Relevant from old exams

9. The hardness of a gold alloy isa. greater for alloys of higher gold contentb. related to the elastic limitc. greater for alloys having large percentage elongationsd. decreased by bench cooling the mold after casting

10. Platinum and palladium are added to dental gold alloys in order toa. increase malleability b. increase strengthc. decrease strengthd. decrease melting temperature

13. The primary purpose of a flux during soldering is to a. enhance oxidation in the solder jointb. dissipate the heat at the solder jointc. form carbides for dispersion hardening in the solder jointd. dissolve surface oxides and act as a barrier to oxidation in the solder join

14. For FPD’s consisting of regular gold units with or without metal ceramic units, a solder must be used

a. low-fusingb. high-fusing

15. After soldering, the invested FPD should bea. quenched immediately in order for annealing to occurb. allowed to cool to room temperature to obtain maximum recrystalization and grain

growthc. bench cooled for 5 minutes in order to respond to an ordering heat treatment and then

quenched

16. To be biologically and mechanically acceptable a soldered joint of a FPD should be so formed that it

a. extends to the buccal margin of a partial veneer retainerb. fills the entire interproximal spacec. is thin occlusogingivally and wide buccolinguallyd. is circular or elliptical in form and occupies the region of the contact area

17. Theoretically the distance between parts of a FPD to be soldered should be related to which of the following

1. thermal expansion of the investment during heating2. thermal expansion of the parts3. hygroscopic expansion of the investment4. shrinkage of the solder during solidification

a. 1 only

b. 1, 4c. 1, 2, 4d. 3, 4

18. When soldering the material used to confine the flow of molten solder isa. a fluxb. an antifluxc. an oxidizing agentd. a sulfide

19. Which would provide a greater increase in the strength of a rigid connector?a. Double the faciolingual widthb. Double the occlusogingival width

20. When sectioning a FPD for a solder relation, the solder joint gap should be made _______ wide for adequate strength and minimal distortion.

a. 0.005 mmb. 0.25 mmc. 1.0 mmd. 2.5 mm

21. When a non-rigid connector is used in a FPD, the path of insertion of the key and the keyway should be parallel to

a. the path of insertion of the retainer carrying the keywayb. the path of insertion of the retainer not involved with the keywayc. the paths of insertion of both retainersd. none of the above

22. In order to get the solder to flow between the castings to be joined the surfaces should bea. flat and parallelb. highly polished with rougec. smooth, with a satin finishd. a and be. a and c

23. Dental soldering of two metal surfaces in contingent upona. melting the metal componentsb. wetting the joined surfaces by the melted solderc. fusion of the parent metalsd. All of the above

24. The dimension of the occlusal table of a pontic is determined bya. narrowing the table by 20% of the original to decrease occlusal forcesb. the vertical dimension of occlusionc. position of the opposing occlusal centric holding contact areasd. width and crestal position of the edentulous ridge

25. In a posterior FPD, a pontic should be in

a. occlusal contact in RCP, working and non-working movementsb. contact in centric occlusion, may or may not be in contact in working but no contact in

non-working movementsc. infraocclusion to reduce the icad placed on the restorationd. supraocclusion to ensure good function

26. A pontic becomes enveloped with inflamed gingival tissue several weeks after cementation of a FPD. Bleeding occurs while brushing. This condition could be caused by

1. inadequate oral hygiene2. insufficient gingival embrasures3. tissue displacement by the pontic4. lack of sufficient contact with the edentulous ridge5. irritation caused by not removing excess cement

a. 1, 2, 3, 5b. 1, 2, 4, 5c. 2, 3, 4d. 3, 4, 5

27. To maintain healthy tissue beneath a pontic, it is desirable toa. scrape the ridge area on the cast and use gold or porcelain for the ridge contactb. have passive contact with the ridge tissue and minimal tissue coverage consistent with

estheticsc. have slight blanching of the ridge tissue when the restoration is placed in the mouth

28. What type of pontic is indicated in an esthetic area?a. Saddle (ridge lap)b. Modified ridge lapc. Sanitaryd. Bullet

29. Because of the tissue contact area of the pontic, which of the following designs is contraindicated?

a. saddle (ridge lap)b. modified ridge lapc. sanitary bullet

30. The use of a non-rigid connector in a FPD is indicated whena. constructing a mandibular FPD onlyb. two or three missing teeth are to be replacedc. abutments cannot be prepared to draw together without excessive reductiond. forces in different directions would cause a pier abutment to act as a fulcrume. both c and d are correct

