European Journal of Prosthodontics and Restorative Dentistry

cover art

Cover Date:
September 2007
Print ISSN:
0965-7452
Vol:
15
Issue:
3

The Microhardness of Bleached Dentine and its Bond Strength to a Dentine Bonding Agent

Abstract - The aim of this study was to measure the hardness of a bleached dentine surface and its bond strength to a dentine-bonding agent. Thirty teeth were randomly divided into a test and control group. The teeth were hemisectioned, the cut surfaces ground flat and the test surfaces bleached with a 10% aqueous solution of carbamide peroxide continuously for 4 days. Hardness was determined using a Vickers microhardness test. The bond between Coltene ‘One Coat Bond’ and bleached and unbleached dentine was evaluated by measuring shear bond strength using an Instron machine. The mean hardness of dentine before and after bleaching was 62.5 (10.2) and 53.6 (7.3) and this difference was statistically different (p<0.001). For the controls immersed in water the hardness was before 60.8 (standard deviation: 7.2) and after 59.6 (8.2) respectively. The mean shear bond strength for the unbleached was 5.5MPa (1.6) and for the bleached samples was 3.3MPa (1.8) and this difference was statistically significant (p<0.002). Under these study conditions the Vickers hardness and bond strength to dentine was reduced by bleaching.

KEY WORDS: Vital bleaching, Carbamide peroxide, Dentine

Article Price
£15.00
Institution Article Price
£
Page Start
131
Page End
134
Authors
M.P Dadoun, D.W Bartlett

Articles from this issue

  • Title
  • Pg. Start
  • Pg. End

  1. Effect of selected mouthwashes with and without toothbrushing on the surface hardness of a resin modified glass-ionomer and two compomers.
  2. 98
  3. 103

  1. Prospective Evaluation of the Referral Pattern to Restorative Dentistry Consultation Clinics in Ireland
  2. 104
  3. 107

  1. The Acrylic Tooth-denture Base Bond: Effect of Mechanical Preparation and Surface Treatment
  2. 108
  3. 114

  1. The Bilateral Distal Extension Removable Partial Denture: Mechanical Problems and Solutions
  2. 115
  3. 121

  1. A Survey of Consultants and Specialists in Restorative Dentistry on their use of Health-Related Quality of Life questionnaires.
  2. 122
  3. 126

  1. An Investigation of the Accuracy of Refixing Broken Teeth to Stone Casts
  2. 127
  3. 130

  1. The Microhardness of Bleached Dentine and its Bond Strength to a Dentine Bonding Agent
  2. 131
  3. 134

  1. The Early Fluoride Release Pattern of an Aged Glass Ionomer Treated With Fluoride
  2. 135
  3. 141