AFK Quiz – Prostho Occlusion

AFK Quiz - Prostho Occlusion

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1. A 36-year-old patient sustains a fracture of the incisal edge of her crown on tooth 1.1. The crown is a zirconia-based ceramic and was placed 2 years ago. The most likely etiology is

a. short clinical crown of tooth 1.1.

b. fracture of zirconia substructure.

c. fracture of porcelain overlay.

d. failure of cement.

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2. In a balanced occlusion scheme, an increase in horizontal overlap produces

a. more vertical component to mandibular movement.

b. a flatter inclination of the occlusal plane.

c. a decreased anterior guidance angle.

d. steeper posterior cusps

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3. In practice, which of the following color aspects does not play a significant role in color matching dental restorations?

a. Metamerism

b. Fluorescence

c. Opalescence

d. Shade saturation

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4. What is the most appropriate management of talon cusp in cases of occlusal interference?

a. Observation

b. Cusp removal

c. Endodontic therapy

d. Tooth extraction

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5. A full metal crown is planned on tooth 1.7 which has a short clinical crown. To improve the resistance and retention of the final crown, a seating groove should be placed on which surface?

a. Proximal

b. Buccal

c. Palatal

d. Occlusal

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6. Which of the following is difficult to accomplish with extrinsic characterization of metal ceramic restorations?

a. Increasing chroma

b. Changing hue

c. Decreasing value

d. Increasing value

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7. Which of the following is a disadvantage of using an elastomeric material for making an interocclusal registration?

a. The material offers too much resistance to the jaw closure.

b. The fragility of elastomeric records requires handing with extreme care.

c. The inability to check the repeatability of the recorded mandibular position.

d. The material lacks adequate long-term stability.

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8. In fabrication of a complete denture, the main factor/s that dictate the position of anterior teeth is/are

a. condylar guidance.

b. denture function and stability.

c. phonetic and esthetic.

d. the compensating curve.

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9. The Bennett angle is the angle formed by the sagittal plane and the path of the

a. non-working condyle during lateral movement of the mandible.

b. Working condyle during lateral movement of the mandible.

c. non-working condyle during protrusive movement of the mandible.

d. Working condyle during protrusive movement of the mandible.

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10. During shade selection for an anterior zirconia crown, if it is not possible to achieve a close match with a shade guide,

a. a lighter shade should be selected as it can be stained more easily to a lower value.

b. a lighter shade should be selected as it can be stained more easily to a higher value.

c. a darker shade should be selected as it can be stained more easily to a lower value.

d. a darker shade should be selected as it can be stained more easily to a higher value.

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11. Which one is not among the functions of rest in a removable partial denture?

a. To prevent extrusion of abutment teeth.

b. To provide positive reference seats in rebase procedures.

c. To direct forces along the long axis of the abutment tooth.

d. Maintain a path of insertion via contact with guiding planes.

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12. During the cementation of a casting gold onlay on tooth 3.5 with zinc phosphate cement, the finishing of the margins should be

a. started as soon as the restoration is well seated.

b. started after the initial setting of the cement.

c. started after the final setting of the cement.

d. delayed for at least 1 to 2 days after the delivery of the onlay.

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13. Which of the following is true regarding use of polyvinyl siloxane impression material in complete denture construction?

a. Custom trays are recommended to obtain a uniform thickness of material.

b. Custom trays are recommended to allow for more uniform setting of the material.

c. Custom trays are not recommended due to the favorable properties of the material.

d. Custom trays are not recommended to facilitate removal of the impression.

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14. Which of the following is the main advantage of wrought gold alloy clasps to the cast gold clasps with the same cross section?

a. More flexibility

b. More accurate adaptation to the tooth

c. More resistance to corrosion

d. Higher modulus of elasticity

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15. A patient complains from a loose lower denture when she moves her tongue to the sides. The most likely reason is

a. occlusal interferences.

b. overextended lingual flanges.

c. overextended buccal flanges.

d. very thick buccal and lingual flanges.

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16. Monolithic Zirconia is superior to leucite and lithium disilicate because zirconia has higher

a. translucency.

b. esthetic.

c. fracture resistance.

d. bond strength to the tooth structure.