32. A thin application of cavity varnish over the cut surface of a prepared tooth just before cementation of a crown or FPD with zinc phosphate cement will function to

a. increase retention

b. facilitate seating of the restorationc. insulate the tooth against thermal stimulid. reduce the possibility of irritation of the pulp due to the acidity of the cement

ANSWERS:1. A2. B3. A4. D5. D6. D7. D8. B9. B10. B11. B12. D13. D14. A15. C16. D17. A18. B19. B20. B21. B22. E23. B24. C25. B26. A27. B28. B29. A30. D31. ?32. D33. B34. B35. A

1. What is the correct size, shape and position of a soldering joint?

12. Platinum and palladium are added to dental gold alloys in order toe. increase malleability f. increase strengthg. decrease strengthh. decrease melting temperature

13. A type III gold alloy casting which is quenched from a temperature of 1300 F exhibitsa. an intermetallic compound and is in the hardened conditionb. an intermetallic compound and is in the softened conditionc. an eutectic mixture and is in the hardened conditiond. a solid solution and is in the softened condition

14. The primary purpose of a flux during soldering is to e. enhance oxidation in the solder jointf. dissipate the heat at the solder jointg. form carbides for dispersion hardening in the solder jointh. dissolve surface oxides and act as a barrier to oxidation in the solder join

15. Which would provide a greater increase in the strength of a rigid connector?c. Double the faciolingual widthd. Double the occlusogingival width

16. Dental soldering of two metal surfaces in contingent upone. melting the metal componentsf. wetting and bonding of parent material with filler metalg. fusion (melting) of the parent metalh. b and ci. All of the above

17. The dimension of the occlusal table of a pontic is determined bye. narrowing the table by 20% of the original to decrease occlusal forcesf. the vertical dimension of occlusiong. position of the opposing occlusal centric holding contact areash. width and crestal position of the edentulous ridge

18. In a posterior FPD, a pontic should be ine. occlusal contact in RCP, working and non-working movementsf. contact in centric occlusion, may or may not be in contact in working but no contact in

non-working movementsg. infraocclusion to reduce the icad placed on the restorationh. supraocclusion to ensure good function

19. Because of the tissue contact area of the pontic, which of the following designs is contraindicated?

d. saddle (ridge lap)e. modified ridge lap

f. sanitary g. bullet

20. A thin application of cavity varnish over the cut surface of a prepared tooth just before cementation of a crown or FPD with zinc phosphate cement will function to

e. increase retentionf. facilitate seating of the restorationg. insulate the tooth against thermal stimulih. reduce the possibility of irritation of the pulp due to the acidity of the cement

23. On seating your FPD you find it rocks M-D (doesn’t seat fully), there is NO internal interferance and is not impinging on tissue. What do you do?

a. keep grinding the internal surface in hopes it will eventually seatb. section at a solder joint and evaluate the individual fitsc. make a duralay solder joint relation and evaluate the fitd. only b and ce. all of the above

8. Which of the following teeth is the least desirable to plan on using as an abutment for a FPD? (Which has the most unsolvable problem?)A. Tooth with pulpal involvementB. Tooth with minimal coronal structureC. Tooth rotated and tipped out of line, 15°D. Tooth with a conical root and a poor crown:root ratio

9. Which of the following situations are NOT indicated for use of a partial veneer crown?A. To restore a tooth with one or more intact axial surfaces with half or more of the coronal tooth structure remaining.B. For use as a retainer when superior retention is needed (long span)C. When an abutment tooth is in good alignment, has a long clinical crown and no mobility.D. When the situation does not require high esthetic demands.

Thrown out : Under which circumstances is a removable partial denture indicated?A. In the absence of a distal abutment and vertical support from the edentulous ridge is needed.B. To ensure stability with a long edentulous space.C. When there is considerable bone loss in the visible anterior region.D. All of the aboveE. None of the above

10. Which of the following statements concerning the periodontal support of prospective abutment teeth is not true?A. “Ante’s Law” defines the root surface area of abutments needed to accept the additional load of the pontics.B. The root surface area of the teeth to be replaced by pontics can generally be surpassed by that of the abutments.

