title: A comparative study of four coronal obturation materials in endodontic treatment.
abstract: The aim of this study was to compare, in vitro, the ability of temporary versus permanent materials to seal the access cavity. Eighty human maxillary single-canal teeth were prepared biomechanically and obturated with gutta-percha and an endodontic cement AH Plus, using the warm vertical compaction technique. All access cavities were sealed with 1 of 4 materials (Cavit, Fermit, Tetric, or Dyract). Microleakage was assessed by methylene blue dye penetration. The teeth were submitted to 100 thermocycles, with temperature varying from 0 degree to 55 degrees C. The greatest degree of leakage was observed with the temporary materials (Cavit and Fermit). There was a significant difference (p < 0.05) in leakage between all materials except between Dyract and Tetric. This suggests that it may be more prudent to use a permanent restorative material for provisional restorations to prevent inadequate canal sealing and the resulting risk of fluid penetration.
mesh_terms: D002133:Calcium Sulfate; D020770:Compomers; D003188:Composite Resins; D003738:Dental Cements; D003763:Dental Leakage / Q000517:prevention & control*; D003793:Dental Restoration, Permanent; D003794:Dental Restoration, Temporary; D004338:Drug Combinations; D004853:Epoxy Resins; D006171:Gutta-Percha; D006801:Humans; D008689:Methacrylates; D011109:Polymethacrylic Acids; D011145:Polyvinyls; D012387:Root Canal Filling Materials; D012389:Root Canal Obturation / Q000379:methods*; D017640:Silicates; D018709:Statistics, Nonparametric; D019228:Tooth Crown; D015034:Zinc Oxide