cluster of enamel rods protruding from cavity b) Full length enamel rods or full-length rods supported by shorter rods terminating on sound dentin c) Cavity outline placed on rough curve d) Cavity outline placed on irregular lines

e) None of the above 7. a) b) c) d) e)

Affected dentin differs from infected dentin in that it has: Been invaded by microorganisms Are precisely the same Not been invaded by microorganisms A soft texture None of the above

8. Which of the following is the most effective way to reduce injury to the pulp during a restorative procedure? a) Prepare dentin with slow-speed burs. b) Use anesthetics without vasoconstrictors c) Minimize dehydration of the dentinal surface d) Keep the dentinal surface clean by frequent irrigation 9. a) b) c) d)

Discoloration of the tooth under big amalgam restoration can be prevented by: Using cavity varnish Using correct alloy: mercury ratio Using zinc phosphate cement base Washing the prepared cavity with NaOCl3

10.Gingival cavosurface margin is beveled in a class II cavity for 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 11.The position of the gingival margin of a class II amalgam preparation is dictated primarily by: a) Aesthetics b) The location of the gingival margin c) The extent of carious lesion d) The thickness of the enamel

a) b) c) d) e)

12. A marginal ridge wall in a prepared cavity for amalgam is: At right angles to the pulpal floor Parallel to the long axis of the tooth At an obtuse angle to the pulpal floor Determined by the extent of the fissures of the central groove None of the above

13.A newly condensed amalgam restoration seems to chip away when being carved. What is the likely cause of this problem?

a) b) c) d) e)

A low-copper alloy was used Moisture contamination occurred The alloy was incompletely wetted with mercury The amalgam was not condensed with the recommended pressure The amalgam was condensed after its working time elapsed

14. After the dentist has completed an etching procedure on a Class III composite preparation, the preparation becomes contaminated with saliva. In response, the dentist should do which of the following? a) Blow away the saliva with air, then proceed b) Rinse away the saliva with water, dry the preparation, then proceed c) Wipe away the saliva with a cotton pellet, rinse the preparation with water, dry it with air, then proceed d) Rinse away the saliva with water, dry the preparation with air, then repeat the etching procedure 15.Resistance forms is the ability to withstand masticatory stress and this is established by: a) Bulk of the restorative material b) Strength of the restorative materials c) Compressiveness d) Compactness 16.Proper pulpal depth of all restoration may be considered as: a) Convenience form b) Outline form c) Retention form d) Resistance form e) None of the above 17.Hand cutting instrument are composed of: a) Handle and blade b) Handle, shank and blade c) Shank and blade d) Handle and shank e) None of the above 18.Luting cements may get rapidly dissolved due to: a) Occlusal forces b) Microorganisms c) Marginal leakage d) Casting technique 19.Guard is use for: a) Mechanical devices

b) c) d) e)

Unnecessary with hand cutting instruments Useful only for dental students Finger positions of hands opposite that using the instrument None of the above

20.The following are represent the fundamental grasps for hand instruments: a) Pen grasp b) Inverted pen grasp c) Modified palm and thumb grasp d) Palm and thumb grasp e) All of the above 21.Capping of cusp/s should be considered for an onlay restoration when: a) Occlusal outline is extended up to the cusp slopes more than ¼ the distance from the primary grooves to the cusp tip b) Occlusal outline is extended up to the cusp slopes more than 2/3 the distance from the primary grooves to the cusp tip c) Occlusal outline is extended up to the cusp slopes more than ½ the distance from the primary grooves to the cusp tip d) Occlusal outline is extended up to the cusp slopes more than 1/3 the distance from the primary grooves to the cusp tip 22.Finish of the enamel margin at the gingival cavosurface on a cavity prepared for amalgam a) Not indicated because of the poor tensile strength of amalgam b) Accomplished by creating a steep cavosurface bevel c) Not requires since no stress is placed on this region of the restoration d) Accomplished by removing unsupported enamel rods and prisms 23.The axial wall of the class V cavity preparation is: a) Flat b) Concave c) Convex d) Convex only incisocervically 24.In direct veneering, labial surface preparation removes approx. 0.5 to 1 mm enamel and margins are prepared slightly incisal to free gingival crest with a finish line as: a) Shoulder with bevel b) Knife edge c) Chamfer finish line d) Shoulder 25.The restorative material that is most anticariogenic is: a) Composite resin b) Dental amalgam

