Effect of vital bleaching on disintegration tendency of glass ionomer restorations.
BACKGROUND
This study was designed to assess the effect of two bleaching agents on the disintegration tendency of three types of glass ionomers.


METHODS
A total of 90 specimens were prepared by using a split Teflon ring with an internal diameter of 5 mm and a thickness of 2 mm. The tested materials were applied and bleached according to manufacturer's instructions. Dissolution measurements were made by calculating weight loss through different periods of the test; (one week, one month and three months) and they were analyzed by using one-way analysis of variance (ANOVA), followed by Tukey's post-hoc test.


RESULTS
All glass ionomer materials exhibited a degree of dissolution. Opalescence Xtra increased the dissolution of Photac Fil and F2000 significantly, while Opalescence Quick had no effect on dissolution of glass ionomer restoratives.


CONCLUSIONS
Bleaching effect on dissolution of glass ionomers is material and time dependant. Care should be taken by clinicians When bleaching teeth that are restored by glass ionomer, because this dissolution may affect the physical properties of these restorations.
Faculty, Department of Restorative Dental Sciences, Al-Farabi College of Dentistry, Riyadh, Saudi Arabia/Department of Pediatric Dentistry, School of Dentistry, Al-Baath University , Syria .
Kusai
K
Baroudi
Faculty, Department of restorative dental Sciences, Al-Farabi College of Dentistry , Riyadh, Saudi Arabia .
Rasha Said
RS
Mahmoud
Faculty, Department of Oral Dignosis, Al-Farabi College of Dentistry , Riyadh, Saudi Arabia .
Bassel
B
Tarakji
Faculty, Department of Restorative Dental Sciences, Al-Farabi College of Dentistry , Riyadh, Saudi Arabia .
Mohammed Alsakran
MA
Altamimi
Bleaching; Glass ionomer; Solubility