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2012-12-10 18:22:42
Indirect Fall 2012 Quizzes

Indirect Fall 2012 Quizzes
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  1. 1) What is used to accurately affix a maxillary full arch cast to the articulator?
    none of the above; the facebow!
  2. 2) When mounting casts to restore a small part of the occlusion, the casts should usually be mounted in what position?
    maximal intercuspation is used to restore a small portion of occlusion, such as 1-2 crowns; for larger portions, use centric relation (ie, retruded position)
  3. 3) (T/F) When using a bite registration record to mount casts in maximum intercuspation, the part of the record touching soft tissue should be used to stabilize the record on the cast:
    F; all you want is the occlusal, and not even the whole occlusal- just the cusp tips
  4. 1) Criteria for a good occlusal record include all the following except:
    no flexibility
  5. 2) (T/F) When using polyvinyl siloxane material, the pt much always close into full intercuspal position bf the material starts to set:
  6. 3) All the following are captured in an acceptable double-bite impression except:
    none of the above; includes the prepped tooth, the adjacent teeth, the opposing teeth, and the occlusal relationship of maximum intercuspation
  7. 4) After taking a double-bite impression, what is the proper sequence of pouring & articulating?
    none of the above; A is wrong bc you never attach the 2nd opposing side to the articulator bf you open it
  8. 5) (T/F) The proper double-bite impression should have translucent areas on the occlusal of the impressions, corresponding w the intercuspation of adjacent opposing teeth:
  9. 1) When using a double-bite impression for a full crown on #30, at what point should the casts be removed from the impression?
    after both impressions are poured & both attached to the articulator
  10. 2) All of the following is a contra-indication for taking an impression using the double-bite impression method, except:
    PFM on #4 & 5 in a pt w stable occlusion
  11. 3) (T/F) Since the gold casting is no better than the wax casting from which it is made, the wax-up should be as polished & finished as possible before casting:
  12. 4) When waxing a crown using an indirect technique, which is the first step?
    making a thin wax coping
  13. 5) What should be done to before waxing to ensure there are adequate proximal contacts after polishing & finishing?
    • lightly scraping the stone off adjacent teeth
    • -mark the proximal contact area w a pencil, then scrape it off- do this a couple times, so that there is a little bit to polish; if the wax is exactly the same size as the casting, when you polish you’ll either have light or open contacts
    • -when there is wax on wax in adjacent prepared teeth, overcontour slightly
  14. 1) To check the marginal fit of a wax-up on the die, the wax-up should be viewed from what direction?
    apical/ gingival
  15. 2) (T/F) When completing a wax pattern for a crown, waxing the occlusal surface should be completed before the proximal surfaces:
  16. 3) Which of the following porcelain types is used to conceal the metal in a PFM restoration?
  17. 4) The melting range of the metal alloy should be ideally __ degrees Centigrade higher than the fusing temperature of the porcelain that overlays it, in a PFM restoration.
  18. 5) According to the text, the absolute minimum thickness of porcelain in a PFM restoration is:
    0.7 mm
  19. 1) Which porcelain type imparts translucency to the porcelain?
  20. 2) (T/F) When doing a cutback for a max posterior PFM restoration and it is desirable to keep the occlusion in metal, the porcelain cutback extends over the facial cusp & over half the lingual incline of the facial cusp:
  21. 3) Molten alloys shrink upon solidification after casting, when it cools. How much does gold alloy shrink?
  22. 4) What type of investment material is used when casting Types I, II, & III alloys?
  23. 5) When investing a wax pattern prior to burnout and casting, what is used to attach the pattern to the rubber crucible?
    sprue former
  24. 1) Using a lower water-powder ratio when investing will create more expansion.
  25. 2) When investing a wax pattern prior to casting, the highest point of the pattern should be 6-8 mm from the end of the ring. If the pattern is too far from the end of the ring:
    gasses in the mold may not be able to escape
  26. 3) After casting your crown & cleaning off all the remaining investment, you find that the casting has short, rounded margins and a rounded button. What was the problem?
