MCQs in Prosthodontics

Chapter 4: Fixed Partial Dentures

 

 

1- When planning dental treatment, principles of aesthetic dentistry are important. Which of the following statements regarding aesthetic dentistry are correct?

  1. The so-called ‘golden proportion’ is a ratio between height and width. The golden proportion of 1.5:1 of height to width ratio of incisors is aimed for, as this is thought to be aesthetically pleasing.
  2. When considering the symmetry of a patient’s dentition the width of the teeth is more noticeable than the height, which is more noticeable than the depth of the teeth.
  3. When considering the symmetry of a patient’s dentition the depth is more important than the height, which is more noticeable than width of teeth.
  4. Black triangles, which appear with loss of gingival tissue, are much more noticeable in patients with low smile lines than high smile lines.
  5. The desirable maxillary gingival contour has the highest gingival margin over the central incisor, followed by the canine and then the lateral incisor.

 

 

 

 

The answer is: B

 

2-The intermediate abutment in fixed prosthesis is also known as:

  1. Maryland abutment
  2. Marry abutment
  3. Pier abutment
  4. S2 abutment
  5. None of the above

 

 

 

 

The answer is: C

 

3-Which of the following is least retentive as compared to the others:

  1. All cast metal crown
  2. All ceramic crown
  3. Partial veneer crown
  4. Inlay and onlay
  5. They are all the same

 

 

 

 

The answer is: D

 

 4-The recommended porcelain jacket crown is:

  1. 5 mm
  2. 5 mm
  3. 2 mm
  4. 5 mm
  5. 0 mm

 

 

 

 

The answer is: B

 

5-In porcelain jacket crown, centric contacts:

  1. Are confined to facial surface
  2. Are confined to incisal third of the lingual surface
  3. Are confined to middle third of the lingual surface
  4. Are not recommended
  5. None of the above

 

 

 

 

The answer is: C

 

6-The intended metal ceramic junction should be at:

  1. 30 degrees
  2. 45 degrees
  3. 60 degrees
  4. 90 degrees
  5. 120 degrees

 

 

 

 

The answer is: C

 

7-The minimum thickness of metal coping of base metal alloys is:

  1. 1 mm
  2. 2 mm
  3. 3 mm
  4. 4 mm
  5. 5 mm

 

 

 

 

The answer is: B

 

8-Which of the following would be an ideal abutment:

  1. Carious tooth
  2. Carious restored tooth
  3. Unrestored caries free tooth
  4. Endodontically restored tooth
  5. None of the above

 

 

 

 

The answer is: C

 

9-Which of the following would provide better support in FPD:

  1. A molar with divergent roots
  2. A molar with conical roots
  3. A molar with little interradicular bone
  4. A tilted molar with short roots
  5. None of the above

 

 

 

 

The answer is: A

 

10-A long span FPD must be fabricated with a material having:

  1. Low strength
  2. Low rigidity
  3. High strength
  4. High strength and high rigidity
  5. None of the above

 

 

 

 

The answer is: D

 

11-When replacing the four maxillary incisors with FPD, the abutment usually used are:

  1. Maxillary canines only
  2. Maxillary 1st premolars only
  3. Both maxillary canines and 1st premolars
  4. Maxillary canine and both 1st and 2nd premolars
  5. None of the above

 

 

 

 

The answer is C

 

12-When replacing the four maxillary later incisors and canines with FPD, the abutment usually used are:

  1. Maxillary 1st premolars only
  2. Maxillary centrals only
  3. Both maxillary centrals and 1st premolars
  4. Both maxillary centrals and both 1st and 2nd premolars
  5. None of the above

 

 

 

 

The answer is: D

 

 13-Which of the following margins is recommended on the labial margin of a metal ceramic FPD:

  1. Chamfer
  2. Shoulder
  3. Chisel edge
  4. Feather edge
  5. None of the above

 

 

 

 

The answer is: B

 

14-The recommended clearance if centric cusps in all cast metal FPD is:

  1. 1 mm
  2. 5 mm
  3. 2 mm
  4. 5 mm
  5. 3 mm

 

 

 

 

The answer is: A

 

15-The recommended incisal reduction for metal ceramic crown is:

  1. 1 mm
  2. 2 mm
  3. 3 mm
  4. 4 mm
  5. None of the above

 

 

 

 

 

