The world's first wiki where authorship really matters (Nature Genetics, 2008). Due credit and reputation for authors. Imagine a global collaborative knowledge base for original thoughts. Search thousands of articles and collaborate with scientists around the globe.

wikigene or wiki gene protein drug chemical gene disease author authorship tracking collaborative publishing evolutionary knowledge reputation system wiki2.0 global collaboration genes proteins drugs chemicals diseases compound
Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Effect of whitening dentifrices on the superficial roughness of esthetic restorative materials.

Purpose: The purpose of this study was to investigate the surface roughness (Ra) of different esthetic restorative materials following simulated toothbrushing using different whitening dentifrices. Materials and Methods: Cylinders of Esthet-X (Dentsply Caulk, Milford, DE, USA), Durafil VS (Heraeus Kulzer, Wehrheim, Germany), and Vitremer (3M ESPE, St. Paul, MN, USA) were made using molds (4 mm in diameter for 2 mm in height). The superficial roughness was evaluated using a profilometer (Ra) with a cutoff length of 0.25 mm and a speed of 0.1 mm/s. The specimens (N = 13) were submitted to 7,500 brushing cycles using five different toothpastes: (1) Crest Regular (control; Procter & Gamble): silica abrasive (C); (2) Crest Extra Whitening (Procter & Gamble, Cincinnati, OH, USA): bicarbonate + calcium pyrophosphate (CE); (3) Dental Care A & H (Arm & Hammer, Camilla, GA, USA): bicarbonate (DC); (4) Rembrandt Plus Whitening (Oral B Laboratories, Belmont, CA, USA): carbamide peroxide + alumina/silica (RP); and (5) experimental: hydrogen peroxide + calcium carbonate (EX). Results: The data were analyzed by analysis of variance and Tukey's test (alpha = .05) for each restorative material, and the results [difference between final and initial roughness: Ra(F) - Ra(I) in microm] were as follows: Esthet-X: EX = 0.15 + 0.07a; RP = 0.29 + 0.16a; CE = 0.96 + 0.33b; C = 1.03 + 0.29b; DC = 1.48 + 0.37b; Durafil VS: RP = 0.09 + 0.07a; EX = 0.55 + 0.23abc; C = 0.96 + 0.26bc; CE = 1.03 + 0.33cd; DC = 1.09 + 0.37d; and Vitremer: EX = 0.10 + 0.08a; RP = 0.26 + 0.19a; CE = 0.94 + 0.27b; DC = 1.13 + 0.46bc; C = 1.50 + 0.32c (different letters mean differences among groups). Conclusion: It was verified that the dentifrices containing carbamide or hydrogen peroxide along with alumina + silica and calcium carbonate, respectively (groups 4 and 5), produced minor changes in Ra when compared with the control group and with those dentifrices containing bicarbonate (groups 2 and 3). CLINICAL significance The results of this study indicate that whitening dentifrices evaluated containing silica or calcium carbonate were less abrasive when used on the resin-based esthetic restorative materials than those that contain sodium bicarbonate. (J Esthet Restor Dent 18:102-109, 2006).[1]

References

  1. Effect of whitening dentifrices on the superficial roughness of esthetic restorative materials. Amaral, C.M., Rodrigues, J.A., Erhardt, M.C., Araujo, M.W., Marchi, G.M., Pimenta, L.A. Journal of esthetic and restorative dentistry : official publication of the American Academy of Esthetic Dentistry ... [et al.] (2006) [Pubmed]
 
WikiGenes - Universities