Comparison of Laser Versus Rotary Instrumentation A Case Study - Exam 81
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by Gregory, Lea, Walinski, Koch, Hottel, Fields, Rodriguez
The use of an erbium laser to treat carious teeth has proven to have several advantages when compared to rotary instruments. The clinician is able to remove a minimal amount of tooth structure, thus minimizing the risk of pulpal exposure. The extremely short pulses of erbium lasers combined with an aerosolized water
spray have been shown to cool the pulp as opposed to rotary instruments which
may create heat that could lead to a pulpitis.

Questions:
 1) A Erbium laser can be used to:
  1. re-contour gingiva
  2. control hemorrhage
  3. remove caries
  4. prepare a tooth for a composite restoration
  5. all of the above
 2) When utilizing an Erbium laser for caries removal and tooth preparation:
  1. carious dentin is ablated first because it is softer and has a higher water content
  2. tooth preparation time is significantly increased
  3. pulpal temperatures may actually decrease during preparation
  4. A and C
  5. all of the above
 3) Tooth preparation with an Erbium laser:
  1. provides a better bonding surface for the composite restoration
  2. kills bacteria within the preparation
  3. does not leave a smear layer
  4. all of the above
 4) When utilizing an Erbium laser for tooth preparation:
  1. heat generated by friction occurs in the pulp
  2. pulpitis occurs more frequently
  3. pulp cooling occurs
  4. pulpal exposures are not possible
 5) Erbium laser energy is absorbed by:
  1. carious dentin
  2. dental alloy
  3. water
  4. dydroxyapatite
  5. a, c and d