The answer is: B

 

16- The desirable degree of taper of a preparation to receive a cast restoration is:

  1. <2°
  2. 2–4°
  3. 5–7°
  4. 8–12°
  5. >12°

 

 

 

 

The answer is: C

 

 

17-The intermediate abutment in fixed prosthesis is also known as:

  1. Maryland abutment
  2. Marry abutment
  3. Pier abutment
  4. S2 abutment
  5. None of the above

 

 

 

 

 

The answer is: C

 

18-Which of the following is least retentive as compared to the others:

  1. All cast metal crown
  2. All ceramic crown
  3. Partial veneer crown
  4. Inlay and onlay
  5. They are all the same

 

 

 

 

 

The answer is: D

 

19-The recommended porcelain jacket crown is:

  1. 5 mm
  2. 5 mm
  3. 2 mm
  4. 5 mm
  5. 0 mm

 

 

 

 

 

The answer is: B

 

20-In porcelain jacket crown, centric contacts:

  1. Are confined to facial surface
  2. Are confined to incisal third of the lingual surface
  3. Are confined to middle third of the lingual surface
  4. Are not recommended
  5. None of the above

 

 

 

 

 

The answer is: C

 

21-The intended metal ceramic junction should be at:

  1. 30 degrees
  2. 45 degrees
  3. 60 degrees
  4. 90 degrees
  5. 120 degrees

 

 

 

 

 

The answer is: C

 

22-The minimum thickness of metal coping of base metal alloys is:

  1. 1 mm
  2. 2 mm
  3. 3 mm
  4. 4 mm
  5. 5 mm

 

 

 

 

 

The answer is: B

 

23-Which of the following would be an ideal abutment:

  1. Carious tooth
  2. Carious restored tooth
  3. Unrestored caries free tooth
  4. Endodontically restored tooth
  5. None of the above

 

 

 

 

 

The answer is: C

 

24-Which of the following would provide better support in FPD:

  1. A molar with divergent roots
  2. A molar with conical roots
  3. A molar with little interradicular bone
  4. A tilted molar with short roots
  5. None of the above

 

 

 

 

 

The answer is: A

 

25-A long span FPD must be fabricated with a material having:

  1. Low strength
  2. Low rigidity
  3. High strength
  4. High strength and high rigidity
  5. None of the above

 

 

 

 

 

The answer is: D

 

26-When replacing the four maxillary incisors with FPD, the abutment usually used are:

  1. Maxillary canines only
  2. Maxillary 1st premolars only
  3. Both maxillary canines and 1st premolars
  4. Maxillary canine and both 1st and 2nd premolars
  5. None of the above

 

 

 

 

 

The answer is C

 

27-When replacing the four maxillary later incisors and canines with FPD, the abutment usually used are:

  1. Maxillary 1st premolars only
  2. Maxillary centrals only
  3. Both maxillary centrals and 1st premolars
  4. Both maxillary centrals and both 1st and 2nd premolars
  5. None of the above

 

 

 

 

 

The answer is: D

 

28-Which of the following margins is recommended on the labial margin of a metal ceramic FPD:

  1. Chamfer
  2. Shoulder
  3. Chisel edge
  4. Feather edge
  5. None of the above

 

 

 

 

 

The answer is: B

 

29-The recommended clearance if centric cusps in all cast metal FPD is:

  1. 1 mm
  2. 5 mm
  3. 2 mm
  4. 5 mm
  5. 3 mm

 

 

 

 

 

 

The answer is: A

 

30-The recommended incisal reduction for metal ceramic crown is:

  1. 1 mm
  2. 2 mm
  3. 3 mm
  4. 4 mm
  5. None of the above

 

 

 

 

 

 

The answer is: B

 

Dental Implant MCQs

 

1-Implants are most often made of:

  1. Titanium
  2. Hydroxyapatite
  3. Stainless steel
  4. Gold alloy
  5. None of the above

 

 

 

 


The answer is: A

 

2-The rough surface of implants is:

  1. Due to fabrication errors
  2. Not desirable for osseointegration
  3. Important to remove at the neck so that gingival plaque does not attach
  4. Desirable for improved osseointegration
  5. None of the above

 

 

 

 



The answer is: D

 

3-Osseointegration means:

  1. Full contact between bone and the implant body
  2. Fibrous attachment to the implant
  3. 40% to 70% bone/implant contact
  4. Clinical detection of a particularly stable implant
  5. None of the above

