Introduction-`Increased awareness about aesthetic has resulted in popularity of the more conservative techniques of tooth whitening with bleaching. However, an additional restorative treatment is often needed to attain desired aesthetics even after bleaching. An important consequence of use of carbamide peroxide as bleaching agent is decreased bond strength of composite resin when applied to enamel immediately after bleaching. The decreased bond strength is due to presence of oxygen ion that inhibits resin polymerisation.
Antioxidant application is implemented to avoid delay in restoration. Hence effect of different antioxidant on enamel surface after bleaching should be evaluated for shear bond strength.
Material and Method - Fourty enamel slabs of size (3mm*3mm*2mm) will be prepared from maxillary central and lateral incisor. Each enamel specimen will be mounted in acrylic resin. All specimens will be randomly divided into four group, each
containing 10 specimens. Group I (Control Group) will not receive any bleaching treatment and will kept in water at 370 C for 1 week.
All other group will be subjected to 35% carbamide peroxide bleaching and then treated with following group
Group II (Super-oxide dismutase)
Group III (10% Sodium ascorbate)
Group IV (5%Pranthocyanidine)
Then all specimen will be restored with composite and will be subjected to
Universal testing machine to evaluate the shear bond strength at cross head
speed of 1mm/min.
Result - Awaited
Impact Factor
2022: 6.012
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