esthetics

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emm64
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276334
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esthetics
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2014-06-07 13:09:51
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esthetics
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  1. 32. Enamel microabrasion utilizes:
    • a. Hydrochloric acid  Enamel
    • b. Phosphoric acid  Resin-Dentin Bond
    • c. Hydrofluoric acid Resin Adhesive Ceramic & Resin-Enamel
    • d. Polyacrylic acid  GI Cement






    a
  2. 1. Resin-enamel bonding utilizes:
    • a. Hydrochloric acid
    • b. Phosphoric acid
    • c. Hydrofluoric acid
    • d. Polyacrylic acid
    •   









    c
  3. 2. Prior to placement of adhesive resin materials, enamel on permanent teeth should etched for:
    • a. 5-10 seconds
    • b. 15-20 seconds
    • c. 45-60 seconds






    b
  4. 3. Acid etching of enamel to achieve resin bonding is unnecessary for cavities prepared with the air abrasion technique. T F
    F
  5. 4. Acid conditioning (acid “etching”) of dentin reduces dentin permeability. T F
    F
  6. 5. Dentin primers can be generally descrbied as hydrophobic resins. T F
    T
  7. 6. In resin adhesion to dentin, the Hybrid Layer consists of:
    • a. Resin and hydroxyapatite
    • b. Resin and inorganic filler
    • c. Resin and collagen
    • d. Resin and odontoblasts








    B
  8. 7. Resin-dentin bonding utilizes:
    • a. Hydrochloric acid
    • b. Phosphoric acid
    • c. Hydrofluoric acid
    • d. Polyacrylic acid







    B
  9. 8. Esthetic Dentistry is a sub-specialty of Restorative Dentistry. T F
    T
  10. 9. An esthetic evaluation questionnaire should be part of the data gathering process to identify the patient’s concerns. T F
    T
  11. 10. Photographs are useful as both laboratory communication tools and documentation in the patient record. T F
    T
  12. 11. The purpose of a diagnostic waxup is to make your instructor happy – it is otherwise a waste of time. T F
    F
  13. 12. Light curing is optional when using a dual-cure resin cement. T F
  14. 13. Light-cure resin cements have (more, less, equivalent) color stability as compared to dual-cure resin cements. (Circle correct answer.)
    F
  15. 14. Hybrid composite resins, due to their higher filler content, have better physical properties than microfill composites. T F
    T
  16. 15. The appropriate resin cement variety for placement of ceramic onlays is:
    • a. Light-cure
    • b. Dual-cure
    • c. Self-cure






    B
  17. 16. Unlike the resin and filler in composite resins, the components of glass ionomer cements chemically react with each other upon mixing. T F
    T
  18. 17. Glass ionomer cements adhere to tooth structure via micromechanical attachment. T F
    F
  19. 18. Fluoride release from resin-modified glass ionomer materials is roughly equal to that of composite resins. T F
    F
  20. 19. Resin-modified glass ionomers are not suitable for use in stress-bearing areas. T F
    T
  21. 20. Adhesion of glass ionomer cement to tooth structure is achieved utilizing:
    • a. Hydrochloric acid
    • b. Phosphoric acid
    • c. Hydrofluoric acid
    • d. Polyacrylic acid








    D
  22. 21. Home bleaching has no effect on tetracycline stained teeth. T F
  23. 22. The active bleaching agent in carbamide peroxide home bleaching products is:
    • a. Carbamide peroxide
    • b. Carbonic acid
    • c. Hydrogen peroxide
    • d. Urea peroxide








    C
  24. 23. Sensitivity of the teeth is the most common side effect of home bleaching. T F
    T
  25. 24. Home bleaching trays are fabricated using a rigid vacuum-form material of 0.010” thickness. T F
    F (0.035” thick)
  26. 25. Proper bleaching tray design dictates trimming the tray edge such that it is:
    • a. ¼ mm away from the free gingival margin (along gingival margin!)
    • b. 1.5 mm away from the free gingival margin
    • c. 1.5 mm beyond the free gingival margin




