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Intracanal isolating barriers as they relate to bleaching
D M Brighton1, G W Harrington, J I Nicholls
1Department of Endodontics, University of Washington.
Journal of Endodontics
|May 1, 1994
Summary
None of the tested restorative materials effectively prevented bleaching agent leakage into the root canal. All materials showed a high incidence of leakage, indicating a need for improved intracanal isolating barriers in dental treatments.
Area of Science:
- Endodontics
- Dental Materials Science
- Restorative Dentistry
Background:
- Bleaching agents can leak through restorative materials into the root canal.
- Effective intracanal barriers are crucial to prevent damage from bleaching agents.
Purpose of the Study:
- To evaluate four restorative materials as intracanal isolating barriers against bleaching agent leakage.
- To determine the effectiveness of zinc oxide-eugenol, IRM, Ketac-Cem, and Scotchbond Multipurpose in preventing leakage.
Main Methods:
- Fifty-five extracted teeth were stained, instrumented, and filled with gutta-percha.
- Restorative materials were placed as intracanal barriers after gutta-percha removal.
- Teeth underwent thermocatalytic and walking bleach techniques, followed by examination for root bleaching.
Main Results:
- No tested material provided complete isolation against bleaching agent leakage.
- IRM showed a significant difference compared to Ketac-Cem and Scotchbond Multipurpose (p < 0.05).
- Zinc oxide-eugenol and IRM showed no significant difference in leakage prevention.
Conclusions:
- Current restorative materials are not fully effective as intracanal barriers against bleaching agents.
- Further research is needed to develop superior materials for preventing bleaching agent microleakage.