Effect of newer antioxidants on the bond strength of composite on bleached enamel.
OBJECTIVE
The study aims to evaluate the effect of the application of two antioxidants on the bond strength of composite resin to bleached enamel.


METHODS
Eighty enamel surfaces were obtained from forty human extracted premolars. Specimens were randomly divided into four groups (n = 20). Group 1: No bleaching (control); Group 2a: Bleaching with 15% carbamide peroxide gel; Group 2b: Bleaching, followed by application of 10% sodium ascorbate gel; Group 2c: Bleaching, followed by application of 5% proanthocyanidin agent. Surfaces were etched followed by application of total etch bonding system, and composite resin cylinders were bonded. Specimens were tested for shear bond strength.


METHODS
One-way analysis of variance was used for multiple group comparison and post hoc Tukey's test for individual group-wise comparison.


RESULTS
Significantly higher shear bond strength values were observed in Group 2c and 2b as compared with Group 1 and 2a (P < 0.05). Among the antioxidants, Group 2c showed significantly higher shear bond strength values than Group 2b (P < 0.05).


CONCLUSIONS
It can be concluded that the use of antioxidant before bonding procedures on bleached enamel completely neutralizes the deleterious effects of bleaching and increases the bond strength significantly.
Department of Pedodontics and Preventive Dentistry, Vivekanandha Dental College, Namakkal, Tamil Nadu, India.
M
M
Manoharan
Department of Pedodontics and Preventive Dentistry, College of Dental Sciences, Davangere, Karnataka, India.
K K
KK
Shashibhushan
Department of Pedodontics and Preventive Dentistry, College of Dental Sciences, Davangere, Karnataka, India.
P
P
Poornima
Department of Pedodontics and Preventive Dentistry, Institute of Dental Sciences, Bareilly, Uttar Pradesh, India.
Sathyajith N
SN
Naik
Department of Pedodontics and Preventive Dentistry, College of Dental Sciences, Davangere, Karnataka, India.
Disha
D
Patil
Department of Pedodontics and Preventive Dentistry, College of Dental Sciences, Davangere, Karnataka, India.
A S
AS
Shruthi
D000134:Acid Etching, Dental; D000704:Analysis of Variance; D000975:Antioxidants / Q000494:pharmacology*; D001205:Ascorbic Acid / Q000494:pharmacology; D001641:Bicuspid; D000077463:Carbamide Peroxide; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel / Q000187:drug effects*; D003764:Dental Materials / Q000737:chemistry; D003799:Dental Stress Analysis; D004338:Drug Combinations; D006801:Humans; D010545:Peroxides / Q000494:pharmacology; D044945:Proanthocyanidins / Q000494:pharmacology; D033081:Shear Strength; D014073:Tooth Bleaching; D014508:Urea / Q000031:analogs & derivatives / Q000494:pharmacology
D000975:Antioxidants; D003188:Composite Resins; D003764:Dental Materials; D004338:Drug Combinations; D010545:Peroxides; D044945:Proanthocyanidins; C013221:proanthocyanidin; D000077463:Carbamide Peroxide; D014508:Urea; D001205:Ascorbic Acid