Treatment Planning For The Single-Tooth Short Question And Answers

Treatment Planning Single Tooth Multiple Choice Questions

Question 1. Which one of the following intra-coronal restorations is plastic in nature?

1. Metal inlay.
2. Ceramic inlay.
3. Complex amalgam.
4. MOD on lay.
5. Ceramic on lay.

Answer. 3. Complex amalgam.

Question 2. Which one of the following is a cemented intracoronal restoration?

1. Glass ionomer.
2. Simple amalgam.
3. Complex amalgam.
4. Metal inlay.
5. Ceramic veneer.

Answer. 4. Metal inlay.

Question 3. Which one of the following materials should be protected (e.g. by resin) for 24 hours after restoring the tooth?

1. Glass ionomer cement.
2. Zinc polycarboxylate.
3. Resin-modified glass ionomer.
4. Zinc oxide eugenol.
5. Compomer.

Answer. 1. Glass ionomer cement.

Question 4. Which temporary restorative material is least favorable to use when it is to be replaced by a resin composite restoration?

1. Zinc polycarboxylate.
2. Compomer.
3. Zinc oxide eugenol.
4. Conventional glass ionomer.
5. Zinc phosphate.

Answer. 3. Zinc oxide eugenol.

Question 5. The choice of intracoronary restoration in an incipient lesion is:

1. Glass ionomer.
2. Simple amalgam.
3. Complex amalgam.
4. Metal inlay.
5. Ceramic onlay.

Answer. 1. Glass ionomer.

Question 6. The intraoral restoration of choice in class 4 lesions is:

1. Glass ionomer.
2. Simple amalgam.
3. Complex amalgam.
4. Composite resin.
5. Ceramic onlay.

Answer. 4. Composite resin.

Question 7. The restorative material that releases fluoride is:

1. Glass ionomer.
2. Simple amalgam.
3. Complex amalgam.
4. Composite resin.
5. Metal inlay.

Answer. 1. Glass ionomer.

Question 8. The restorative material which fails due to polymerization shrinkage is:

1. Glass ionomer.
2. Simple amalgam.
3. Complex amalgam.
4. Composite resin.
5. Metal inlay.

Answer. 4. Composite resin.

Question 9. The choice of intracoronary restoration when the cusps are to be replaced:

1. Glass ionomer.
2. Simple amalgam.
3. Complex amalgam.
4. Composite resin.
5. Metal inlay.

Answer. 3. Complex amalgam.

Question 10. The choice of intracoronary restoration when the teeth are endodontically treated:

1. Glass ionomer.
2. Simple amalgam.
3. Complex amalgam.
4. Composite resin.
5. Metal inlay.

Answer. 3. Complex amalgam.

Question 11. The choice of intracoronary restoration when the isthmus is wider:

1. Metal inlay.
2. Ceramic inlay.
3. Complex amalgam.
4. Glass ionomer.
5. MOD Onlay.

Answer. 5. MOD Onlay.

Question 12. Which one of the following intracoronal restoration is most appropriate in an esthetic zone where the isthmus preparation is narrower?

1. Metal inlay.
2. Ceramic inlay.
3. Complex amalgam.
4. MOD onlay.
5. Ceramic onlay.

Answer. 2. Ceramic inlay.

Question 13. An extra coronal restoration that requires minimal tooth preparation is the:

1. Metal-ceramic crown.
2. Ceramic veneer.
3. All ceramic crowns.
4. All metal crown.
5. All acrylic crowns.

Answer. 2. Ceramic veneer.

Question 14. The extra coronal restoration of choice when longevity is the main consideration is a:

1. Metal–ceramic crown.
2. Ceramic veneer.
3. All ceramic crowns.
4. All metal crown.
5. All acrylic crowns.

Answer. 4. All metal crowns.

Question 15. The choice of extra coronal restoration when it needs retention and esthetics:

1. Metal–ceramic crown.
2. Ceramic Veneer.
3. All ceramic crowns.
4. Full metal crown.
5. Acrylic crown.

Answer. 1. Metal-ceramic crown.

Question 16. A large resin composite restoration was placed to replace a fractured buccal cusp; during the review appointment, brown bands were noted on the buccal surface of the restoration. This is caused by:

1. The placement of a single increment of resin composite on the buccal surface.
2. The use of a metal matrix band constituents reacting with the uncured resin composite.
3. Polymerization contraction causes microspaces between increments that become stained.
4. Staining of resin composite due to a smoking habit.
5. White spot lesions become stained due to dietary constituents.