    A
  27. 26. The tooth whitening effect produced by the home bleaching procedure occurs via oxidation of pigmented organic compounds in the enamel matrix. T F
    • T
    • ***Carbamide Phosphate only does enamel, but once broken down to H2O2 does both enamel and dentin!
  28. 27. The typical treatment time required to achieve maximum whitening with home bleaching is 4-5 days. T F
    F  (3-6 weeks)
  29. 28. Proper treatment sequencing dictates that home bleaching is deferred until definitive restorative procedures such as crowns and veneers are completed. T F
    F
  30. 29. Esthetic tooth contouring is performed using local anesthetic to prevent patient discomfort. T F
    F
  31. 30. Porcelain polishing points are useful for polishing enamel. T F
    F
  32. 31. Following esthetic tooth contouring via enameloplasty, the involved teeth must be restored to prevent fracture of the weakened enamel. T F
    F
  33. 33. Use of a rubber dam during enamel microabrasion is optional for maxillary anterior teeth but required in other areas of the mouth. T F
    F
  34. 34. Enamel microabrasion is indicated for removal of extrinsic stains caused by coffee, tea, and tobacco use. T F
    T
  35. 35. Glass ceramics are less abrasive to opposing enamel than feldspathic porcelains. T F
    T
  36. 36. Glass ceramics have better optical properties than feldspathic porcelain. T F
    F
  37. 37. Glass ceramics are usually fabricated using the refractory die technique. T F
    • F
    • ***done by lost-wax technique (refract die and platinum foil technique are done for feldspathic porcelain)
  38. 38. Aluminous porcelain is used as a core material for porcelain jacket crowns. T F
    • T
    • ***Metal alloys are used as coping for PFM’s, but for Porcelain Jacket Crowns, the core material is Aluminous Porcelain!
  39. 39. The minimum pulpal depth required in a ceramic inlay preparation is:
    • a. 1 mm
    • b. 2 mm
    • c. 3 mm




    B
  40. 40. Proximal margins of ceramic inlay preparations should be beveled to increase surface area for bonding. T F
    F
  41. 41. Silane coupling agents:
    • a. improve the adhesion of resin cements to ceramic restoration surfaces.
    • b. are bifunctional molecules.
    • c. are hydrophilic.
    • d. all of the above.









    D
  42. 42. Resin cement must be completely removed from ceramic inlay margins prior to light curing. T F
    F
  43. 43. Occlusal adjustment of a bonded ceramic restoration is done with a:
    • a. Finishing diamond
    • b. Green stone
    • c. 12-fluted carbide bur
    • d. 30-fluted carbide bur













    A
  44. 44. Porcelain veneers are indicated for restoration of anterior guidance in heavy bruxers. T F
    F
  45. 45. Mounted diagnostic casts are required only for those porcelain veneer cases involving minor tooth malpositions. T F
    F
  46. 46. According to the “Golden Proportion,” the maxillary canine should appear ________ the lateral incisor when viewed from the front.
    • a. approximately 60% wider than
    • b. approximately 30% wider than
    • c. approximately 60% narrower than
    • d. equal in mesiodistal width to






    C
  47. 47. The clinical crown of a maxillary central incisor has a more pleasing appearance when:
    • a. its length = its witdh.
    • b. its length > its width.
    • c. its length < its width.






    B
  48. 48. A direct mockup with composite resin is a useful technique for allowing patients to “preview” final results of esthetic treatments. T F
    T
  49. 49. Replacement of existing restorations on teeth receiving porcelain veneers should be completed:
    • a. prior to preparations for the veneers
    • b. during the veneer preparation procedure
    • c. during the veneer cementation procedure





    A
  50. 50. Facial depth cuts for porcelain veneer preparations are placed:
    • a. after placement of the mesial and distal proximal margins
    • b. prior to placement of the gingival chamfer
    • c. after placement of the lingual chamfer






    B
  51. 51. The most commonly used incisal finish line design for porcelain veneer preparations is a butt joint margin at the facioincisal line angle. T F
    F
  52. 52. The dual-grit chamfer diamonds designed for porcelain veneer preparations cost approximately three times as much as standard diamonds. T F
    T
  53. 53. For porcelain veneer final impressions, all lingual surfaces of prepared teeth should be covered with soft utility wax to prevent entrapment of impression material in gingival embrasures. T F
    F
  54. 54. New composite resin systems such as Vitalessence utilize highly translucent enamel shades to help reproduce natural tooth esthetics. T F
    T
  55. 55. Wear resistance of a Class I or Class II composite restoration can be improved by hardening the surface via burnishing. T F
    F
  56. 56. According to clinical studies, what is the primary factor in determining the longevity of a Class I or Class II direct composite restoration?
    • a. type of dentin bonding procedure used
    • b. the size of the restoration outline
    • c. physical properties of the composite restorative material
    • d. use of rubber dam isolation
    • e. the opposing cusp contact








    C
  57. 57. Recurrent caries in Class II composites most commonly occurs at:
    • a. the occlusal margins.
    • b. the buccal or lingual proximal margins.
    • c. the gingival margin.
    • d. at all margins with equal frequency.







    C
  58. 58. A Tofflemire matrix is appropriate for Class II composite restorations if it is used with the prewedging technique. T F
  59. 59. The “closed sandwich” technique for Class I and Class II compositves utilizes:
    • a. conventional hybrid composite and flowable composite.
    • b. conventional hybrid composite and resin-modified glass ionomer.
    • c. conventional hybrid composite and self-cure glass ionomer.
    • d. conventional hybrid composite and dual-cure resin cement.
    • e. b and c
  60. 60. Advantages of the “closed sandwich” technique for Class II composite restorations include:
    • a. improved retention.
    • b. reduced incidence of post-operative sensitivity.
    • c. better seal at gingival margins coronal to the CEJ.
    • d. b and c.
    • e. all of the above.

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