title: Effect of Catalase and Sodium Fluoride on Human Enamel bleached with 35% Carbamide Peroxide.
abstract: OBJECTIVE
  To evaluate the effects of postbleaching antioxidant application fluoridation treatment on the surface morphology and microhardness of human enamel.
  
  
  METHODS
  Ten freshly extracted human maxillary central incisors were cut at cementoenamel junction. Crown portion was sectioned into six slabs which were divided into five groups: group A - untreated controls; group B - 35% carbamide peroxide (CP); group C - 35% CP and catalase; group D - treatment with 35% CP and 5% sodium fluoride; group E - 35% CP, catalase and 5% sodium fluoride. Thirty-five percent carbamide peroxide application included two applications of 30 minutes each at a 5-day interval. After treatment, the slabs were thoroughly washed with water for 10 seconds and stored in artificial saliva at 37°C until the next treatment. Two percent sodium fluoride included application for 5 minutes. Three catalase included application for 3 minutes.
  
  
  RESULTS
  After 5 days, groups B and C showed significantly decreased enamel microhardness compared to control. Group D specimens showed relatively less reduction in enamel micro-hardness than group C specimens. There is a marked increase in enamel microhardness in group E specimens.
  
  
  CONCLUSIONS
  Fluoride take up was comparatively enhanced after catalase application resulting in less demineralization and increased microhardness. How to cite this article: Thakur R, Shigli AL, Sharma DS, Thakur G. Effect of Catalase and Sodium Fluoride on Human Enamel bleached with 35% Carbamide Peroxide. Int J Clin Pediatr Dent 2015;8(1):12-17.
authors.affiliation: Senior Lecturer, Department of Pedodontics, People's College of Dental Sciences and Research Centre, Bhopal, Madhya Pradesh India.
authors.forename: Ruchi
authors.initials: R
authors.lastname: Thakur
authors.affiliation: Professor and Head, Department of Pedodontics and Preventive Dentistry, Bharati Vidyapeeth University Dental College and Hospital, Sangli Maharashtra, India.
authors.forename: Anand L
authors.initials: AL
authors.lastname: Shigli
authors.affiliation: Professor and Head, Department of Pedodontics and Preventive Dentistry, Modern Dental College and Research Centre, Indore, Madhya Pradesh India.
authors.forename: Divya S
authors.initials: DS
authors.lastname: Sharma
authors.affiliation: Reader, Department of Oral and Maxillofacial Surgery, People's College of Dental Sciences and Research Centre, Bhopal Madhya Pradesh, India.
authors.forename: Gagan
authors.initials: G
authors.lastname: Thakur
keywords: Carbamide peroxide; Catalase; In-office bleaching; Sodium fluoride.