 

 

 

 


The answer is: C

 

 4-The first event leading to osseointegration that occurs after implant placement is:

  1. Growth of new bone cells
  2. Formation of a blood clot
  3. Growth of fibrous tissue
  4. Gingival downgrowth
  5. None of the above

 

 

 

 

 


The answer is: B

 

5-Excessive force on implant crowns results in:

  1. Trauma to bone
  2. Immediate fracture of implant components
  3. Fatigue of implant components, leading to fracture
  4. No damage to implants because of their high resistance to force
  5. None of the above

 

 

 

 



The answer is: C

 

6-Preload is:

  1. Placement of a screw without the application of adequate torque
  2. Pressure on a provisional crown
  3. Tension placed by screws to protect implant components from displacing forces
  4. The force transmitted by the crown to the implant
  5. None of the above

 

 

 

 

 


The answer is: C

 

7-Plaque and calculus:

  1. Do not attach on implants
  2. Attach loosely to implants
  3. Have a different composition on implants
  4. Accumulate on implants similarly to teeth
  5. None of the above

 

 

 

 



The answer is: D

 

8-Connective tissue fibers around the implant neck are:

  1. Perpendicular to the implant surface
  2. Not present because there is no connective tissue
  3. Parallel to the implant surface
  4. Multidirectional
  5. None of the above

 

 

 

 



The answer is: C

 

9-Peri-implantitis:

  1. Is equivalent to gingivitis
  2. Cannot be treated
  3. Is usually limited to superficial soft tissue
  4. Spreads rapidly to bone
  5. None of the above

 

 

 

 

 



The answer is: D

 

10-Implant survival:

  1. Is synonymous with implant success
  2. Means that an implant is still present in the mouth after a period of time
  3. Means that an implant is present and clinically satisfactory after a period of time
  4. Means that the implant required some form of treatment to avoid failure
  5. None of the above

 

 

 

 



The answer is: B

 

11-The minimum interarch space for a fixed implant-supported prosthesis is:

  1. 4 mm
  2. 6 mm
  3. 7 mm
  4. 12 mm
  5. None of the above

 

 

 

 


The answer is: 7 mm

 

12-Ridge mapping measures:

  1. Attached gingiva by outlining the mucogingival junction
  2. Soft tissues on a stone model
  3. Bone width on a tomogram
  4. Soft tissue thickness clinically to deduce bone width
  5. None of the above

 

 

 

 



The answer is: D

 

13-Panoramic radiographs are useful for:

  1. Ruling out bony pathologies and estimating bone availability
  2. Performing precise measurements of bone height and width
  3. Selecting the height and width of implants
  4. Detecting all existing anatomic limitations
  5. None of the above

 

 

 

 



The answer is: A

 

14-Computed tomography:

  1. Is the most precise radiographic technique
  2. Delivers low doses of radiation
  3. Is performed by a machine that is the size of a panoramic machine
  4. Should be prescribed in all implant cases
  5. None of the above

 

 

 

 


The answer is: A

 

15-Cone beam computed tomography:

  1. Is less accurate than conventional computed tomography
  2. Uses less radiation than conventional computed tomography
  3. Delivers precise bone density measurements
  4. Can only be used for small regions of interest
  5. None of the above

 

 

 

 


The answer is:  B

 

16-Hounsfield numbers are:

  1. Values that are designed to measure bone density
  2. Arbitrary numbers set for tissue density on computed tomograms
  3. Used in dentistry only
  4. Arbitrary numbers set for density on magnetic resonance imaging
  5. None of the above

 

 

 

 

 

The answer is:  B

 

17-Radiographic templates are:

  1. Used to visualize diagnostic teeth
  2. Used to measure bone density
  3. Used during implant surgery
  4. Not useful in most implant cases
  5. None of the above

 

 

 

 


The answer is:  A

 

18-A scannographic template is:

  1. A requirement for aligning the mandible when taking computed tomography radiographs
  2. Identical to any other radiographic template
  3. Useful during implant surgeries
  4. An aide for visualizing diagnostic teeth on a computed tomography image
  5. None of the above

 

 

 

 

 

The answer is:  D

 

19-Which of the following statements about bone quality is true:

