MCQs in Endodontics

Chapter 25: Bleaching


 1- Which of the following is not helpful in determining if a patient is appropriate for bleaching:

  1. Recent periapical radiographs.
  2. Vitality tests.
  3. Transillumination.
  4. An intraoral camera.







The answer is: D


 2- The most difficult stains from dental treatment to bleach successfully are from:

  1. amalgam restoration.
  2. root canal sealers.
  3. composite restorations.
  4. gold restorations.







The answer is: B


 3- Teeth are most susceptible to tetracycline staining from:

  1. four months in utero to eight years of age.
  2. birth to seven years of age.
  3. seven months in utero until the third molars are formed.
  4. anytime during life.







 The answer is: A


 4- As described by Jordan and Boksman, third degree tetracycline staining is:

  1. dark gray or blue in color, with banding.
  2. dark yellow or gray in color.
  3. too dark to bleach.
  4. light yellow or gray in color.







The answer is: A


 5- Minocycline, in contrast to other tetracyclines:

  1. causes staining of enamel.
  2. causes discoloration in teeth after calcification,
  3. chelates with calcium to form tooth pigmentation.
  4. all of the above.







The answer is: B


 6- Fluorosis:

  1. affects ameloblasts resulting in defective enamel development.
  2. most commonly affects premolars.
  3. is caused by drinking water containing fluoride concentrations in excess of one part per million,
  4. all of the above.







The answer is: D


 7- Which of the following is not a contraindication to bleaching:

  1. Dentin hypersensitivity.
  2. Teeth with white spots.
  3. Patients over 70 years of age.
  4. Patients who are perfectionists.







The answer is: C


 8- Which of the following statements concerning microabrasion is false:

  1. It is effective in treating white spots.
  2. The active ingredient is hydrochloric acid.
  3. It permanently removes surface stains.
  4. It can successfully treat some tetracycline stains.







The answer is: D


9- Etching the enamel prior to bleaching:

  1. enhances the penetrability of the bleaching solutions.
  2. shortens the appointment time.
  3. retains the fluoride-rich surface layer of enamel.
  4. all of the above.







The answer is: A


 10- The usual range of temperatures for bleaching vital teeth with a heat or light source is:

  1. 100 to 115 degrees.
  2. 115 to 140 degrees.
  3. 140 to 160 degrees.
  4. 160 to as high as the patient can tolerate.







The answer is: B


 11- Which of the following is not necessary for vital bleaching:

  1. Patient wears safety glasses.
  2. Local anesthesia.
  3. Pumice prophylaxis.
  4. Polish teeth after last treatment.






The answer is: B


 12- The barrier material for bleaching pulpless teeth should be:

  1. IRM.
  2. dental sealant.
  3. glass ionomer cement.
  4. zinc oxyphosphate.







The answer is: C


 13- Cervical resorption in bleached pulpless teeth may result from:

  1. bleach placed apical to the CEJ.
  2. tooth becoming pulpless before patient reaches age 25.
  3. a defect in the CEJ.
  4. all of the above.







The answer is: D


 14- The most common treatment for cervical resorption following intracoronal bleaching is:

  1. surgical repair.
  2. orthodontic extrusion.
  3. extraction.
  4. calcium hydroxide therapy.







The answer is: A


 15- Which of the following is not part of the bleaching procedure for endodontieally treated teeth:

  1. Rubber dam isolation.
  2. Acid etching.
  3. Superoxo! or sodium perborate.
  4. A heat source.







The answer is: B


16- With nightguard vital bleaching:

  1. the reported success rate is 75%.
  2. fluorosed teeth are the least responsive.
  3. the bleaching agent is 10% carbamide peroxide.
  4. patients wiih removable partial dentures can wear the nightguard only at night.






The answer is: C


17- Unknowns about nightguard bleaching include all of the following except:

  1. longevity
  2. effects on restorations.
  3. efficacy.
  4. none of the above.







The answer is: B


18- Patient instructions during nightguard bleaching include:

  1. replace bleaching solution every 3 to 4 hours.
  2. wear nightguard as long as possible.
  3. discontinue treatment and contact The dentist if teeth becomehypersensitive.
  4. all of the above.






The answer is: C


19- Following the second appointment, the nightguard bleaching patient should return to the office when:

  1. the desired shade is achieved.
  2. six weeks have passed.
  3. if side effects need attention.
  4. all of the above, whichever comes first.






The answer is: D