Fixed II Midterm

The loss of a permanent mandibular first molar to caries early in life is relatively common. In the above scenario, which of the following may be a consequence if the tooth is not replaced?

A. Necessitates a more complex future prosthodontic treatment to replace the missing tooth and

correct the plane of occlusion.

B. Remaining teeth fracture due to the decreased workload.

C. In cases of a severely supraerupted opposing tooth, the opposing tooth is extracted and replaced to

restore the mouth to complete function, free of interferences.

D. Answers A and C only

E. Answers A, B and C

D

IUSD students are required to provide mounted diagnostic casts when presenting partially edentulous

prosthodontic treatment plans to prosthodontic faculty.

The Prosthodontic Treatment Plan Form must be filled out by the student and approved by the

prosthodontic faculty member prior to beginning the treatment.

A. Both statements are true.

B. The first statement is true. The second statement is false.

C. The first statement is false. The second statement is true.

D. Both statements are false.

A

Several factors must be considered prior to selecting a dental prosthesis for a partially edentulous patient.

Which of the following factors considers the number of teeth being replaced?

A. Span Length

B. Span Configuration

C. Abutment Condition

D. Abutment Alignment

E. None of the above

A

A 45 year old patient presents for a prosthodontic treatment plan to replace his missing tooth #5. The

patient's dental condition consists of no mobility of abutment teeth, moderate ridge resorption and

abutment teeth with large existing restorations.

Based on the above dental conditions, which dental prosthesis is the most ideal for the replacement of

missing teeth?

A. Conventional Fixed Partial Denture

B. Removable Partial Denture

C. Resin Bonded Fixed Partial Denture

D. Answers A and C

E. Answers A, B and C

A

The extracoronal restoration that is cemented to the prepared abutment tooth is called a retainer.

A. Both statements are true.

B. The first statement is true. The second statement is false.

C. The first statement is false. The second statement is true.

D. Both statements are false.

A

The size, shape and position of connectors all influence the success of the fixed partial denture. Which of

the following problems may occur if the connectors are too small?

A. Distortion of the prosthesis during occlusal loading

B. Food impaction

C. Inadequate access for oral hygiene aids

D. Answers A and B only

E. Answers A, B and C

D

Which of the following connectors is considered rigid?

A. Cast

B. Pre-ceramic soldered

C. Precision attachment

D. Answers A and B only

E. Answers A, B and C

D

Dental solders require a similar strength and color as the parent alloy.

As the gold content increases, the strength of the solder decreases.

A. Both statements are true.

B. The first statement is true. The second statement is false.

C. The first statement is false. The second statement is true.

D. Both statements are false.

A

Post-ceramic soldering is preformed to prevent damaging the ceramic.

The ideal melting point for a post-ceramic solder is around 1,130°C.

A. Both statements are true.

B. The first statement is true. The second statement is false.

C. The first statement is false. The second statement is true.

D. Both statements are false.

D

Abutment teeth and their supporting tissues must be evaluated to determine the overall prognosis of the

proposed treatment plan. Which of the following is preferred when selecting ideal FPD abutments?

A. Root canal treated teeth re-enforced by post and cores

B. #30 is preferred over #15 based on root configuration

C. 2:3 crown to root ratio

D. Answers B and C only

E. Answers A, B and C

C

Which of the following treatment options exceeds Ante's Law?

A. FPD from #18-#21

B. FPD from #13-#15

C. FPD from #6-#9

D. FPD from #31-#27

E. None of the above

D

A 35 year old patient presents to your office with a missing tooth #14. Tooth #15 has a slight mesial

inclination (10°). Tooth #13's lingual axial wall height measures 4.5 mm from the gingival margin. To

prevent violating the biological width, the finish line must be prepped at the gingival margin. The patient

is concerned with the esthetics only while she is smiling.

Which of the following is the best treatment option for the patient?

A. Path of insertion favoring #13; porcelain occlusion covering the functional cusp of #13

B. Path of insertion favoring #13; metal occlusion covering the non-functional cusp of #13

C. Path of insertion favoring #15; porcelain occlusion covering the functional cusp of #13

D. Path of insertion favoring #13; metal occlusion covering the functional cusp of #13

D

Which of the following is considered a disadvantage when selecting a metal ceramic crown?

A. Requires significant tooth reduction compared to a full gold crown.

B. Inferior esthetics when compared to an all ceramic crown

C. Custom characterization is not possible

D. Answers A and B only

E. Answers A, B and C

D

A 65 year old patient presents to your office for a metal ceramic crown prep of #29. You determine the patient has a centric contact point 0.5mm buccal to the central groove. Based on this information, which

of the following methods is more likely to cause the porcelain to fracture?

