IADR Abstract Archives
A comparison of shear bond strength between human dental enamel and composite resin when using rice gel bleaching versus commercial bleaching: A pilot study
Objectives: To investigate the shear bond strength of composite resin to human enamel which was treated by bleaching rice gel compared with commercial bleaching gel.
Methods: Eight-four human enamel chips (4x4x3 mm3) were randomly divided into 7 groups (12 for each group; 10 for shear bond strength testing and 2 for surface morphology analysis under scanning electron microscopic (SEM) before and after bleaching time) Enamel chips were bleached for 2 weeks. The commercial carbamide peroxide (CP) gel and CP rice gel were used in test groups. For the duration, the specimens were immersed 8-10 hours or overnight in 10% CP and 2-4 hours in 20% CP. Placebo rice gel and artificial saliva (overnight) were used as negative controls while 35% commercial CP was used as a positive control for 1 hour. Specimens were kept in 100% relative humidity at 370C. After the bleaching period, ten specimens were stored in artificial saliva at 370C for 24 hours before were bonded with cylinders of composite resin. Shear bond strength tests were determined with a universal testing machine. The average of shear bond strength was compares by one way ANOVA with a significant level of 0.05
Results: The analysis of variance did not show differences in shear bond strength among the groups with a significant level of 0.05. Moreover, scanning electron microscopy study in bleached enamel surfaces shown little or no change in morphology. The mode of failures are adhesive failure (47.14%), cohesive failure in enamel (11.43%) and mixed failure (41.43%).
Conclusions: No difference in mechaniical property between commercial bleaching gel and rice bleaching gel when investigated the shear bond strength of composite resin to bleached enamel.
Methods: Eight-four human enamel chips (4x4x3 mm3) were randomly divided into 7 groups (12 for each group; 10 for shear bond strength testing and 2 for surface morphology analysis under scanning electron microscopic (SEM) before and after bleaching time) Enamel chips were bleached for 2 weeks. The commercial carbamide peroxide (CP) gel and CP rice gel were used in test groups. For the duration, the specimens were immersed 8-10 hours or overnight in 10% CP and 2-4 hours in 20% CP. Placebo rice gel and artificial saliva (overnight) were used as negative controls while 35% commercial CP was used as a positive control for 1 hour. Specimens were kept in 100% relative humidity at 370C. After the bleaching period, ten specimens were stored in artificial saliva at 370C for 24 hours before were bonded with cylinders of composite resin. Shear bond strength tests were determined with a universal testing machine. The average of shear bond strength was compares by one way ANOVA with a significant level of 0.05
Results: The analysis of variance did not show differences in shear bond strength among the groups with a significant level of 0.05. Moreover, scanning electron microscopy study in bleached enamel surfaces shown little or no change in morphology. The mode of failures are adhesive failure (47.14%), cohesive failure in enamel (11.43%) and mixed failure (41.43%).
Conclusions: No difference in mechaniical property between commercial bleaching gel and rice bleaching gel when investigated the shear bond strength of composite resin to bleached enamel.