c) Calcium hydroxide d) Glass ionomer cement

26.A base or liner which is contraindicated beneath filled or unfilled resins is: a) Glass ionomer b) Calcium hydroxide c) Polycarboxylate cement d) Zinc oxide eugenol 27.A notable difference in class II cavity preparation for composite and for amalgam is in: a) Proximal box b) Pulpal wall c) Axial wall depth d) None of the above 28.Silicate Cements is: a) Do produce an irritating effect on pulp b) Do not produce an irritating effect on pulp c) Are harmless d) Are innocuous e) None of the above

29.Which of the listed principles of the cavity preparation is of least importance for the reception of a silicate? a) Extension for prevention b) Resistance form c) Finishing of enamel d) Debridement 30.ZINC OXIDE AND EUGENOL SHOULD NOT BE USED UNDER: a) Porcelain filling material b) A resin filling material c) Gold inlays d) Amalgam restorations e) None of the above

resto board exam 2 11. a. b. c. d. d.

Which class III lesions listed below should not be filled with composite resin? mesial-lingual of canines distal-lingual of laterals mesial-lingual of centrals distal-lingual of canines distal-lingual of canines

12. a. b. c. d. c.

High copper dental amalgam alloys involve what ranges of copper in their composition 1 to 4% 5 to 8% 10 to 30% 50 to 60% 10 to 30%

13. a. b.

Tarnish means a change in color texture

a.

color

14.

The second number on those instruments having a three-number formula indicates the

a. b. c. d. b.

angle of the cutting edge in degrees length of the blade in millimeters length of the blade in tenths of a width of the blade in millimeters length of the blade in millimeters

15. a. b. c. d. c.

How many line angles does a class 2 have? 9 10 11 12 11

16. a. b. c. d. a.

The typical divergence of all ways of a cast metal restoration Inlay taper Bevelling Reverse curve Butt joint Inlay taper

centigrade millimeter

17. That form in class III cavities which helps to insure the proper line of force for condensation of direct filling gold is:

a. b. c. d. d.

outline form resistance form retention form convenience form convenience form

18. Finish of the enamel margin at the gingival cavosurface on a cavity prepared for amalgam a. not indicated because of the poor tensile strength of amalgam b. accomplished by creating a steep cavosurface bevel c. not requires since no stress is placed on this region of the restoration d. accomplished by removing unsupported enamel rods and prisms d. accomplished by removing unsupported enamel rods and prisms 19. Stainless steel pins are principally used in conjunction with amalgam restorations to enhance: a. retention b. strength c. resistance form d. all of the above a. retention 20. a. b. c. d. d.

Gold inlays have improved retention when there is a large cement film thickness the opposing walls diverge towards the there is less surface area involved in the the axial length in the cavity preparation the axial length in the cavity preparation

21. a. b. c. d. b.

Retention form is created in a class V cavity prepared for direct filling gold at the mesial and distal axial line angles the occlusal and gingival axial line angles the four point angles of the cavity circumferentially around all walls the occlusal and gingival axial line angles

22. a. b. c. d. b.

Retention form for composite resin restorations is achieved by a chemical bond with the tooth adhesion to the enamel and dentin mechanical undercuts all of the above adhesion to the enamel and dentin

occlusal preparation is increased is increased

23. a. b. c. d. c.

Retention form for composite resin restorations in class III preparations is achieved by sharp, well-defined line angles parallel walls rounded undercuts at the incisal and gingival point angles sharp, cute point angles at the incisal, labioaxiogingival, and linguoaxiogingival rounded undercuts at the incisal and gingival point angles

24.

In class V preparations to receive composite resin, the extension is determined by the

a. b. c. d. b.

position of the gingival crest extent of caries involvement contour of the tooth caries susceptibility of the patient extent of caries involvement

25. A commonly used acid solution for etching enamel in conjunction with composite resin restorations is a. 50% phosphoric acid b. 50% sulfuric acid c. 75% phosphoric acid d. 50% silicophosphoric acid a. 50% phosphoric acid 26. a. b. c. d. c.

