Question 105 · LDEK · Tooth discoloration and bleaching
When performing internal bleaching with the ‘walking bleach’ technique, the root canal obturation material should be removed and replaced with a material that provides tight seal to the depth of approximately:
- A. 0.5 mm apically from the root canal orifice.
- B. 2 mm apically from the root canal orifice.
- C. 4 mm apically from the root canal orifice.
- D. 5 mm apically from the root canal orifice.
- E. 3 mm from the apex of the tooth.
Hint
The barrier must reach just beyond the cervical region where peroxide could leak towards the periodontium, without sacrificing much root filling.
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