Answer. 3. Polymerization contraction causes microspaces between increments that become stained.

Treatment Planning For Missing Tooth

Multiple Choice Questions

Question 1. Which one of the following is an ideal crown–root ratio for an abutment tooth?

1. 3:2.
2. 1:1.
3. 2:3.
4. 2:1.
5. 3:1.

Note: Minimum acceptable crown: root ratio is 1:1.

Answer. 3. 2:3.

Read And Learn More: Fixed Partial Denture Short Essay Question And Answers

Question 2. Which one of the following root configurations is preferred for an abutment tooth?

Broader labiolingual roots.

1. Conical and converged roots.
2. Fused roots.
3. Perfectly tapered roots.
4. Round in cross-section.

Answer. 1. Broader labiolingual roots.

Question 3. Regarding the maximum occlusal force created by the natural dentition and different types of prosthesis, which one of the following is correct?

1. Natural dentition > partial removable > fixed > complete removable.
2. Natural dentition ≥ fixed > partial removable = complete removable.
3. Natural dentition > fixed > partial removable > complete removable.
4. Natural dentition = fixed > partial removable = complete removable.
5. Natural dentition = fixed = partial removable = complete removable.

Answer. 3. Natural dentition > fixed > partial removable > complete removable.

Short Answer Questions

Question 1. A 45-year-old patient presents with the following dentition. The patient would like to restore his missing upper left second premolar tooth [FDI 25]. The patient is healthy and medically fit.

1. List six investigations you would carry out prior to restoring the missing FDI 25.

• OHI
• Mobility test
• Pocket depth
• Sensibility test on FDI 26
• Radiographic examination of the abutments
• Diagnostic casts.

2. What are two treatment options to consider in replacing the missing FDI 25.

• Crown for 24 and upper cast removable partial denture
• Crown for 24 and single unit implant to replace 25
• Three-unit conventional bridge.

Cantilever bridge for 24 and 25

Question 2. A 20-years-old fit and healthy lady attends your practice complaining of gaps between her upper front teeth. History and examination reveal that there is space between her central incisors and canine on both sides because of her missing upper lateral incisors.

Fill in the given table with five treatment options that you may consider for this patient. Give one advantage and one disadvantage for each treatment option.

Principles Of Tooth Preparation

Multiple Choice Questions

1. Periodontal considerations are important when planning any fixed prosthodontic treatment. For optimum periodontal health, restoration finish lines should be placed:

1. Subgingival to not violate the biological width.
2. Equigingival.
3. Supragingival.
4. Subgingival violates the biological width.
5. Subgingival to gain maximum axial retention.

Answer. 3. Supragingival.

Question 2. Over contoured crown is primarily the result of:

1. Trying to strengthen the restoration.
2. Gingival recession.
3. Faulty impressions.
4. Insufficient tooth reduction.
5. Faulty casts.

Answer. 4. Insufficient tooth reduction.

Question 3. Retention of a complete crown preparation is increased by:

1. Decreasing the area of cement under shear strain.
2. Decreasing the total preparation surface area.
3. Decreasing the taper.
4. Improving surface smoothness.
5. Decreasing the length of preparation.

Answer. 3. Decreasing the taper.

Question 4. What is the significance of bevelling a working cusp for a full veneer crown?

1. Enhances resistance to dislodgement by buccolingual forces.
2. Aids in seating the casting during cementation.
3. Relieves the stresses when the restoration is loaded by axial forces.
4. Provides space for the addition of metal in the area of heavy occlusal contact.
5. Enhances resistance to dislodgement by horizontal forces.

Answer. 4. Provides space for the addition of metal in the area of heavy occlusal contact.

Question 5. Which one of the following statements is correct in relation to extracoronal restoration?

1. Retention prevents dislodgment of restoration by force directed in an apical or oblique direction.
2. The essential element of retention is luting cement.
3. Crowns are retained in place by wedge retention.
4. Inlay and onlay restorations are retained in place by sleeve retention.
5. The essential element of retention is taper.

Answer. 5. The essential element of retention is taper.

Question 6. Which one of the following statements is correct about the principle of tooth preparation?