Most amalgam alloys are comprised approximately of what percentage of silver 50% 60% 70% 80% 70%

27. Delayed expansion of amalgam restorations is associated with which two factors listed below a. insufficient trituration and condensation b. high residual mercury c. the contamination of the amalgam by moisture during trituration and condensation d. the failure to use cavity varnish a. insufficient trituration and condensation c. the contamination of the amalgam by moisture during trituration and condensation 28.

Cavity liners are used to:

a. b. c.

help retain the restorative material protect the pulp add strength to the restorative material

d. b.

decrease the setting expansion of protect the pulp

amalgam

29. a. b. c. d. c.

When mixing zinc phosphate cement, a cool glass slab is used to: accelerate the setting time create more free zinc oxide in the set cement increase the powder-liquid ratio increase expansion of the set cement increase the powder-liquid ratio

30. All of the following statements are true regarding glass ionomer restorations except a. GI is often the ideal material of choice for restoring root surface caries in patients with high caries activity b. the best surface finish for a GI restoration is that obtained against a surface matrix c. GI adheres to mineralized tooth tissue d. GI are somewhat esthetic and polish much better than composite d. GI are somewhat esthetic and polish much better than composite 31. a. b. c. d. b.

Zone II of carious dentin is also referred to as: normal dentin sub-transparent dentin transparent dentin turbid dentin sub-transparent dentin

32. a. b. c. d. b.

Pit and fissure caries does not spread laterally to a great extent until the: pulp is reached dentinoenamel junction is reached cementoenamel junction is reached marginal ridge is reached dentinoenamel junction is reached

33. except: a. b. c. d. b.

When comparing the physical properties of filled resins, all of the following are true filled resins are harder unfilled resins have a lower coefficient of thermal expansion filled resins have a higher compressive strength unfilled resins have a lower modulus of elasticity unfilled resins have a lower coefficient of thermal expansion

34. a. b. c. d.

Small size filler in composite resins results in a composite resin that has: better finishing characteristics but a lesser resistance to wear a greater resistance to wear but doesn’t finish well better finishing characteristics and a greater resistance to wear a lesser resistance and also doesn’t finish well

c.

better finishing characteristics and a

greater resistance to wear

35. a. b. c. d. c.

A properly acid-etched enamel surface appears somewhat yellow in color identical to unetched enamel dull white and chalky slightly gray with a shine dull white and chalky

36. Which component of a dentin bonding system below functions primarily to remove the smear layer of dentin a. etchant b. conditioner c. primer d. adhesive b. conditioner 37. The outline form of a class V composite preparation resembles that of a class V amalgam preparation except for what important feature listed below? a. no retentive grooves are necessary b. the internal line angles are much more rounded c. pulp protection is not required d. none of the above b. the internal line angles are much more rounded 38. The matrix for a class II amalgam has occlusal extensions to: a. Prevents escape of amalgam during condensation b. Serve as a guide to determine the completed restoration c. Allow overfilling of the material d. Produce a smoother amalgam restoration c. Allow overfilling of the material 39. a. b. c. d. d.

Solubility in oral fluids is one of the basic disadvantages of: Compomers Glass ionomer filling materials Composite resins Silicate cements Silicate cements

40. Which of the following instruments is designed to most effectively plane the enamel of the facial and lingual walls of a class II amalgam preparation a. a gingival margin trimmer b. a straight chisel c. an enamel hatchet d. a spoon excavator c. an enamel hatchet

41.

Class II lesions usually start as an area of

a. b. c. d. c.

discoloration at the marginal ridge undermining opacity softness opacity

42. a. b. c. d. c.

The dentin primer creates microporosities in the dentin surface removes the smear layer and smear plugs enhances bonding of the composite and dentin better esthetics enhances bonding of the composite and dentin

43. The use of a eugenol-containing material under resin will a. inhibit polymerization of the resin b. hasten polymerization of the resin c. not affect the polymerization of the resin d. enhance the polymerization of the resin a. inhibit polymerization of the resin 44. a. b. c. d. b.

As amalgam ages, the degree of microleakage: increases decreases remains the same does not occur decreases

45. a. b. c. d. b.

Alloy-Hg ratio by weight 1:1 5:7 1:3 7:5 5:7

46. a. b. c. d. b.