    alloy wasn’t hot enough, or there was insufficient casting force
  27. 4) Each of the following needs to be done before seating the casting except:
    finishing & polishing the margins; not done until after verifying complete seating
  28. 5) (T/F) Most of the polishing & finishing of the margins of the casting should be done on the die, to protect the casting:
    F; doing this will abrade the die
  29. 1) After casting a crown & cleaning off remaining investment, you see porosities in the casting. These are likely due to:
    dirt/ debris in the wax pattern
  30. 2) (T/F) The external surface of the casting should be smooth and the transition from gold to tooth as uninterrupted as possible, bc plaque accumulation is directly related to the roughness of the surface:
  31. 3) When the pt complains of hypersensitivity with the provisional restoration, after a few days:
    check the provision, make sure its not in hyperocclusion, & recement it for a few days
  32. 4) When initially trying in the crown clinically that has been properly fit to die & adjusted on articulator, you see that the crown is not seated completely. What should be done first?
    check the interproximal contacts
  33. 5) (T/F) When trying a crown on the tooth for the first time, it is recommended that the pt bite on the crown to make sure it is seated completely:
    F; use finger pressure- if pt bites on the crown, you may not be able to get the crown off; the bite stick is used when cementing the crown
  34. 1) The best way to detect an open subgingival margin on the buccal or lingual surfaces of a full gold crown is a:
    sharp explorer (vs flossing, visually, radiographically)
  35. 2) (T/F) When trying in a crown for tooth #30, and you believe it is seated completely & the occlusion adjusted, you should check this by having the pt bite down on a Mylar strip on the left side of the mouth:
    F; should be used on the right side, the same side of the mouth the crown is located in
  36. 3) Dental waxes used to make extraoral patterns have what ADA classification?
    Type II
  37. 4) Which type of expansion is primarily relied upon in the high-temperature burnout technique, to compensate for the shrinkage of gold?
    thermal expansion (vs hygroscopic, setting, expansion of wax pattern)
  38. 5) The type of investment used to invest patterns for metal-ceramic restorations is:
    phosphate (vs gypsum, silicate, phosphorous)
  39. 1) Each of the following decrease distortion of the wax pattern,
    except: rapid carving of the wax; vs fast investing of pattern, uniform wax melting, storage at low temperature
  40. 2) (T/F) Increased spatulation time/ speed increases setting time and increases setting expansion
    : F; decreased setting time
  41. 3) (T/F) The most important thing in removing a permanently-cemented restoration, is safety to the restoration:
  42. 4) When removing a permanently-cemented PFM crown on #9, the initial sectioning groove is placed on which surface?
  43. 5) Each of the following internal features of a crown can present features to removing the crown, except:
    none of the above; boxes, pins, grooves, isthmus can all present problems in crown removal
  44. 1) When removing a permanently-cemented restoration, which of the following is least likely to be removed in one piece?
    MOD gold inlay; vs full gold crown, PFM, ¾ crown, 7/8 crown
  45. 2) Use of a rubber dam is recommended when removing which of the following restorations, when they need to be remade?
    all of the above; full-ceramic restorations, PFM crowns, full gold crowns
  46. 3) (T/F) Gold inlay castings have a coefficient of thermal expansion similar to natural teeth, do not oxidize or discolor teeth, and do not fracture at the cavosurface margins:
  47. 4) Disadvantages of conservative gold restorations include all the following except:
    they do not last as long as other restorations; may be more expensive than other restorations, are somewhat technique sensitive, may be esthetically unacceptable, requires more time to prepare than other restorations
  48. 5) After placing a rubber dam, what is the next step in a gold inlay preparation?
    removing old restoration & carious tooth structure; vs placing calcium hydroxide liner, placing resin blockup, occlusal outline form
  49. 1) (T/F) Because the wear rates and coefficient of thermal expansion of gold & tooth are similar, gold inlay cavosurface margins can be prepped without too much concern for wear of opposition dentition:
  50. 2) (T/F) Proper design of a gold inlay preparation can minimize display of gold
    : T
  51. 3) The interproximal finish line of the gingival floor in the box of an inlay is prepped using which bur?
  52. 4) When prepping a tooth for a gold inlay after placing appropriate blockout material, what is the next step?
    occlusal preparation (vs occlusal reduction, proximal box, proximal extensions)
  53. 5) The walls in the boxes of gold inlay preparations need to be smooth & precise; what is used to smooth the distal axial wall of a DO inlay?
    42S off-angle chisel (vs 43S off-angle chisel, 432 Tucker GMT, 433 Tucker GMT, none of the above)
  54. 1) The main purpose of a dovetail in an MO inlay is to:
    provide resistance in a mesial direction
  55. 2) The angle formed btw axial wall and proximal flare in a Class II gold inlay prep should be:
    135 degrees
  56. ____ the water/powder ratio when investing a wax pattern will result in greater expansion if everything else is the same.