C. Any fixed prosthesis replacing more than 2 teeth should be considered to be risky.D. Periodontally involved teeth have a lessened capacity to serve as abutments.

11. Which of the following is the most appropriate retainer design for a mandibular 1st molar abutment of a 4-unit FPD which has a short clinical crown?A. ¾ crownB. MOD onlayC. Full crownD. Full crown with additional grooves

12. When should a non-rigid connector be used in FPD design?

A. When a pier abutment is involved in the prosthesisB. When there is a discrepancy in the path of insertion of the abutment preparationsC. When the abutment teeth are mobileD. All of the aboveE. A and B only

13. When designing a FPD replacing the maxillary 2nd premolar and 1st molar, with the abutments being in normal alignment, the connectors of choice would beA. A non-rigid connector on the premolar and a rigid connector on the molar.B. A rigid connector on the premolar and a non-rigid connector on the molar.C. Non-rigid connectors on the premolar and molar.D. Rigid connectors on both the premolar and molar.

14. The following are reasons that we use a chamfer for gold margins EXCEPT:A. To give a clear and definite finish line.B. To allow adequate gold for strength with the ability to provide a physiologic contour.C. It is the most conservative of tooth structure of all margin designs.D. It produces the least stress in the cement film interface.E. It provides for an acute angle of gold for marginal adaptation.

15. When planning for a FPD which will use #30 as an abutment and it is tilted mesially and lingually, the optimum treatment would beA. A non-rigid connector on the mesial surface.B. A proximal ½ crown.C. A telescope crown and copingD. Orthodontic repositioning (uprighting)

16. When utilizing a non-rigid connector when there is a pier abutment, the KEYWAY should be placedA. in the mesial of the posterior abutmentB. in the distal of the pier abutmentC. in the mesial of the pier abutmentD. in the distal of the anterior abutment

17. A maxillary lateral incisor will be replaced using a cantilever FPD. Which of the following is NOT appropriate?

A. Canine should be used as an abutment.B. The abutment should have a long root with excellent bone support.C. The clinical crown should be long and prepared with maximum retention and resistance form.D. The central incisor should be used as the abutment.E. There should be no occlusion on the pontic in centric or excursive contact.

18. Assuming all other factors in a FPD are equal, an increase in the span length and/or decrease in the occlusogingival thickness will have what effect of the FPD restoration?A. Increased bending or deflectionB. Decreased rigidityC. Dislodging forces placed on the abutment teeth will be greaterD. All of the aboveE. None of the above

19. Common causes of abutment failures include:A. Loosening of the teeth as a result of periodontal overstress and torqueB. Loosening of castings and development of dental cariesC. Failure to eliminate occlusal disharmonies coupled with periodontal diseaseD. Pulpal damage and subsequent periapical pathosis caused by improper operating procedures.E. All of the above

20. If a posterior tooth is prepared with a n optimum convergence angle without of functional cusp bevel, what problem(s) could be encountered in the restoration in the area of the functional cusp?A. Thin area of metalB. Performation of the restoration with wearC. Overcontoured cusps and occlusal prematurityD. All of the aboveE. None of the above

21. How long should you wait following a pulp exposure and pulp capping of an abutment tooth to proceed with FPD fabrication?A. 1 weekB. 4-6 weeksC. 4-6 monthD. Endodontic therapy should be performed.

22. The following are criteria required for favorable prognosis of a cantilever FPD replacing a mandibular 1st molar EXCEPT:A. Pontic size decreased to that of a premolar.B. Light occlusion in centric, no contact in lateral excursion.C. Decrease the occlusogingival thickness of pontic/connectorD. Increase retention of the abutments with groovesE. Use both premolars as abutments

23. A mesially tipped molar is to be used as an abutment for a FPD. How should the occlusal surface be prepared for proper clearance and conservation of tooth structure?A. Make occlusal depth grooves and remove and even 1.0 - 1.5 mm of tooth structure.B. Reduce the occlusal surface so that there is an even 1.0 – 1.5 mm of clearance regardless of the amount removed from the occlusal surface.

27. In which situation might a prospective abutment with a less than average crown:root ratio be considered adequate?A. When the opposing dentition is a fixed partial dentureB. When the abutment is mobileC. When the preparation has long wallsD. When the opposing dentition is a removable partial or complete denture

29. What is generally considered to be the maximum amount of tipping in abutment teeth allowable in order for them to be prepared with a common path of insertion?