1. A small tooth with short walls provides better retention than a large tooth with short walls.
2. The recommended degree of taper for premolars is more than the anterior teeth.
3. The optimum degree of taper for anterior teeth is around 17–24 degrees.
4. The recommended degree of taper for a molar is less than an anterior tooth.
5. The optimum degree of taper for a premolar is around 5–10 degrees.

Answer. 2. The recommended degree of taper for premolars is more than the anterior teeth.

Question 7. Which one of the following statements is correct with respect to crown preparation?

1. The finish line of the preparation should be always located supragingivally.
2. The finish line should be always 1mm away from the alveolar crest.
3. The path of insertion should be always parallel to the long axis of the prepared tooth.
4. Knife edge is the choice of finish line on the lingual surface of lingually tilted lower molars
5. The knife edge finish line produces maximal destruction on tooth preparation.

Note: The finish line should be at least 2mm away from the alveolar bone crest.

Answer. 4. Knife edge is the choice of the finish line on the lingual surface of lingually tilted lower molars

Question 8. In which type of restoration preparation should all the angles and sharp edges be rounded and stress-bearing areas flattened at right angles to the direction of the load?

1. All ceramic.
2. Metal-ceramic.
3. All metal.
4. Metal-acrylic.
5. All acrylic.

Answer. 1. All ceramic.

Extended Matching Questions

Question 1. Theme: Tooth Preparation

A. Functional cusp bevel.

B. Seating groove.

C. Axial reduction.

D. Wing.

E. Gingival bevel.

F. Chamfer.

G. Shoulder.

Using a letter from A to G, choose the most appropriate procedure from the list above that best matches each of the following descriptions numbered 1–5 below. You may use each option once only or not at all.

1. Maintains marginal integrity and periodontal preservation.
2. Provides structural durability.
3. Provides retention, resistance, and structural durability.
4. Enhances retention and resistance.
5. Maintains marginal integrity.

 

Question 2. Theme: Finish Lines

A. Chamfer finish line.

B. Flare.

C. Radial shoulder finish line.

D. Knife edge.

E. Deep knife edge.

F. Occlusal shoulder.

G. Chamfer with bevel.

Using a letter from A to G, choose the most appropriate code from the list above that best matches each of the following descriptions numbered 1–5 below. You may use each option once only or not at all.

1. Indicated for lingually tipped lower molars.
2. Indicated for metal restorations without inclinations.
3. Indicated for porcelain restorations.
4. Indicated on the functional cusp of onlay.
5. Indicated on the walls of a proximal box of onlay.

Short Answer Questions

Question 1. You are preparing a mandibular molar FDI 36 to receive a full gold crown restoration. What are the possible consequences of the following errors:

1. Occlusal morphology during occlusal reduction is not maintained.

Adequate thickness of the material will not be there – heavy contact – leading to perforation

2. Excessive axial reduction.

• Destructive tooth preparation
• Lead to pulpal exposure.

3. No definitive finish line.

The thin casting margin is more susceptible to distortion, leading to microleakage and secondary caries.

Overcontoured restorations – this affects periodontal health.

Question 2. You are preparing a mandibular molar FDI 36 to receive a full gold crown restoration. What are the possible consequences of the following errors:

1. If the functional cusps are not beveled.

• Extremely thin casting leads to deformation of the restoration
• Overcontoured casting with deflective occlusal contacts
• If the preparation is tapered to compensate, it will lead to unnecessary destruction of tooth structure and loss of retention.

2. Inadequate axial reduction.

• Thin restoration leads to deformation of the restoration
• Overcontoured restoration leads to disastrous effects on periodontium.

Question 3. You are preparing a mandibular molar FDI 36 to receive a full gold crown restoration.

1. Explain the retention and resistance form in the crown preparation.

• Retention prevents removal of the restoration along the path of insertion or the long axis of the tooth preparation
• Resistance prevents dislodgement of the restoration by forces directed in an apical or oblique direction and prevents any movement of the restoration under occlusal forces.

2. List any three features that affect the retention and resistance form.

• Taper
• Freedom of displacement
• Length
• Substitution of internal features
• Path of insertion.

Question 4. Which one of the following preparations on lower molar is correct? Discuss why the others are not correct.

• Correct – functional cusp bevel – adequate thickness of material.
• Incorrect – basic inclined plane pattern to be maintained.
• Incorrect – Functional cusp bevel is not present.

Question 5. Explain how to survey the preparation visually.

