Effect of a bleaching agent on abrasion of resin-based restoratives.
OBJECTIVE
To evaluate the effect of a 10% carbamide peroxide-containing bleaching agent on brushing abrasion of esthetic restorative materials.


METHODS
Using a randomized complete block design, 150 specimens (n = 15) measuring 3 x 3 x 2 mm were fabricated into acrylic resin cylinders, using one of the restorative materials: a microfilled resin composite (Al), a hybrid resin composite (Ch), a flowable resin composite (Wa), a resin-modified glass-ionomer cement (Fj) and a polyacid-modified resin composite (Dy). The bleaching agent or artificial saliva (control) was applied for 2 hours/day. After that, 120 brushing strokes were simulated automatically and the samples were kept in artificial saliva. Such bleaching/brushing cycle was performed daily for 21 days. Wear depth was assessed using profilometry.


RESULTS
Bleaching did not show significant effect on wear depth. There was a significant difference among the restorative materials. Tukey's test showed that (Al = Ch) < (Wa) < (Fj) and that Dy was only different from Fj.
Faraoni-Romano
Juliana Jendiroba
JJ
Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Brazil.
Turssi
Cecilia Pedroso
CP
Serra
Mônica Campos
MC
D000077463:Carbamide Peroxide; D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry; D019554:Dental Restoration Wear; D004338:Drug Combinations; D005899:Glass Ionomer Cements / Q000737:chemistry; D016877:Oxidants; D010545:Peroxides; D011897:Random Allocation; D014073:Tooth Bleaching / Q000379:methods; D014099:Toothbrushing; D014508:Urea / Q000031:analogs & derivatives
D020770:Compomers; D003188:Composite Resins; D004338:Drug Combinations; D005899:Glass Ionomer Cements; D016877:Oxidants; D010545:Peroxides; D000077463:Carbamide Peroxide; D014508:Urea