  1. D4 bone is the densest bone
  2. D1 bone is the densest bone
  3. There is a direct correlation between bone density and implant survival rate
  4. Bone quality is determined precisely based on Hounsfield numbers
  5. None of the above

 

 

 

 

 

The answer is:  B

 

20-When selecting an implant:

  1. It's best to choose the longest implant possible, because the longest implants survive best
  2. It's best to choose the widest implant possible, because the widest implants survive best
  3. Implant surface selection is critical
  4. At least 1 mm of bone lingual and buccal of the implant must remain for it to survive
  5. None of the above

 

 

 

 

 

The answer is:  D

 

21-Screw-retained prostheses possess the following advantages:

  1. Ease of fabrication
  2. Ease of retrieval
  3. Esthetics
  4. Ease of connection to natural teeth
  5. None of the above

 

 

 

 

 

The answer is:  B

 

 22-Cemented prostheses possess the following advantages:

  1. Ease of fabrication
  2. Ease of retrieval
  3. Strong resistance
  4. Ease of connection to natural teeth
  5. All of the above

 

 

 

 

 

 

The answer is:  A

 

23-Connecting implants and teeth:

  1. Is forbidden
  2. Is useful for consolidating teeth with reduced periodontal support
  3. Can be performed in all cases
  4. Should be avoided whenever possible, but can be performed with careful consideration
  5. None of the above

 

 

 

 

 

The answer is:  D

 

24- When treatment planning edentulous cases:

  1. Removable prostheses are always preferable
  2. Fixed prostheses are always preferable
  3. The decision between a fixed or removable prosthesis depends in part upon arch shape
  4. A fixed and a removable prosthesis can achieve the same goals
  5. None of the above

 

 

 

 

 

The answer is:  C

 

25-Distal cantilevers on implant prostheses are:

  1. Always possible, with no limitations
  2. To be avoided whenever possible and limited to short spans
  3. Always detrimental and impossible to implement with implant restorations
  4. Possible when a removable full denture opposes the implant prosthesis
  5. All of the above

 

 

 

 

 

The answer is:  B

 

26-Immediate implant placement is:

  1. The placement of an implant at the time of tooth extraction
  2. The placement of multiple implants at once
  3. The placement of a restoration at the time of implant placement
  4. The placement of a restoration at the time of surgical uncovering
  5. None of the above

 

 

 

 

 

 

The answer is:  A

 

27-Immediate loading is:

  1. The placement of an implant at the time of tooth extraction
  2. The placement of a restoration at the time of implant placement
  3. The placement of a restoration at the time of surgical uncovering
  4. The placement of a one-stage implant
  5. None of the above

 

 

 

 

 

 

 

The answer is:  B

 

28-Provisional restorations:

  1. Can rest on bone grafts and implants
  2. Should not rest on bone grafts or newly placed implants
  3. Are not appropriate immediately after implant placement
  4. Are not appropriate immediately after bone grafting
  5. None of the above

 

 

 

 

 

The answer is:  B

 

29-Bone grafting:

  1. Works best to augment ridge height
  2. Is limited to 2 mm augmentations or less
  3. Works best to augment ridge width
  4. Does not work in general
  5. None of the above

 

 

 

 

 

The answer is:  C

 

30-Gingival grafts should be performed:

  1. Prior to fabricating the final restoration
  2. Preferably after the final restoration is delivered
  3. Only prior to implant placement
  4. Only between stage one and stage two surgeries
  5. None of the above

 

 

 

 

 

The answer is:  A

 

31-Characteristics of implant-level impressions are:

  1. Coping placement is easy because of visibility
  2. Custom abutments are not available
  3. Abutments must be selected in the mouth
  4. Abutments can be selected in the laboratory
  5. All of the above

 

 

 

 

 

 

The answer is:  D

 

32-Transfer-type impression copings:

  1. Require a hole in the impression tray
  2. Are easier to utilize than pick-up copings
  3. Remain on the implant when the impression
  4. Should be utilized in the anterior part of the mouth only
  5. None of the above

 

 

 

 

 

The answer is:  C

 

33-Pick-up type impression copings:

  1. Need no modification of the impression tray
  2. Remain in the impression when removed
  3. Are always more precise than transfer copings
  4. Are particularly useful in the posterior part of the mouth

 

 

 

 

 

The answer is:  B

 

34-To verify that abutments and crowns are engaging external connection systems:

  1. Tactile sense is satisfactory
  2. A radiograph alone is satisfactory
  3. No check is necessary
  4. A combination of clinical and radiographic checks are recommended
  5. None of the above

 

 

 

 

 

The answer is:  D

 

35- For crowns in the esthetic zone, soft tissue support:
 

  1. Can be created in the abutment only
  2. Can be created in the crown only
  3. Can be created in the abutment and the crown
  4. Can only be achieved with screw-retained crowns
  5. None of the above

 

 

 

 

 

The answer is:  C

 

36-Implant indexing is:

  1. A radiographic technique
  2. A method of impression-taking at the time of surgical placement
  3. A method of recording gingival tissues
  4. A diagnostic method of determining ideal implant position
  5. None of the above

 

 

 

 

 

The answer is:  B

 

37-Passive fit is:

  1. The placement of an abutment without resistance
  2. The placement of a single crown without resistance
  3. The delivery of a screw without resistance until the last quarter turn
  4. The placement of a bridge without resistance
  5. None of the above

 

 

 

 

 

The answer is:  D

 

38-Testing if screws can turn without resistance until the last quarter turn is:

  1. Useful for verifying proper fit in multi-unit restorations
  2. Only useful for implant bars
  3. Only useful for single restorations
  4. Useless in most clinical cases
  5. None of the above

 

 

 

 

 

The answer is:  A

 

39-After delivery of a screw-retained bridge:

  1. It is important to close the screw access hole immediately with a permanent material
  2. It is recommended to block the screw access hole with a temporary material
  3. It is recommended to take measures so that screws will not need to be retightened at a later time
  4. It is recommended to remove the bridge and reposition it at a later time
  5. None of the above

 

 

 

 

 

The answer is:  B

 

40-For removable prostheses:

  1. The male attachment is usually part of the denture
  2. The attachment components do not have to be replaced
  3. The female component may need replacement during maintenance
  4. Screws are not accessible
  5. None of the above

 

 

 

 

 

The answer is:  C

 

41-When using a two-stage implant, radiographic bone level is expected to be:

  1. At the top of the abutment
  2. Flush with the implant head
  3. At the level of the first thread
  4. 4-5 mm apical to the implant head
  5. None of the above

 

 

 

 

 

The answer is:  C

 

42-Mobility of an implant-supported crown generally means:

  1. Failure of the implant
  2. Occlusal traumatism
  3. Normal flexing of abutments
  4. Loosening of an implant component
  5. None of the above

 

 

 

 

 

The answer is:  D

 

43-Clinical inflammation around a single restored implant, associated with pain or pressure, but no radiographic bone loss, is most likely due to:

  1. Implant failure
  2. Peri-implantitis
  3. Fracture of a component
  4. Loosening of a component
  5. None of the above

 

 

 

 

 

The answer is:  D

 

44-If an implant has been placed apically, a 7 mm peri-implant probing shows no sign of inflammation, and there is no radiographic change and no bleeding, this probably indicates:

  1. Normal functioning
  2. Peri-implantitis
  3. Implant failure
  4. Component failure
  5. None of the above

 

 

 

 

 

The answer is:  A

 

45-At a maintenance visit, an implant-retained bar is found to be mobile at one extremity. The following should be undertaken:
 

  1. Place a watch in the records and reevaluate at the next visit
  2. Refer for implant removal
  3. Tighten the probable loose screw
  4. Verify that the screw is loose and place a new one
  5. None of the above

 

 

 

 

 

The answer is:  D

 

 46-When observing a routine radiograph for an implant patient, you see a horizontal dark line between the implant and what seems to be the abutment. This is probably:

  1. Normal
  2. A sign of component loosening
  3. A sign of peri-implantitis
  4. A sign of implant failure
  5. None of the above

 

 

 

 

 

The answer is:  B

 

47-Maintenance instrumentation for implants:
 

  1. Is identical to instrumentation used on teeth
  2. Should be plastic only
  3. Is not necessary
  4. Must not be made of stainless steel
  5. None of the above

 

 

 

 

 

The answer is:  D

 

48-If a patient has removable dentures, what generally needs to be done at yearly visits:

  1. A change of abutment screws
  2. A change of female attachments
  3. A reline of dentures
  4. A change of abutments
  5. None of the above

 

 

 

 

The answer is:  B