A. Placing the distal wing 1.0mm lingual to the central groove

B. Placing the metal-ceramic junction in the central groove

C. Placing the mesial wing 1.0mm buccal to the central groove

D. Answers B and C only

E. Answers A, B and C

D

Which of the following is not an ideal property of a provisional?

A. Biocompatible

B. Resistant to fracture

C. Exothermic

D. Good marginal adaptability

E. Dimensionally stable

C

A manufacturer's crown form for a provisional restoration is an example of a custom provisional.

You must use an indirect technique to fabricate a provisional restoration with this method.

A. Both statements are true.

B. The first statement is true. The second statement is false.

C. The first statement is false. The second statement is true.

D. Both statements are false.

D

Which of the following is/are advantage(s) for using the custom indirect technique to fabricate a

provisional?

A. More accurate

B. Shade matching is improved

C. Provides greater protection to the pulp

D. Answers A and C only

E. Answers A, B and C

D

The custom indirect technique provides greater protection to the pulp because of which of the following

reasons?

A. Material sets outside of the mouth

B. Trimming is performed outside of the mouth.

C. The prep cast used provides better visibility.

D. The provisional wall is thicker.

E. Because the vacuum formed matrix adds protection.

A

A 65 year old patient of record presents for replacement of her failing FPD from 6-11. She has elected to

replace the failing FPD with an identical FPD because it served her well (25 years). You have decided that

since it is such a long FPD, it is best to fabricate the provisional in advance using the indirect method.

Please place the fabrication steps in order.

1. Fabricate a prep cast.

2. Fabricate a diagnostic cast of existing FPD.

3. Make a matrix of the diagnostic cast.

4. Remarginate direct in the mouth.

5. Take an alginate of the prepared teeth.

6. Use the matrix to fabricate provisional on the prep cast.

7. Trim and initial polish.

A. 5, 1, 2, 3, 6, 7, 4

B. 1, 5, 2, 3, 7, 6, 4

C. 5, 2, 1, 3, 6, 7, 4

D. 2, 5, 1, 3, 6, 7, 4

D

Protemp Plus is a bis-acryl provisional material. What is/ are some of its disadvantages?

A. Expensive

B. Poor wear resistance

C. High polymerization shrinkage

D. Endothermic setting reaction

E. All of the above

A

At IUSD, in addition to Protemp Plus, Snap is commonly used. What type of acrylic is Snap?

A. Methyl methacrylate

B. Bis-acrylic

C. Ethyl-methacrylate

D. Bis GMA

E. Urethane dimethacrylate resins

C

Which type of pontic design was suggested for use when there is the highest esthetic requirement?

A. Ovate

B. Modified Ridge Lap

C. Sanitary

D. Conical

E. Saddle Ridge Lap

A

The modified ridge lap pontic is used in areas that are visible because it has good esthetics.

It is also cleansable because it is not concave.

A. Both statements are true.

B. The first statement is true. The second statement is false.

C. The first statement is false. The second statement is true.

D. Both statements are false.

A

A 72 yr old male with severe arthritis needs an FPD from 19-21. Which two pontic designs would be good

considerations for his case?

1. Sanitary

2. Saddle-Ridge Lap

3. Conical

4. Modified Ridge Lap

5. Ovate

A. 1 and 2

B. 2 and 3

C. 1 and 4

D. 3 and 4

E. 1 and 3

E

It is important to open embrasure spaces of the pontic area of a provisional in order to allow for effective

hygiene and to protect the papilla.

If the papilla blanches and remains blanched for several minutes upon placement of the provisional, no

further adjustment is required because the papilla will remodel on its own.

A. Both statements are true.

B. The first statement is true. The second statement is false.

C. The first statement is false. The second statement is true.

D. Both statements are false.

B

The loss of a permanent mandibular first molar to caries early in life is

relatively common. In the above scenario, which of the following is a

consequence if the tooth is not replaced?

A: The missing tooth decreases the patient's ability to masticate food

effectively.

B: The adjacent and opposing teeth drifting into the edentulous space

causing periodontal and occlusion problems.

C: The missing tooth decreases the patient's self esteem.

D: Answers B and C only

E: Answers A, B and C

E

IUSD students are required to provide unmounted diagnostic casts when

presenting partially edentulous prosthodontic treatment plans to

prosthodontic faculty. The Prosthodontic Treatment Plan Form must be filled

out by the student and approved by the prosthodontic faculty member prior

to beginning the treatment.