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17. During the try-in of a PFM crown on tooth 2.1, the patient complains of darkness of the gingival third of the crown. What is the most likely reason?

a. Error in shade selection.

b. Inadequate framework design.

c. Excessive value of the porcelain.

d. Excessive chromium content of the metal framework.

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18. In an I-bar clasp assembly, the I-bar retentive arm is usually positioned at

a. gingival one third and mesial undercut of abutment.

b. gingival one third and distal undercut of abutment.

c. middle one third and mesial undercut of abutment.

d. middle one third and distal undercut of abutment.

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19. Using a lingualized occlusal scheme for fabrication of complete denture, the centric position contacts are set maxillary palatal cusp to

a. fossae of the mandibular posterior teeth.

b. Buccal inclination of buccal cusp of the mandibular posterior teeth.

c. Lingual inclination of the buccal cusp of the mandibular posterior teeth.

d. Buccal inclination of the lingual cusp of the mandibular posterior teeth.

e. Lingual inclination of the lingual cusp of the mandibular posterior teeth.

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20. The main aim of phonetic tests at the wax rim stage and jaw relation records in complete dentures fabrication is recording

a. centric relation

b. vertical dimension of occlusion

c. adequate lip support.

d. flange extension.

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21. When making a polysulfide impression for a casting crown, custom trays are preferred over stock trays for all the following reasons, except

a. Custom trays facilitate uniform contraction of the impression material.

b. Impressions made in custom tray are easier to remove from the mouth.

c. Stock trays may be short in the flange area.

d. Custom trays require less impression material.

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22. What is the most appropriate method to prevent gingival irritation by the lingual bar of a lower removable partial denture?

a. Using a smaller size for the lingual bar

b. Ensuring maximum occlusal forces distribution

c. Providing relief between the lingual bar and the gingiva

d. Blocking out the undercut next to the edentulous ridge

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23. A 45-year-old patient presents with a chipped incisal edge of the PFM crown on tooth 1.1, which is the abutment for a 3-unit bridge (1.1-1.3). The bridge is otherwise acceptable, and patient has the fractured porcelain. The most appropriate management is to

a. bond the fractured piece with a porcelain repair system.

b. repair the broken piece with composite resin and a silane coupling agent.

c. cut the bridge from the connector and make a new crown on tooth 1.1.

d. make a new bridge.

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24. A 22-year-old healthy patient is having a non-surgical endodontic treatment on tooth 1.1 due to devitalization following a blow to the tooth. Tooth has no previous restoration. What is the most appropriate definitive restoration after root canal treatment?

a. Lingual composite restoration

b. Intracanal post and composite restoration

c. Composite restoration and full ceramic crown coverage

d. Post and core build up and full ceramic crown coverage

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25. If a patient wears an upper complete denture and has only the lower anterior teeth present, but refuses to wear a lower partial denture, the most likely outcome is

a. excessive wear of the upper denture.

b. excessive bone loss in the posterior maxilla.

c. overeruption of lower incisors.

d. decreased retention of the upper denture.

e. increased risk of epulis fissuratum in mandible.

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26. In an ideal centric occlusion, the mesiolingual cusp of tooth 2.7 occludes in the

a. central fossa of 3.6.

b. central fossa of 3.7.

c. mesial marginal ridge of 3.7.

d. distal marginal ridge of 3.7.

e. mesial marginal ridge of 3.8.

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27. Antero-posteriorly, what is the direction of bone resorption in maxilla and mandible?

a. the maxilla resorbs in a superior and anterior direction, the mandible in an inferior and posterior direction.

b. the maxilla resorbs in a superior and posterior direction, the mandible in an inferior and anterior direction.

c. the maxilla resorbs in an inferior and posterior direction, the mandible in an inferior and posterior direction.

d. the maxilla resorbs in an inferior and anterior direction, the mandible in an inferior and anterior direction.

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28. What is the first step in surveying a diagnostic cast for a removable partial denture case?

a. Determining the guiding planes

b. Determining the retentive areas

c. Eliminating the interferences

d. Tooth contour modification

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29. A 75-year-old patient recently received complete upper and lower dentures. He is satisfied with the overall retention of the dentures, but his chief complaint is that his upper denture dislodges when he makes extreme lateral excursion. What is the most likely etiology?

a. Buccal/labial frenum impingement

b. Insufficient posterior palatal seal

c. Inadequate extension of flanges

d. Coronoid process interference

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30. What is the most common etiology of a flabby ridge in the anterior part of maxilla?

a. Ill-fitting dentures.

b. Over extended flanges.

c. Poor oral hygiene and wearing dentures at nights.

d. When there are remaining anterior teeth in the mandible.

