title: An In Vitro Comparative Study of Shear Bond Strength of Composite Resin to Bleached Enamel using Synthetic and Herbal Antioxidants.
abstract: BACKGROUND
  The bond strength to bleached enamel is reduced, if adhesive restorations are carried out immediately. So the purpose of this in vitro study was an attempt to regain the lost bond strength, for which, the comparison of shear bond strength of composite resin to bleached enamel was carried out using various antioxidants: 10% Sodium ascorbate, Rosemary extracts, Pedicularis extracts.
  
  
  METHODS
  Fifty human extracted single rooted teeth were collected. They were decoronated and coronal portions were embedded in self cure acrylic resin with their buccal surfaces facing upwards. The samples were randomly divided into positive, negative control groups and three experimental groups (n = 10). In positive control group, specimens were not bleached, before bonding procedure. In negative control group, bleaching was done with 10% carbamide peroxide and bonding was carried out immediately. In experimental groups, following antioxidants were used after bleaching: Group A: 10% Sodium ascorbate, Group B: Rosemary extracts, Group C: Pedicularis extracts. Then the bonding procedures were carried out in all the groups and were subjected for shear bond strength analysis.
  
  
  RESULTS
  Results clearly showed that groups A and B were effective in reversal of bond strength immediately.
  
  
  CONCLUSIONS
  10% sodium ascorbate solution and rosemary extracts were effective in reversal of shear bond strength immediately after bleaching.
authors: Assistant Professor, Department of Endodontics, CKS Teja Institute of Dental Sciences and Research, Tirupati, Andhra Pradesh, India.
authors: Ram
authors: R
authors: Suneetha
authors: Reader, Department of Endodontics, People's College of Dental Sciences and Research Centre, Bhopal, Madhya Pradesh, India.
authors: S
authors: S
authors: Pavithra
authors: Senior Lecturer, Department of Orthodontia, Maharashtra Institute of Dental Sciences and Research Centre, Latur, Maharashtra, India.
authors: John
authors: J
authors: Thomas
authors: Assistant Professor, Department of Endodontics, Sri Venkateswara Medical College and Hospital, Tirupathi, Andhra Pradesh, India.
authors: G Swapna Priya
authors: GS
authors: Nanga
authors: Senior Lecturer, Department of Endodontics, KD Dental College and Hospital, Mathura, Uttar Pradesh, India.
authors: Aseem
authors: A
authors: Shiromany
authors: Senior Lecturer, Department of Prosthodontics, Rajasthan Dental College and Hospital, Jaipur, Rajasthan, India.
authors: Amit
authors: A
authors: Shivrayan
keywords: 10% carbamide peroxide; 10% sodium ascorbate; Artificial saliva; shear bond strength
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