Deciduous teeth are etched longer than the permanent teeth because enamel rods are regularly arranged enamel rods are irregularly arranged enamel of primary teeth are harder enamel rods of primary teeth are denser enamel rods are irregularly arranged

47. Are reasons why the pulpal/axial walls of cavity preparation should be at the correct level in dentin, except

a. b. c. d. a.

to avoid seating the restoration on the DEJ to take advantage of elasticity of dentin to allow enough bulk of the material to avoid too much loss of enamel tissues to avoid seating the restoration on the DEJ

48. The instrument grasp wherein the instrument is held by the palm and directed by the palm and fingers is a. modified palm and thumb grasp b. modified pen grasp c. pen grasp d. palm grasp a. modified palm and thumb grasp 49. a. b. c. d. b.

Creep of amalgam means movement of amalgam away from the cavity margins movement of the amalgam towards the cavity margins movement of amalgam away from the cavity movement of the amalgam towards the cavity movement of the amalgam towards the cavity margins

50. a. b. c. d. a.

Luting GIC type I type II type III type IV type I

Restorative Dentistry Board Questions 3 Rest or at i veDent i st ryBoar dQues t i ons

1. Whyi samat r i xf oraCl assI Ident alamal g am r es t or at i onext endedoccl usal l yt o t hecavi t ypr epar at i on? A. I tser vesasagui det ode t er mi net hecompl et edr est or at i on. B. I tal l owsf orover fil l i ngt heamal gam. C. I tpr event sescapeoft heamal gam dur i ngcondensat i on

2. Ther educt i onofwhi choft hef ol l owi ngr epr esent st hemostsi gni ficant advant ageofaci det c ht echni que? A. Mi cr ol eakage B. Pul pali r r i t at i on C. Set t i ngshr i nkageoft hemat r i x D. Coeffici entoft her malexpansi on

3. Af t ert hedent i sthascompl et edanet chi ngpr ocedur eonaCl assI I Icomposi t e pr epar at i on,t hepr epar at i onbecomescont ami nat edwi t hsal i va.I nr esponse, t hedent i stshoul ddowhi choft hef ol l owi ng? A. Bl ow awayt hesal i vawi t hai r ,t henpr oceed. B. Ri nseawayt hesal i vawi t hwat er ,dr yt hepr epar at i on,t henpr oceed C. Wi peawayt hesal i vawi t hacot t onpel l et ,r i nset hepr epar at i onwi t h wat er ,dr yi twi t hai r ,t henpr oceed D. Ri nseawayt hesal i vawi t hwat er ,dr yt hepr epar at i onwi t hai r ,t hen r epeatt heet chi ngpr ocedur e.

4. St r ept ococcusmur t ansi sconsi der edt obeapr i nci palet i ol ogi cagentofcar i es becausei tpr oducesor gani caci dsandi t : A. f or msagel at i nousmat ri x B. der i vesener gyf r om cons t i t uent s Lact obaci l l usaci dophi l us

C.met abol i z essubst r at ef r om sal i va D.l i vessymbi ot i cal l ywi t h

5. I naCl assI I Icomposi t epr epar at i on,r et ent i onshoul dbepl aced: A. i nt heaxi alwal l C.ent i r el yi ndent i n

B. att heDEJ t heaxi alwal l

D.att heexpenseoff aci alandl i ngualwal l s,butnot

6. Theposi t i onofmesi alanddi st alcavi t ymar gi nsi naFer r i erCl assVdi r ectfil l i ng gol dr es t or at i onshoul dbe: A. i naneasi l ycl eansabl ear ea mar gi ns

D.per pendi cul art ot hegi ngi val

B. par al l elt ot hel ongaxi soft het oot h E.j ustpastt heext entoft hecar i ous l esi ons C. att her espect i vel i neangl esoft het oot h

7. Reasons f or i ncor por at i ng an enamelcav osur f ace bev eli n pr epar at i ons f or bonded,di r ect ,composi t er est or at i ons: 1,pr ovi desmor esur f acear eaf orbondi ng 2,al l owsf ort hemor epr ef er r edendone t chi ngoft heenamelr ods. 3,i ncr easer e t ent i on 4,r educel eakage 5,pr ovi d...