A: Both statements are true.

B: The first statement is true. The second statement is false.

C: The first statement is false. The second statement is true.

D: Both statements are false.

C

Several factors must be considered prior to selecting a dental prosthesis

for a partially edentulous patient. Which of the following factors involve good

alveolar bone support, no mobility, and rigid stabilization for a conventional

fixed partial denture?

A: Span length

B: Span configuration

C: Abutment condition

D: Periodontal condition

E: None of the above

D

A 45 year old patient presents for a prosthodontic treatment plan to

replace his missing teeth. The patient's dental condition consists of widely

divergent alignment of the abutment teeth, short clinical crowns and gross

tissue loss in the residual ridge location. Based on the above dental

conditions, which dental prosthesis is the most ideal for the replacement of

missing teeth?

A: Conventional fixed partial denture

B: Removable partial denture

C: Resin bonded fixed partial denture

D: Implant supported fixed partial denture

E: None of the above

B

A fixed partial denture, also known as a partial, is a prosthetic appliance

which is cemented to the remaining teeth and replaces one or more teeth.

The extracoronal restoration that is cemented to the prepared abutment

tooth is called a pontic.

A: Both statements are true.

B: The first statement is true. The second statement is false.

C: The first statement is false. The second statement is true.

D: Both statements are false.

D

The size, shape and position of connectors all influence the success of the

fixed partial denture. Which of the following problems may occur if the

connectors are too small?

A: Distortion of the prosthesis during occlusal loading

B: Food impaction

C: Inadequate access for oral hygiene aids

D: Answers A and B only

E: Answers Answers A, B and C

D

Post-ceramic soldering is preformed to prevent damaging the ceramic.

The ideal melting point for a post-ceramic solder is around 1,130°C.

A: Both statements are true.

B: The first statement is true. The second statement is false.

C: The first statement is false. The second statement is true.

D: Both statements are false

D

Abutment teeth and their supporting tissues must be evaluated to

determine the overall prognosis of the proposed treatment plan. Which of the

following is preferred when selecting ideal FPD abutments?

A: Root canal treated teeth re-enforced by post and cores

B: #30 is preferred over #15 based on root configuration

C: 2:3 crown to root ratio

D: Answers B and C only

E: Answer A, B, and C

C

Which of the following treatment options exceeds Ante's Law?

A: FPD from #18-#21, replacing missing teeth #19 and #20

B: FPD from #13-#15, replacing missing tooth #14

C: FPD from #6-#9, replacing missing teeth #7 and #8

D: Answers A and C only

E: None of the above

E

A 35 year old patient presents to your office with a missing tooth #14.

Tooth #15 has a slight mesial inclination (10°). Tooth #13's lingual axial wall

height measures 4.5 mm from the gingival margin. To prevent violating the

biological width, the finish line must be prepped at the gingival margin. The

patient is concerned with the esthetics only while she is smiling. Which of the

following is the best treatment option for the patient?

A: Path of insertion favoring #13;; metal occlusion covering the functional

cusp of #13

B: Path of insertion favoring #13;; porcelain occlusion covering the

functional cusp of #13

C: Path of insertion favoring #13;; metal occlusion covering the non-

functional cusp of #13

D: Path of insertion favoring #15;; porcelain occlusion covering the

functional cusp of #13

A

Which of the following is considered a disadvantage when selecting a

metal ceramic crown?

A: Requires significant tooth reduction compared to a full gold crown

B: Inferior esthetics when compared to an all ceramic crown

C: Custom characterization is not possible

D: Answers A and B only

E: Answers A, B, and C

D

A 65 year old patient presents to your office for a metal ceramic crown

prep of #29. You determine the patient has a centric contact point 0.5mm

buccal to the central groove. Based on this information, which of the

following methods is more likely to cause the porcelain to fracture?

A: Placing the mesial wing 1.0mm buccal to the central groove

B: Placing the distal wing 1.0mm lingual to the central groove

C: Placing the metal-ceramic junction 0.5mm lingual to the central groove

D: Answers A and C only

E: Answers A, B and C

A

Which of the following is not an ideal property of a provisional?

A: Biocompatible and non-irritating

B: Resistant to fracture

C: Exothermic

D: Good marginal adaptability

E: Dimensionally stable

C

Using a preformed methacrylate composite provisional to temporize is an example of a custom provisional. It is important to use the indirect technique

with this method.

A: Both statements are true.

B: The first statement is true. The second statement is false.

C: The first statement is false. The second statement is true.

D: Both statements are false.