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31. Which of the following structures are not covered by the retromolar pad?

a. fibers of buccinator muscle

b. fibers of superior constrictor muscle

c. fibers of ptergomandibular raphe

d. fibers of medial pterygoid muscle

e. terminal part of the tendon of temporalis muscle

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32. A patient wearing complete dentures with inadequate occlusal vertical dimension may have

a. rapid bone resorption.

b. fatigue when chewing.

c. sore spots on the tissue bearing surfaces.

d. clicking of denture tooth contact during speech.

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33. Which of the following options is wrong regarding anterior-posterior palatal strap-type major connector for a removable partial denture?

a. The anterior component should not cover rugae.

b. The posterior strap minimum width is 8 mm.

c. The posterior strap should be located entirely on the hard palate.

d. The posterior strap should be located diagonally to midline.

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34. A 53-year-old healthy patient presents to replace missing tooth 2.2. Tooth was extracted 6 months ago due to a failed root canal treatment. Patient is not interested in a dental implant. She has class II, division 2 malocclusion. What is the most appropriate way to replace tooth 2.2?

a. A PFM bridge from tooth 2.1 to tooth 2.3.

b. A Maryland bridge from tooth 2.1 to tooth 2.3.

c. A zirconia bridge from tooth 2.1 to tooth 2.3.

d. A full ceramic (felspathic porcelain) cantilever bridge with tooth 2.3 as the abutment.

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35. An 87-year-old recently received a new set of complete dentures. She would find it hardest to adjust with the pronunciation of which sound?

a. V and F

b. S and T

c. B and P

d. M and N

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36. To overcome the problem of parallelism, which of the following can be used during the fabrication of a dental fixed bridge?

a. Cast connectors.

b. Soldered connectors.

c. Welded connectors.

d. Non-rigid connectors.

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37. When all other removable partial denture consideration remains unchanged, clasps constructed of which material can be engage the deepest undercut?

a. Chrome cobalt casts

b. Nickel chrome casts

c. Wrought stainless steel

d. Wrought gold

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38. Relining a distal extension base of a removable cast framework partial denture can improve all the following, except

a. Occlusion.

b. Function.

c. Tissue adaptation.

d. Fit of the framework.

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39. Which part of a semi-adjustable articular is magnetically retained to lock the upper and lower frames together during the cast framing procedure?

a. Support pin

b. Incisal table

c. Centric latch

d. Mounting knob

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40. In the VITA classical shade guide system which color is the lightest shade?

a. A1

b. B1

c. C1

d. D1

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41. Which of the following does NOT result in complete denture staining?

a. Improper denture care and cleaning.

b. Using heat-activated resins to fabricate denture base.

c. Remaining deep scratches over denture base before polishing.

d. Inadequate pressure during flask closure.

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42. Which of the following restorations has a higher translucency and is more appropriate for crown restoration in the anterior sextant?

a. 3Y-zirconia.

b. 4Y-zirconia.

c. 5Y-zirconia.

d. Porcelain fused to metal.

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43. A 65-year-old patient with missing lower premolars and molars on the right side presents for the delivery of his cast based lower partial denture. What is the main function of the rest on tooth 3.5? Providing resistance

a. to removal from the teeth.

b. to movement towards the tissues.

c. to movement anterior-posteriorly.

d. to movement medio-laterally.

e. against rotational displacement.

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44. In a PFM bridge, the pontic design should

a. control thermal conductivity

b. place the porcelain metal joint away the soft tissues.**

c. allow for complete coverage of the metal by the porcelain.

d. have a concave gingival surface to prevent food impaction.

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45. The function served by functional cusp bevel in a mandibular full metal crown preparation is

a. marginal integrity.

b. structural durability.

c. resistance and retention.

d. preservation of tooth structure

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46. In wrought alloys, the fibrous structure is responsible for

a. increased hardness.

b. increased ductility.

c. decreased proportional limit.

d. decreased modulus of elasticity.

e. recrystallization.