30. When designing a FPD replacing the four maxillary incisors, with a significant arch curve, which teeth should be used as abutments?

31. How could the design of a FPD be modified to accommodate an abutment with an inadequate crown-root ratio?

33. How much clearance should there be between the functional cusps of a posterior FGC preparation and its opposing tooth?

34. How is resistance to rotational forces gained in the full or partial veneer crown preparation?Answers:

1. B2. B3. C4. E5. B6. C7. A8. D9. B10. A11. D12. E13. D14. C15. D16. B17. D18. D19. E20. D

21. D22. C23. B24.25. D26. E27. D28.29. 25-30 convergence30. Canines and

premolars31. Use a strong 2

abutment32. Beveling 45-60,

and Increased # of grooves

33. 1.5 mm34. Seating groove35. Finish line should

not be placed

closer than 2.0 mm to the crestal bone

Bonus: Periodontal surgery (crown lengthening)

Forcible, orthodontic eruption

Extraction & replacement with an implant or FPD

1. For best esthetics. the interproximal contact in anterior PFM crowns should be

a. in metal.b. in porcelain.c. on the porcelain/metal finish line.

2. To allow adequate space to develop color in a PFM crown, yet avoid overcontour,mid-facial reduction should be about ____mm and incisal edge or occlusal surface reduction should be about __mm.

a. 1.0. 1.5b. 1.5, 2.0 C. 2.0, 2.5 D. 1.0, 2.0

3. Over-reduction (overshortening) of which wall on an anterior PFM crown preparation will most quickly destroy the resistance form?

A. Facial wallB. lncisal edgeC. Mesial or distal wall

D. Lingual wall (cingulum area)

4. Zena et al demonstrated that all-ceramic margins made over hand instrument-planed shoulders fit significantly better than margins made over finish lines cut solely with rotary instruments.

A. TrueB. False

5. The following are advantages of placing occlusal contacts on unveneered metal surfaces of PFM crowns except:

A. Less tooth reduction is required.B. There will be less resultant wear on opposing natural teeth.C. The location of occlusal contacts can be more accurately controlled in metal.D. The metal can be more easily adjusted and polished chairside than porcelain.E. Esthetics

6. Which of the following would occur if a biplanar (two planes) facial reduction is not used on the facial surface of a PFM crown preparation?

A. The incisal half of the crown may be overcontoured. B. A bright spot or headlight" may result in the incisal half.C. The facial surface may be overtapered and too close to the pulp.D. All of the aboveE. None of the above

7. All-ceramic crowns should be avoided on teeth with which type of occlusion?

A. Edge-to-edge occlusionB. Occlusion in the cervical 1/5 of the toothC. Any posterior occlusionD- A and B onlyE- All of the above

8. Which type of margin should be used with an all-ceramic crown?

A. Radial shoulderB. Shoulder with a bevelC. BevelD. Chamfer

9. Which of the following is a good design component for a PFM metal coping?

A. The contour of the veneering area should be evenly flowing and convex.B- The shape should support the porcelain in a layer of even thickness.C- The internal angles should be rounded. D- All of the above E- None of the above

10. The metal-ceramic finish line on an anterior PFM restoration should be

A- at the incisal edge. B- on the lingual surface. C- at the point of tooth contact in MIP.

11. The optimum thickness of a noble metal substructure in the ceramic veneering area of a PFM restoration is

A. 0. 1 - 0. 2 mmB. 0.3 - 0.5 mmC. 1.0 - 1.5 mm

12. The alloy for metal ceramic systems should

A. have a low proportional limit. B. have a low modulus of elasticity C. be rigid and need not be ductile. D. All of the above

E. None of the above

13. The principle cause for brittle fracture of porcelain is that

A. porcelain is noncrystalline.B- only secondary bonding exists between the atoms in porcelain.C- surface irregularities and microcracks act as sites for release of stresses. D- thermal and electrical conductivities are low

14. Porcelain is strongest when it is

A. air fired.B- under compression.C- than 2 mm thick and supported by a rigid substructureD- fired several times before completion. E- B and C only

15- The porcelain-metal junction at the external finish line of a PFM restoration should be

A- beveled.B- rounded.C- an obutse angle.D- 90 degrees.