• Extraoral: One eye – a distance of approximately 30 cm [12 inches].
• Intraoral: Single crowns – mouth mirror held at an angle approximately ½ inch above the preparation – viewed with one eye.
• Bridges: Firm finger rest – centered over one preparation and check for the other abutment preparation by pivoting on the same finger rest.

Question 6. List the five principles that govern the design and execution of a crown/cast restoration.

• Preservation of tooth structure.
• Retention and resistance.
• Structural durability.
• Marginal integrity.
• Preservation of the peridontium.

Question 7. How retention of a preparation can be increased (at least two methods)?

• Taper – more parallel walls
• Freedom of displacement – reduced
• Preserving the length of the preparation
• Limiting the path of insertion
• Adding internal features.

Question 8. How do you prepare a radial shoulder finish line?

Flat end tapered diamond; rounded internal line angle is done by end-cutting parallel-sided carbide finishing bur, specially modified bin-angle chisel, or radial fissure bur.

Fill in the blanks

Question 1. Fill the blanks.

1. Risk of marginal distortion is higher in ______________ finish line.

Answer. knife edge

2. Risk of overcontouring is higher in ______________ finish line.

Answer. knife edge

3. The preferred finish line for full ceramic crown preparation is ______________.

Answer. radial shoulder

2. Fill the following blanks with the name of the finish line shown on each picture.

1. ______________

Answer. Chamfer

2. ______________

Answer. Shoulder

3. ______________

Answer. Radial shoulder

4. ______________

Answer. Shoulder with bevel

Full Coverage Restorations

Multiple Choice Questions

Question 1. Occlusal clearance in a prepared tooth is best assessed by:

1. Visual examination.
2. Metal gauge.
3. Articulating paper.
4. Wax bite.
5. Bite registration paste.

Answer. 4. Wax bite.

Question 2. The role of seating groove in a crown preparation is to provide:

1. Resistance and retention form.
2. Structural durability to the crown.
3. Marginal integrity and periodontal preservation.
4. Structural durability to the tooth.
5. Preservation of tooth structure.

Answer. 1. Resistance and retention form.

Question 3. The preferred finish line for a full-metal gold crown is a knife edge:

1. Shoulder.
2. Radial shoulder.
3. Chamfer.
4. Deep chamfer.

Answer. 3. Chamfer.

Question 4. A full-coverage crown restoration has the advantage over a partial veneer restoration because the full-crown restoration:

1. Preserves tooth structure.
2. Has more cleansable margins.
3. Allows for better retention.
4. Is associated with less periodontal irritation.
5. Results in fewer pulpal problems.

Answer. 3. Allows for better retention.

Question 5. What is the possible consequence of the preparation of the labial surface of anterior teeth in one plane?

1. Compromising oral hygiene.
2. Compromising occlusion.
3. Compromising esthetics.
4. Compromising speech.
5. Compromising marginal integrity.

Answer. 3. Compromising esthetics.

Question 6. Which one of the following statements about properties of full-crown restorations is correct?

1. Most accurate fit: Full metal = metal–ceramic > full ceramic.
2. Most esthetic: Full ceramic = metal–ceramic > full metal.
3. Maximum tooth conservation: Full ceramic > metal–ceramic = full metal.
4. Most brittle: Metal–ceramic > full ceramic > full metal.
5. Better marginal integrity: Full ceramic > metal–ceramic = full metal.

Answer. 1. Most accurate fit: Full metal = metal-ceramic > full ceramic.

Extended Matching Questions

Question 1. Theme: Crown preparation

A. Chamfer finish line.

B. Cingulum reduction of anterior tooth.

C. Shoulder finish line.

D. Relieving the proximal contact.

E. Occlusal surface reduction.

F. Shoulder bevel.

G. Occlusal flare.

Using a letter from A to G, choose the most appropriate response from the list above that best matches each of the following descriptions numbered 1–5 below. You may use each response A–G, once only or not at all.

1. Established using a torpedo diamond bur.
2. Established using a flat-end tapered diamond bur.
3. Established using a round-end tapered diamond bur.
4. Established using a short needle diamond bur.
5. Established using a wheel diamond.

Question 2. Theme: Crown preparation

A. Marginal integrity.

B. Periodontal preservation and structural durability.

C. Retention, resistance, and preservation of tooth structure.

D. Structural durability.

E. Structural durability.

F. Retention, resistance, and structural durability.

G. Marginal integrity and periodontal preservation.

The diagram illustrates the preparation for posterior porcelain fused to a metal crown. Match the name of the features with their function and location on the diagram.