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47. The ideal axial convergence for a full metal crown preparation should be

a. 3° - 5°

b. 6° - 10°

c. 10° - 20°

d. 20° - 25°

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48. The physiologic rest position in complete denture is useful to the determination of

a. condylar guidance.

b. cusp inclinations.

c. vertical dimension of occlusion.

d. Level of occlusal plane.

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49. The most important factor in shade matching for a zirconia crown is

a. Hue

b. Value

c. Chroma

d. Translucency

e. Opacity

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50. A 66-year-old patient recently received a set of complete dentures. He complains of occasional cheek biting when eats. What is the most likely reason?

a. Increased Freeway Space

b. Increased vertical dimension

c. Reduced Vertical Overlap of Posterior Teeth

d. Reduced Horizontal Overlap of Posterior Teeth

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51. Full metal crown preparation on which of the following teeth has the lowest resistance form?

a. 1.4.

b. 4.4.

c. 4.6.

d. 3.3.

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52. The framework of a resin-bonded fixed dental prosthesis is usually made of

a. Type IV gold alloy.

b. Chromium-Cobalt alloy.

c. Nickel-chromium alloy.

d. Type II gold alloy.

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53. The Bennett angle is the angle formed by the

a. axial plane and the path of the working condyle during lateral movement of mandible.

b. axial plane and the path of the non-working condyle during lateral movement of mandible.

c. sagittal plane and the path of the working condyle during lateral movement of mandible.

d. sagittal plane and the path of the non-working condyle during lateral movement of mandible.

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54. A 70-year-old patient with full edentulous maxilla opposing a natural lower dentition presents for the delivery of a new upper full denture with acrylic teeth. You should inform the patient that

a. the upper denture teeth will wear at a lower rate.

b. there is an increased risk for abrasion of the lower natural teeth.

c. the chance of fracture of the upper denture is higher.

d. the retention of the upper denture will be lower.

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55. Which of the following sounds is used to determine the position of the incisal edge of the maxillary incisors?

a. Bilabial sounds

b. Fricative sounds

c. Linguoalveolar sounds

d. Linguopalatal sounds

e. Linguodental sounds

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56. Which one is not among the consequences of inadequate ferrule?

a. Crown fracture

b. Cement failure

c. Post loosening

d. Root fracture

e. Post fracture

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57. A 64-year-old patient presents with missing upper right molars and missing premolars and molars on the left side. He is interested in replacing them with a removable partial denture. What is the most advantageous tooth for placing the indirect retainer?

a. 1.3

b. 2.3

c. 1.4

d. 2.4

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58. Adding more water for mixing plaster of Paris will result in set plaster that exhibits

a. decreased expansion and decreased strength.

b. decreased expansion and increased strength.

c. increased expansion and decreased strength.

d. increased expansion and increased strength.

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59. Opening the proximal contacts during teeth preparation for porcelain veneers helps with all the following, except

a. easier impression taking.

b. facilitating the sectioning of dies.

c. improved veneer strength in the interproximal areas.

d. more predictable reproducing the finish line in scanning.

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60. A complete denture wearer patient complains of poor retention of his upper denture. The denture was made 8 years ago. You decide to reline the denture. Shortly after the delivery of the relined denture, patient states that the retention improved but he complains of speech difficulties. You notice that there is an increase in the overbite. What is the most likely reason?

a. Excessive pressure over posterior teeth during the reline.

b. Excessive pressure over anterior teeth during the reline.

c. Inadequate polymerization of the reline material.

d. Inaccurate centric relationship.

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61. In an ideal centric occlusion, the mesiolingual cusp of tooth 2.7 occludes in

a. central fossa of tooth 3.6.

b. central fossa of tooth 3.7.

c. mesial marginal ridge of tooth 3.7.

d. distal marginal ridge of tooth 3.7.

e. mesial marginal ridge of tooth 3.8.

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62. What is the recommended amount of occlusal reduction for an all ceramic onlay preparation on tooth 1.5?

a. 1 mm

b. 1.5 mm

c. 2 mm

d. 2.5 mm

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63. Which of the following cannot be determined by survey analysis of a partially edentulous cast?

a. The optimal path of insertion.

b. The retention potential of the abutment teeth.

c. The depth of the rest seat for the indirect retainers.

d. The modification needed to create parallel guiding planes.

e. The location of the height of contour of the abutment teeth.

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