16- The chemical bond that is formed between the metal and ceramic in a PFM restoration is due to

A- an affinity based on a mutual attraction of charged molecules-B- oxide formation during the heat treatment.

C- a difference of the coefficients of thermal expansion of the metal and ceramic.

17. When porcelain is fired too many times, it may undergo______becoming milky and difficult to glaze. A. devitrification B. frittingC. sinteringD. ceramming

18. Which of the following can cause an increase in the flexural strength and resistance of all ceramic crowns?

A. The use of a leucite or amumina/zirconia reinforced core. B. Etching the ceramic internal surface coupled with a resin bonded core.

C. The use of a shaded zinc phosphate cement.D. A or B onlyE. Any of the above

19. A ridge lap pontic should exhibit the following criteria except:

A. passive contact on the facial surface of the ridge.B. a convex surface over the residual ridge. C. appearance of emergence from the tissue. D. a concave surface over the residual ridge.

20. Of the following alloys, which is noted for possible occurrences of hypersensitivity reactions in patients?

A- Au-Pt-PdB- Cu-PdC- Au-Pd-Ag

D- Ni-Cr-Be

21. A ______-fusing solder must be used if FPD units are soldered after porcelain has been applied. Can the porcelain then be modified and the restoration refired after this soldering is done? (Yes or No)

A. Low YesB. High Yes LC. Low NoD. High /No

22. Which of the following is not an advantage of using an indirect technique when making a custom provisional ?

A. Improved accuracy of fitB. Protection from chemical and thermal irritationC. Additional time expenditure in making the impression and cast.D. Much of the work can be delegated to an auxillary. (time efficiency)

23. The interproximal embrasures of a provisional FPDshould be filled in completely into the gingival tissue so that it will have enough bulk to prevent fracture.

A. TrueB. False

24. If it is necessary to place a provisional FPD or several crowns for an extended period of time wher the functional load is very great, the most durable material to use would be

A. epimine resin.B. microfilled composite resin C. heat/pressure cured methyl methacrylate resinD. vinyl ethyl methacrylate resin

25. When a FPD is to be made in a posterior segment, single temporary crowns can be used because esthetics is not important there.

A. True B. False

ANSWERS

1. B2. B3. D4. A5. E6. D7. Thrown Out8. A9. D10. B11. B

12. C13. C14. E15. D16. B17. A18. D19. D20. D21. C22. C23. B24. C25. B

1. When selecting a margin design for a metal ceramic restoration, the design which will give you the best esthetic result is:

a. Beveled shoulderb. Porcelain butt margmc. Chamferd. Knife edge 2. The optimum depth for the facial reduction of a metal ceramic preparation is:

a. 1.0 mm b. 1.5 mm

c. 2.0 mm

d. 0.5mm

3.The amount of mid-lingual reduction for an anterior metal ceramic restoration withocclusion on porcelain is:

a. 1.0-1.5mmb. 2.0 mm

c. 0.7-l.O mmd. 0.3-0.7 nun

4. The optimum occlusal reduction for posterior teeth with metal ceramic restorations is:

a. 1.0 mmb. 1.3 mmC. 1.5 mmD. 2.Omm

5. For a porcelain jacket crown, when using a shoulder finish line on an anterior tooth, the amount of axial reduction that should extend completely around the tooth is:

A 1.OmmB 1.3mmC. 1.5 mmD. 2.0mm

6. Which finish line for a metal ceramic restoration lowers the stress concentration and it the best physiologic margin to use:

a. butt jointb. knife edgec. chamferd. beveled shoulder

7. A metal ceramic restoration preparation compared to a cast restoration requires:

a. increased retentionb. facial margin to be placed above the @al margin for estheticsc. increased reductiond. increase reduction and increased retention

8. The primary cause for repeated porcelain fractures in metal ceramic restorations is: a. inadequate reduction

b. inadequate designed framework c. inadequate faing of porcewn d. inadequate retention

9. The alloy for the PFM framework should have:

a. minimal creepb. high modulus of elasticityc. high yield strengthd. high sag resistancec. all of the above