 

1. Chamfer.
2. Functional cusp bevel.
3. Wing.
4. Radial shoulder.
5. Axial reduction.

Question 3. Theme: Crown preparation

A. Periodontal preservation and structural durability.

B. Retention, resistance, and preservation of tooth structure.

C. Structural durability.

D. Structural durability.

E. Structural durability.

F. Retention, resistance, and structural durability.

G. Marginal integrity and periodontal preservation.

The above diagram illustrates the preparation for anterior porcelain fused to a metal crown. Match the name of the features with their function and location on the diagram.

1. Chamfer.
2. Incisal notch.
3. Wing.
4. Radial shoulder.
5. Axial reduction.

Question 4. Theme: Crown preparation

A. Marginal integrity, structural durability, periodontal preservation, and resistance

B. Retention, resistance, and structural durability.

C. Structural durability.

D. Structural durability.

E. Structural durability.

F. Retention and resistance.

The above diagram illustrates the preparation for an anterior full porcelain (all ceramic) crown. Match the name of the features with their function and location on the diagram

1. Radial shoulder (round shoulder).
2. Axial reduction.
3. Incisal reduction.
4. Cingulum reduction.
5. Vertical lingual reduction.

Short Answer Questions

Question 1. Explain the type of occlusal, buccal, and lingual preparation for porcelain-fused-to-metal (with metal backing) crown preparation on posterior teeth mentioning the depth of the preparation, type of finishing line, and type of bur required for each part:

• Occlusal: 2 mm reduction on functional cusp (1.5 mm + 0.5 occlusal bevel) and 1.5 non-functional cusps using round end tapered bur.
• Buccal reduction: 1.2–1.4 mm axial reduction with radial shoulder finishing line using flat and tapered bur followed by modified chisel.
• Lingual reduction: 0.7 mm axial reduction with chamfer using torpedo bur.

Question 2. What type of finish line is most suitable for a full-ceramic crown and why?

Radial shoulder (round shoulder).

Question 3. Where the finishing line ideally should be prepared on a posterior tooth in relation to the gingival margin?

1 mm above the gingival margin. Because it is more hygienic (it is in a self-cleaning area and will not retain plaque close to the gingival margin).

Question 4. What are the possible consequences of preparing the labial surface of the central incisor in one plane (at least two points)?

Extension of gingival plane: Bad shade match, over-contoured

Extension of incisal plane: Over-tapered and may encroach the pulp.

Fill in the blanks

Question 1. On the following schematic picture fill in the blanks using the given options.

Question 1.1. Which type of crown is this tooth prepared for: (refer to the picture)

1. Full ceramic.
2. Full metal–ceramic.
3. Full metal.
4. Partial metal.
5. Partial metal-ceramic.

Answer. 3. Full metal.

Question 1.2. The type of finish line is ___________which is prepared by__________ bur.

1. Chamfer, round end tapered.
2. Shoulder, torpedo.
3. Radial shoulder, flat end tapered.
4. Chamfer, torpedo.
5. Radial shoulder, radial fissure.

Answer. 4. Chamfer, torpedo.

Question 1.3. The role of seating groove in crown preparation is to provide ____________

1. Resistance and retention.
2. Structural durability.
3. Marginal integrity and periodontal preservation.
4. Strength.
5. Preservation of tooth structure.

Answer. 1. Resistance and retention.

Question 2. On the following schematic picture fill in the blanks using the given options:

Question 2.1. Identify the type of labial finish line on the diagram below:

1. Chamfer.
2. Round edge.
3. Shoulder.
4. Deep chamfer.
5. Knife edge.

Answer. 3. Shoulder.

Question 2.2. The above preparation is made for ____________crown.

1. Full ceramic.
2. Full metal-ceramic.
3. Full metal.
4. Partial metal.
5. Partial metal-ceramic.

Answer. 1. Full ceramic.

Question 2.3. The type of finish line is __________ which is prepared by __________ bur.

1. Chamfer, round end tapered.
2. Shoulder, torpedo, and radial fissure.
3. Radial shoulder, flat end tapered, and radial fissure.
4. Chamfer, torpedo.
5. Knife edge, long needle.

Answer. 3. Radial shoulder, flat end tapered and radial fissure.