title: Coronal microleakage with five different temporary restorative materials following walking bleach technique: An ex-vivo study.
abstract: BACKGROUND
  Walking bleach technique uses 30% hydrogen peroxide and sodium perborate, and this paste mixture causes loosening of the coronal temporary restorative materials and thus decreasing its clinical effectiveness and causing irritation to the patients oral tissues. In the present study, sealing ability of hygroscopic coronal temporary restorative materials were compared with the other commonly used temporary restorative materials.
  
  
  OBJECTIVE
  To evaluate the effects of walking bleach material on the marginal sealing ability and coronal microleakage of the hydrophilic temporary restorative materials with that of the other commonly used temporary restorative materials in endodontic practice.
  
  
  METHODS
  Seventy-five extracted human maxillary central incisor teeth were prepared chemo-mechanically and obturated with gutta-percha in lateral condensation technique. Surface of each tooth was double coated with cyanoacrylate glue. All the teeth were randomly divided in to five groups. Out of 15 teeth in each group, 10 teeth served as experimental specimens, in which bleaching agent was placed in the pulp chamber and 5 teeth served as control, in which no bleaching agent was placed. The access cavities were restored with temporary restorative materials being tested per each group respectively. The specimens were then immersed in 1% India ink dye and subjected to thermo cycling for 7 days. All the teeth were longitudinally sectioned and observed with stereomicroscope and were graded according to the depth of linear dye penetration.
  
  
  METHODS
  Mann-Whitney U test and Kruskal-Wallis test.
  
  
  RESULTS
  Hydrophilic temporary restorative materials Cavit G and Coltosol F have shown minimal coronal dye leakage with better sealing ability when exposed to walking bleach paste mixture in the dye penetration tests compared to other commonly used temporary restorative materials.
  
  
  CONCLUSIONS
  Marginal sealing ability of Cavit G and Coltosol F were not influenced by the effects of bleaching agent compared to other temporary restorative materials used in the study.
authors: Department of Conservative Dentistry and Endodontics, Vyas Dental College and Hospital, Jodhpur, India.
authors: G P V
authors: GP
authors: Srikumar
authors: K Ravi
authors: KR
authors: Varma
authors: K Harish
authors: KH
authors: Shetty
authors: Pramod
authors: P
authors: Kumar
keywords: Bleaching agent; dye leakage; dye penetration; microleakage; sealing ability; walking bleach
references: J Endod. 1992 Aug;18(8):376-8
references: 1431692
references: J Endod. 1989 Dec;15(12):569-72
references: 2639956
references: J Endod. 1977 Mar;3(3):110-3
references: 266012
references: Quintessence Int. 2004 Apr;35(4):326-31
references: 15119721
references: J Endod. 1998 Oct;24(10):648-50
references: 10023245
references: Oral Surg Oral Med Oral Pathol. 1977 Apr;43(4):615-20
references: 265490
references: Int Endod J. 2002 Dec;35(12):964-78
references: 12653314
references: Oral Surg Oral Med Oral Pathol. 1978 Jul;46(1):123-30
references: 277870
references: Oral Surg Oral Med Oral Pathol. 1975 Dec;40(6):796-800
references: 1060036
references: J Endod. 1990 Nov;16(11):523-7
references: 2084208
references: Oral Surg Oral Med Oral Pathol. 1992 Nov;74(5):634-43
references: 1437066
references: J Endod. 2000 Dec;26(12):716-8
references: 11471640