10. The veneered area must be thick enough for 1.5-2.Omm of porcelain and 0.3mm of metal to provide:

a. rigidityb. stabilityC. resistanced. retention

11 A metal with a low sag factor will have ___deformation of a bridge span and will contain_________gold content.

a. more, mored. more, lessC. less, lessd. less, more

12. The best choice for an alloy used for a long span bridge with restricted occlusal space is:

a. Au-Pd-Agb. high Agc. Pd-Cud. Ni-Cr-Bec. Ni-Cr w/o Be

13. The best choice for an alloy used for a single crown or short span bridge isa. Pd-Cub. Pd-Agc. Ni-Cr-Bed. Au-Pde. all of the above

14. All of the following are advantages of the metal ceramic restoration t:

a. the preparation is less demanding than a partial veneer crownb. has good resistance and retentative propertiesc. requires increased reduction to provide sufficient space for restorative materialsd. provides the strength of metal with the esthetics of porcelain

15. The occlusion of a tooth should contact the metal ceramic restoration on

a. metalb. metal/ porcelain finish linec. porcelaind. either metal or porcelain but not on the finish line

16. The metal supporting porcelain should be at least __thick and an optimum thickness of ____.a. 0.3mm, 0.5mmb. 0.5mm, 0.7mmc. 0.7mm, l.Ommd. l.Omm, 1.5mm

17. The porcelain metal junction of a metal ceramic restoration should be 90 degress

a. trueb. false

18. How does porcelain chemically bond to the metal in the construction of a metal framework?

a. wettingb. oxidesc. interlockingd. all of the above

19. In the metal ceramic technique, heating the substructure in the furnace prior to the application of the the opaque layer is neccessary to

a. eliminate the oxidation of the metalb. release hydrogen gasc. oxidize trace elements in the metald. b and ce. a and b

20. When casting the metal substructure for a metal ceramic restoration you should use:

1. gas-oxygen torch2. gas-air torch3.gypsum investment4.phosphate investment

a. 1 and 3b. 1 and 4 c. 2 and 3

d. 2 and 4

21. Contamination by handling the metal coping is most likely to occur between which two steps which will result in fracture:a. heat treatment and the first opaque layer bakeb. the first and @ second opaque layer bakec. the last opaque bake and polishingd. polishing and cementation

22. When a metal ceramic restoration, the area of porcelain most suseptable to fracture if there is not a passive tilt is the:a. lingual gingivalb. Facial gingivalc. mesial gingivald. distal gingival

23. Dental ceramics are strongest in response to which force(s):

a. tensionb. compression c. sheard. torque e. a and b

24. The tooth that is most suitable for occlusion on the occlusal table is:

a. second molarb. mandibular first molarc. maxillary first premolard. mandibular first premolar

25. In designing a pontic for a metal ceramic fixed partial denture, what material should be used for the tissue surface of the pontic

a. porcelainb. metalc.either one, it doesn't really matter

26. When selecting the pontic design for a metal ceramic fixed partial denture, the best choice when taking esthetics into consideration is the:

a. bulletb. ridge lapc. modified ridge lapd. saddle

27. The advantages of having occlusal contact on metal vs. having occlusal contact on porcelain are:

1. metal is easier to adjust occlusion with2. porcelvn will wear tooth structure faster3. metal will wear tooth structure faster4. porcelain is easier to adjust occlusion with5. metal requires less occlusal reduction6. porcelain requires less occlusal reduction

a. 2, 4, 6b. 2,4,5c. 1, 2,5d. 1,3,6e. 1,3,5

28. The best selection of a pontic design in the posterior area when esthetics is of no concern is the:

a. bulletb. ridge lapc. modified ridge lapd. saddle

29. Devitrification is caused by

a. failure to heat the metal coping long enough before adding the porcelainb. heating the metal coping too long before adding the porcelainC. firing the porcelain too many timesd. not firing the porcelain long enough

30. What forms the glassy matrix and gives the porcelain translucency

a. feldspar b.quartz c. kaolind. none of the above

31. What is the main component of the refractory skeleton

a. feldsparb. quartzc. kaolind. all of the above

32. The addition Of what makes the porcelain opaque and are also coloring agents in porcelain

a. metal oxidesb. silicon dioxide c. a and bd. neither a nor b

33. Which of the finish lines listed below is not acceptable in esthetic situations when procelain will be used on the facial margin

a. beveled shoulderb. sloped shoulderc. chamferd. deep chamfer34. The optimum thickness for a noble metal coping is_____and the minimum thickness isa. 0.7-l.Omm, 0.2mmb. 0.4-0.5mm, 0.2mmc. 0.4-0.5mm, 0.3mmd. 0.7-I.Omm, 0.3mm

