In situ effect of 10% carbamide peroxide on resin-dentin bond strengths: a novel pilot study.

PURPOSE This pilot study used a novel study design to evaluate the effect of a 10% carbamide peroxide bleaching gel on the bond strength of a resin-based composite system to dentin. MATERIALS AND METHODS Dentin disks were obtained from human third molars, polished to 600 grit, and mounted on the palatal aspect of a removable orthodontic retainer. Two disks were exposed to a 10% carbamide peroxide bleaching gel for 2 h/d for 21 days, whereas two disks were not treated and served as controls. A retainer was worn by the participant regardless of whether bleaching was used, simulating the action of the saliva/oral fluids on the dentin specimens. After the treatment phase, the dentin disks were retrieved and a resin-based composite system was applied to the specimens following manufacturer's instructions. Composite dentin "sticks" were obtained and tested in microtensile mode. Bond strength values were obtained for treated (n = 20) versus nontreated (n = 26) dentin and were analyzed statistically. RESULTS Mean bond strengths values (SD) were 29.9 MPa (6.2) and 39.2 MPa (5.8) for treated and nontreated dentin specimens, respectively (p < .001). CONCLUSION The results of this study suggest that nightguard (home) bleaching with 10% carbamide peroxide for 2 h/d for 21 days significantly affects resin-dentin bond strengths when dentin is exposed to bleaching material. CLINICAL SIGNIFICANCE The findings of this novel pilot study imply that dentin bonding, such as to exposed root surfaces and cervical areas of the teeth, should not be performed immediately after bleaching with 10% carbamide peroxide.

[1]  M. Yoshinari,et al.  Effect of tubule orientation and dentin location on the microtensile strength of bovine root dentin. , 2002, Dental materials journal.

[2]  P. E. Cardoso,et al.  Microtensile bond strengths of one-bottle dentin adhesives. , 2001, American journal of dentistry.

[3]  J. Perdigão,et al.  Effect of whitening agents on dentin bonding. , 2000, Journal of esthetic dentistry.

[4]  S. Chan,et al.  Effect of carbamide peroxide bleaching on the shear bond strength of composite to dental bonding agent enhanced enamel. , 1999, The Journal of prosthetic dentistry.

[5]  E. Swift,et al.  Ultra-morphological study of the interaction of dental adhesives with carbamide peroxide-bleached enamel. , 1998, American journal of dentistry.

[6]  P. E. Cardoso,et al.  Evaluation of micro-tensile, shear and tensile tests determining the bond strength of three adhesive systems. , 1998, Dental materials : official publication of the Academy of Dental Materials.

[7]  C. Phillips,et al.  Risk factors for developing tooth sensitivity and gingival irritation associated with nightguard vital bleaching. , 1997, Quintessence international.

[8]  M. McCracken,et al.  Demineralization effects of 10 percent carbamide peroxide. , 1996, Journal of dentistry.

[9]  Y. Li.  Biological properties of peroxide-containing tooth whiteners. , 1996, Food and chemical toxicology : an international journal published for the British Industrial Biological Research Association.

[10]  D. Pashley,et al.  Relationship between surface area for adhesion and tensile bond strength--evaluation of a micro-tensile bond test. , 1994, Dental materials : official publication of the Academy of Dental Materials.

[11]  J. Wataha,et al.  Cytotoxicity and Dentin Permeability of Carbamide Peroxide and Hydrogen Peroxide Vital Bleaching Materials, in vitro , 1993, Journal of dental research.

[12]  J. A. Nelson,et al.  Peroxide bleaches: effect on tensile strength of composite resins. , 1993, The Journal of prosthetic dentistry.

[13]  H. O. Heymann,et al.  Nightguard vital bleaching. , 1989, Quintessence international.

[14]  C. Torneck,et al.  Effect of concentrated hydrogen peroxide solution on the surface morphology of cut human dentin. , 1988, Endodontics & dental traumatology.

[15]  W. H. Bowles,et al.  Pulp chamber penetration by hydrogen peroxide following vital bleaching procedures. , 1987, Journal of endodontics.

[16]  D. Pashley,et al.  Effects of prism orientation on tensile strength of enamel. , 2000, The journal of adhesive dentistry.

[17]  D. Pashley,et al.  The microtensile bond test: a review. , 1999, The journal of adhesive dentistry.

[18]  P. Lambrechts,et al.  The clinical performance of adhesives. , 1998, Journal of dentistry.

[19]  P. Spencer,et al.  Characterization of enamel exposed to 10% carbamide peroxide bleaching agents. , 1993, Quintessence international.