Effect of bleaching agents on surface free energy parameters of resin composite coated with saliva biofilm


DOĞAN BUZOĞLU H. , GÜMÜŞDERELİOĞLU M. , Rotstein I.

AMERICAN JOURNAL OF DENTISTRY, vol.22, no.4, pp.223-227, 2009 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 22 Issue: 4
  • Publication Date: 2009
  • Title of Journal : AMERICAN JOURNAL OF DENTISTRY
  • Page Numbers: pp.223-227

Abstract

Purpose: To assess the effect of 10% carbamide peroxide and 10% hydrogen peroxide bleaching preparations oil the surface free energy of resin composite with and without saliva biofilm coating. Methods: 72 light-cured resin composite samples were used. The samples were either coated with fresh human saliva or left uncoated. Each sample was placed in a plastic assay tube containing 2 ml of either 10% carbamide peroxide (CP), 10% hydrogen peroxide (HP), or phosphate buffer solution. The tubes containing the composite samples were then placed in a dry incubator at 37 degrees C for 1- and 3-day time intervals. After each time interval the samples were rinsed with distilled water and subjected to wetting measurements using a captive bubble technique. Measurements were taken in triplicate and determination of contact angles done by using film negatives on an enlarger. The differences between pre-treatment and post-treatment measurements and between samples coated with saliva and non-coated samples were analyzed statistically for each time period and treatment group. Results: 10% CP reduced octane contact angle of all exposed composite groups after 1 day of treatment regardless of saliva coating. Differences between the pre-bleached and post-bleached groups were statistically significant only for octane contact angles measured in saliva-coated samples (P< 0.05). 10% CP reduced both the octane and air contact angles of all exposed composite surfaces after 3 days of treatment. The reduction was statistically significant only for octane contact angles measured in the saliva-coated samples (P< 0.05). Additionally, 10% CP significantly reduced the surface free energy of saliva-coated samples after 1-day treatment as compared to non-coated samples. 10% H P reduced octane contact angle of all exposed composite groups after 1 day of treatment regardless of saliva coating. The differences between the pre-bleached and post-bleached groups were statistically significant only for octane contact angles measured in the saliva-coated samples (P< 0.05). 10% HP reduced both the octane and air contact angles of all exposed resin composite surface samples after 3 days of treatment regardless of saliva coating. However, the differences between the groups were not statistically significant. (Am J Dent 2009;22:223-227).