A major cause of coronal tooth discoloration may be attributed to remnants of obturation materials left in the pulp chamber following root canal therapy. Endodontic materials that contain certain compounds such as eugenol, phenol, and silver additives may lead to colour changes in coronal tooth structure when they come in contact with dentine. Objectives: The objective of this study was to assess coronal discoloration due to four commonly used endodontic sealers with gutta-percha, using spectrophotometric analysis. Materials and Methods: Extracted human teeth were obturated with the experimental sealers and GP. The sealers that were tested included AH Plus™, EndoRez™, Sealapex™, and Kerr Pulp Canal Sealer™. The teeth were maintained in a moist environment at 37˚C. Immediate pre-treatment readings of the crowns of the extracted teeth with a spectrophotometer were used as baseline data. Subsequent readings were taken every two weeks for two months. Data were analysed using a Wilcoxson Signed Rank Sum test and Kruskal Wallis test (significant at p<0.05). Results: All four root canal sealers showed significant (p<0.05) coronal discolouration of tooth structure after six and eight weeks. There was a significant effect of time on discoloration within each experimental group. Conclusion: Different sealer when used with gutta-percha in the obturation of root canals caused coronal discolouration which increased with time.
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