D

Which of the following are advantages for using the custom indirect

technique to fabricate a provisional?

A: More accurate

B: Requires more chair time than the direct technique

C: Provides greater protection to the pulp

D: Answers A and C only

E: Answers A, B and C

D

The custom indirect technique provides greater protection to the pulp

because of which of the following reasons?

A: Material sets outside of the mouth

B: Trimming is performed outside of the mouth.

C: The prep cast used provides better visibility.

D: The provisional wall is thicker.

E: Because the vacuum formed matrix adds protection.

A

Modified ridge lap is used in areas that are visible because it has good

esthetics. It is also cleansable because it is not concave.

A: Both statements are true.

B: The first statement is true. The second statement is false.

C: The first statement is false. The second statement is true.

D: Both statements are false.

A

A 72 yr old male with severe arthritis needs an FPD from 19-21. Which

two pontic designs would be good considerations for his case? 1. Sanitary 2.

Saddle-ridge lap 3. Conical 4. Modified ridge lap 5. Ovate

A: 1 and 2

B: 2 and 3

C: 1 and 5

D: 3 and 4

E: 1 and 3

E

A dental laboratory work authorization is written instructions from the dental laboratory to the dentist

providing detailing information required by law.

The laboratory work authorization should include material specifications regarding the type of alloy to be

utilized for a fixed partial denture.

A. Both statements are true.

B. The first statement is true. The second statement is false.

C. The first statement is false. The second statement is true.

D. Both statements are false.

C

Which of the following items should be included on a dental laboratory authorization form when requesting

the fabrication of an all ceramic crown restoration for tooth #12?

A. The type of alloy to be used.

B. The type of pontic to be used.

C. The type of connector to be used.

D. The shade to be used.

E. All of the above should all be included on the laboratory authorization form.

D

The ADA issued guidelines to improve the relationship and overall communication between the dentist and

the dental laboratories.

When these guidelines are followed, the outcome should help increase the efficiency and quality of patient

care.

A. Both statements are true.

B. The first statement is true. The second statement is false.

C. The first statement is false. The second statement is true.

D. Both statements are false.

A

Which of the following is NOT a responsibility of the dentist when submitting laboratory patient cases?

A. Accurate impressions

B. Properly trimmed bite registrations

C. Identifying the posterior palatal extension for a removable prosthesis

D. Selecting prosthetic teeth for a removable prosthesis

E. All of the above are responsibilities of the dentist.

E

When trimming dies for a fixed partial denture, the #1 die contains all abutment teeth with the edentulous

areas carved away for developing the wax coping.

When trimming the bite registration material, the registration should only cover the cusps tips of the

abutment teeth and opposing teeth.

A. Both statements are true.

B. The first statement is true. The second statement is false.

C. The first statement is false. The second statement is true.

D. Both statements are false.

C

The dental laboratory is responsible for matching the coloration and characterization described in the

written instructions on the lab authorization form.

The dental laboratory must inform the dentist of any subcontracting of a laboratory case.

A. Both statements are true.

B. The first statement is true. The second statement is false.

C. The first statement is false. The second statement is true.

D. Both statements are false.

A

A 30 year old dentate patient presents for a 3 unit FPD from #29 to #31. After submitting the laboratory

case, the laboratory technician reviews the case and discovers insufficient occlusal reduction on #31 for a full gold FPD retainer. Which of the following is the best option for resolving this situation while respecting

the responsibilities of the dental team members?

A. The dental laboratory fabricates the FPD and advises the dentist to reduce on the opposing dentition

to create the appropriate occlusal clearance.

B. The dental laboratory informs the dentist about the problem and the dentist reviews the lab case to

determine the appropriate treatment strategy.

C. The dental laboratory informs the patient about the problem and advises the patient to make another

appointment with the dentist to reduce the preparation and take a new master impression.

D. All of the above are acceptable options.

B

Which of the following statements is FALSE in regards to requirements for dies and working casts for FPD high noble cast restorations?

A. The #1 dies must be dense, free of voids or marks along finish lines

B. The dies and working cast should be poured from the same impression.

C. The dies and working cast should be fabricated using a vacuum-mixed dental stone.

D. The dies and working cast should be poured using Type V dental stone.

E. All of the above true statements.

D

Which of the following items should be included on a dentist's laboratory

authorization form that is sent to the dental laboratory when requesting

fabrication of a fixed partial denture?

A: The type of metal alloy you have chosen.

B: The type of pontic you have chosen.

C: The patient's name and complete medical history.

D: Answers A and B only

E: Answers A, B and C should be included on the lab authorization form.

