Influence of carbamide peroxide on the flexural strength of tooth-colored restorative materials: an in vitro study at different environmental temperatures.
The current study investigated the influence of carbamide peroxide on the flexural strength of tooth-colored restorative materials at two environmental temperatures. Seven restorative materials were used, including four resin composites (Filtek Z350, Filtek Z250, Synergy Flow and Filtek P60), a polyacid-modified composite (Dyract AP), a conventional glass-ionomer cement (Ketac Molar Easymix) and a ceramic (Vitablocs Mark II). For each type of material, 80 bar-shaped specimens were fabricated and divided into four groups (n = 20): bleaching group at 25 degrees C, control group at 25 degrees C, bleaching group at 37 degrees C and control group at 37 degrees C. The specimens in the bleaching groups were treated with 10% carbamide peroxide gel for eight hours/day, while the control specimens in their respective groups were stored in deionized water. After 14-day treatment, the flexural strength of the specimens was determined using a universal testing machine. All the results were analyzed with ANOVA and the Tukey's post-hoc test. The data were also submitted to Weibull distribution. The flexural strength and its Weibull distribution of polyacid-modified composite and glass-ionomer cement were more seriously affected by bleaching agents than the resin composite and ceramic, especially at the higher environmental temperature.
Department of Prosthodontics, School and Hospital of Stomatology, Wuhan University, Wuhan, China.
Hao
H
Yu
Qing
Q
Li
Yao
Y
Lin
Wolfgang
W
Buchalla
Yining
Y
Wang
D000077463:Carbamide Peroxide; D020770:Compomers / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D003799:Dental Stress Analysis / Q000295:instrumentation; D055119:Elastic Modulus; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D016877:Oxidants / Q000737:chemistry*; D010545:Peroxides / Q000737:chemistry*; D018583:Pliability; D013314:Stress, Mechanical; D013696:Temperature; D013997:Time Factors; D014508:Urea / Q000031:analogs & derivatives* / Q000737:chemistry
D020770:Compomers; D003188:Composite Resins; D003764:Dental Materials; C088486:Dyract; C438835:Filtek P60 Composite Resin; C444701:Filtek Z250; D005899:Glass Ionomer Cements; C515713:Ketac Molar Easymix; D016877:Oxidants; D010545:Peroxides; C452441:Synergy composite resin; C096477:Vitabloc MK1; C533204:filtek Z350; D003776:Dental Porcelain; D000077463:Carbamide Peroxide; D014508:Urea