  57. 4) Which of the following requires the least amt of water to mix w the investment powder?
    MO inlay; vs MOD inlay, 7/8 crown, ¾ crown, full gold crown
  58. 5) If a Class II gold inlay wax pattern does not expand adequately during investing and burnout, what will be the result?
    a casting that is too small
  59. Each of the following techniques can be used to compensate for shrinkage of the gold upon cooling, except:
    • * decreasing melting temperature of the gold, vs
    • increasing number of ring lingers,
    • placing ring in a water bath during setting of investment,
    • decreasing water/ powder ratio of investment, and
    • increasing burnout temperature of oven
  60. 2) (T/F) When finishing a Class II gold inlay & fitting it to the die, all the margins should be finished w a rubber wheel:
  61. 3) When finishing a Class II gold inlay, what is used to match the margin of the casting to the tooth?
    medium garnet disc
  62. 4) In finishing a Class II gold inlay, when is the occlusion checked & adjusted?
    after cementation, finishing margins, & removal of rubber dam
  63. 5) (T/F) In finishing a Class II gold inlay, the discs & points should always rotate from tooth to gold
    : F
  64. 1) What is the sequence in polishing the supragingival margins of a gold inlay?
    medium garnet disk, fine sand disk, fine cuttle disk, flour of pumice, 15 micron aluminum oxide, 1 micron aluminum oxide
  65. 2) (T/F) Cement should be applied to both inside the casting and the preparation
    : T
  66. 3) (T/F) Despite susceptibility to fracture, all-ceramic crowns have been in use in dentistry for over a century:
  67. 4) What acid is used to etch etchable ceramic restorations?
    hydrofluoric acid
  68. 5) E.max ceramic is known as a
    highly-filled glass ceramic.
  69. 1) Which of the following composite systems fabricates restorations using powder & liquid?
    feldspar porcelain (vs zirconia, Empress, & E. Max)
  70. 2) Each is a contraindication to all-ceramic restorations in posterior teeth except
    : all of the margins in enamel (vs subgingival margins in cementum, pt w bruxism, chance of flexure)
  71. 3) (T/F) Preps for indirect tooth-colored inlays & onlays should be prepared w chamfer margins for better fit of the restoration:
    F; should have shoulder margins
  72. 4) Internal angles of an all-ceramic ceramic inlay are rounded to increase retention of the final restoration:
    both the statement & the reason are false; internal angles should be rounded to reduce stress, and retention is through bonding
  73. 5) In comparison to gold inlay preps, the internal walls of an all-ceramic inlay prep should have greater
    occlusal divergence.
  74. 1. Recommended occlusal clearance for ceramic onlays with cusp capping
    – 2 mm 
  75. 2. ___ bonding is for ceramic restorations 
  76. 3. ___ is not a precious metal of gold alloy 
  77. 4. high noble content of gold alloy 
  78. 5. Lightens color and adds ductility to gold alloy –
    silver 
  79. 1) Which type (Type I, II, III, or IV) of gold alloy has the greatest gold content?
    cannot be determined
  80. 2) Quenching a gold casting has what effect?
    grain size is smaller & the casting is more malleable (vs grain size is larger & the casting is more malleable, grain size is larger & casting is less malleable, grain size is smaller & the casting is less malleable)
  81. 3) (T/F) Techniques for adjusting, cementing, & finishing all-porcelain restorations are very similar to adjusting, cementing, & finishing metal restorations
    : F
  82. 4) During try-in of all-ceramic restorations, broad flat surfaces, like interproximal contacts, may be adjusted extraorally using the:
    Busch silent stone
  83. 5) After cementing an all-ceramic restoration w resin cement, bulky margins or premature occlusal contacts are adjusted using the:
    fine diamond bur (vs coarse diamond bur, green stone)
  84. 1) When using resin cements to bond all-ceramic restorations, it is recommended light-cured cements be used for anterior veneers and restorations and dual-cured cements be used for posterior inlays and onlays.
  85. 2) Prior to cementation of an all-ceramic restoration, the intaglio surface is etched with
    : hydrofluoric acid
  86. 3) Glass ionomer cements rely primarily on which method of adhesion?
    either nonadhesive luting or micromechanical attachment are acceptable answers; chemical adhesion is minimal w glass ionomer cements
  87. 4) Which of the following type of cements is not indicated for permanent cementation of all-ceramic restorations? zinc oxide & eugenol
  88. 5) Which of the following uses a powder composed of calcium fluoroaluminosilicate glass?
    glass ionomer