D

All of the following statements with regards to requirements for dies and working casts for cast restorations are true EXCEPT one. Which one is that

EXCEPTION?

A: They need to be accurate and must be a true representation of the

prepared surfaces.

B: They must be poured using Type II dental stone.

C: You must be able to clearly visualize all margins.

D: They should be poured using a dental stone that has been vacuum

mixed.

E: A, B, C and D are all true statements.

B

You are consistently having trouble trapping bubbles when you pour your

master impression, so you review the basics described in class and your

textbook. Of the following, which suggestion would not be a correct means of

handling the dental stone used to pour up a final impression for a cast

restoration?

A: Mechanically mix the dental stone under vacuum.

B: Use the manufacturer's suggested water/powder ratios.

C: Spray the impression with a surface tension reducer or debubblizer

prior to pouring.

D: Add approximately 2 ml more water to allow for a smoother mix which

decreases the chances of trapping air bubbles in strategic places.

E: Answers A, B, C and D are all correct means for handling the dental

stone used to pour a final impression for a cast restoration.

D

When submitting a patient case to a dental laboratory, proper articulation

of the opposing casts (providing an accurate mounting of casts and/or an

accurate bite registration) is one of the responsibilities of the dentist. Proper

infection control is only the dental laboratories' responsibility.

A: Both statements are true.

B: The first statement is true. The second statement is false.

C: The first statement is false. The second statement is true.

D: Both statements are false.

B

When pouring dies for a 3 unit FPD, one pre-measured stone packet (70

grams) is a sufficient amount of stone for each die. When trimming dies for a

fixed partial denture, the #2 die contains all abutment teeth with the

edentulous areas carved away for proper margination.

A: Both statements are true.

B: The first statement is true. The second statement is false.

C: The first statement is false. The second statement is true.

D: Both statements are false.

B

The purpose of the bite registration is to help orient the prep cast to the

opposing cast for mounting. It is best to not trim the registration because

bulk of material provides a more accurate registration.

A: Both statements are true.

B: The first statement is true. The second statement is false.

C: The first statement is false. The second statement is true.

D: Both statements are false.

B

A 30 year old dentate patient presents for a 3 unit FPD from #29 to #31.

With regards to the opposing maxillary cast, which of the following would

cause problems when fabricating the final restoration?

A: Anterior teeth not fully captured

B: Small voids present in the vestibule

C: Only part of the palate captured in impression

D: Positive bubble present on the buccal of #3

E: Answers B and C only

A

For a modified ridge lap pontic, where should the pontic contact the ridge?

A: Gingivofacial line angle

B: Lingual to crest of the ridge

C: Only at the crest of the ridge

D: Facial to the crest of the ridge

E: Only A and B are correct.

D

Statement 1: The modified ridge lap pontic is slightly wider mesiodistally

at the lingual aspect and narrower at the facial aspect. Statement 2: The

contact with the crest of the ridge should be broad versus compact.

A: Both statements are true.

B: The first statement is true. The second statement is false.

C: The first statement is false. The second statement is true.

D: Both statements are false.

D

Which of the following statements regarding modified ridge lap is true?

A: The lingual half of the tissue side is slightly concave.

B: Only the facial half of the tissue side is in contact with the ridge.

C: The gingivofacial line angle should lap the ridge completely like a

saddle instead of curving lingually towards the crest of the ridge.

D: Only A and C are correct.

E: Only B and C are correct.

B

If the facial aspect of a MCC prep is not prepped in 2 planes, what may

result?

A: The opaque may show through.

B: The pulp may be violated.

C: The restoration may be overbulked.

D: Only B and C are correct.

E: A, B and C are correct.

E

Which of the following is correct with regards to the draw of the 6-8 prep?

A: Both preps should converge incisally.

B: Both preps should be prepped slightly mesial to the long axis, so that

the resulting restoration draws to the mesial.

C: The mesial aspects of both preps should have taper. The distal wall

should not have taper.

D: The distal aspect of both preps should have taper. The mesial walls

should not have taper.

A

When choosing the path of placement for E4D restorations, which of the following view(s) aid in setting the correct oritentation of the 3D model?

A. Mesial

B. Occlusal

C. Buccal.

D. Answers A and B

E. Answers B and C

E

Statement 1: When capturing images using the E4D system, the clinician must point the IOD distally.

Statement 2: The first e4D scan must be 30 degrees soft roll over the prep to the right side of the IOD.

A. Both statements are true.

B. The first statement is true and the second is false.

C. The first statement is false and the second is true.

D. Both statements are false.

B