35. The minimum thickness for a base metal coping is

a. 0.2mmb. 0.3mm c. 0.4mmd. 0.5mm

36. The gingival margin to be used with a porcelain jacket crown is:

a. beveled shoulderb. shoulderc. chamferd. deep chamfer

37. When constructing a metal ceramic restoration, why is a thin and even porcelain veneer required for the best results

a. it produces an even colorb. it is easier to make this wayd. it provides optimum strenghth.e. a and c

38. When making a metal ceramic bridge, the surface characterization and addition of interproximal porcelain is done

a. after soderingb. before soldering(post sodering)

39. Of the following alloys, which of them can produce a hypersensitivity reaction?

a. Ni-Cr-Beb. Au-Pd c. Pd-Agd. Au-Pd-Ag.

40. The coefficient of thermal expansion of metal and porcelain should be closely matched to prevent

a. flow or creep or metalb. oxidation of metalC. shear stress fracture of porcelaind. porosity of porcelain

41. Base metals can produce excessive oxides, what effect would this have on the firing of the rest of the porcelain?

a. suseptabilty to fractureb. greying of porcelain colorc. weak bond between the metal and porcelaind. all of the above

42. What causes pulpal irritation when using polymethylmethacrylate resin when constructing a temporary restoration?

a. heat productionb. free monomerc. a and bd. none of the above

43. When placing a temporary for an extended period of time in an area of high occlusal load, the, best choice is

a. heat cured methylmethacrylate resinb. light cured methylmethacrylate resinc. heat cured polymethylmethacrylate resind. light cured polymethylmethacrylate resin

44. For a predictable prosthedontic result when occlusal, positional or esthetic changes are to be made, the first step is always

a. proper tooth reductionb. good diagnostic wax-upc. good impressiond. good diagnostic model

45. When constructing a temporary for a fixed partial bridge, you can use multiple single temporary crowns instead of a temporary bridge if you desire.

a. trueb. false

46. What can you use as a matrix for construction of a temporary restoration

a. plastic shellb. impression of unprepared toothC. impression of diagnostic castd. all of the above

47. The method of construction for an acrylic temporary that can be made with the least trauma to the tooth is

a. direct techniqueb. indirect technique

48. When using the indirect method, if you cure the acrylic with heat and under pressure, it

1. increases porosity2. decreases porosity3. increases hardness4. decreases hardness5. increases cross linkage which decreases the extent of polymerization6. increases cross linkage winch increases the extent of polymerization7. decreases cross linkage which decreases the extent of polymerization

a. 1, 4, 7b. 2, 4, 6c. 1, 3, 6d. 2,4,6e. 2,3,6

49. When using the indirect technique for construction of an acrylic temporary restoration, you should use

a. stoneb. quick set plasterc. improved stoned. plaster/pumice

50. When shaping the connector area of a provisional bridge, the entire embrasure area should be filled to prevent fracture.

a. trueb. false

51. The cause(s) for decementation of a restoration is(are)

a. occlusal prematuritiesb. inadequate retention and resistance form of the preparationc. contamination with salivad. all of the above

52. If tooth #8 is short, has a maximum amount of tooth destruction, and there s excessive vertical overlap, and it requires maximum esthetics, the restoration of choice is:

a. porcelain jacket crownb. porcelain fused to metal crownc. cast restorationd. b or c

53. The same situation as in #52 except the tooth has extensive destruction, which restoration should you use

a. porcelain jacketb. PFMc. cast restorationd. b or c

54. Overreduction of which surface can quickly destroy the resistance and retention form of anterior teeth

a. cingulumb. axialc. faciald. occlusal

55. In metal ceramic crowns and fixed partial dentures, the function of tin, indium and other readily oxidized minor components of the alloy is to:a. improve bondingb. decrease porosityc. react with the porcelain and make the opaque layer to mask the metald. improve thermal expansion matching between the metal and the porcelain

ANSWERS

1 B2 B3 C4 D5 A6 D7 C8 B

9 E10A 11C12D13E14C15A16A

17A18B19D20B21A22B23B24D25A26B27C28A29C30A31B32A33A34C35A36B

37D38B39A40C41D42C43A44B45B46D47B48E49B50B51D52A53B54A55A