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.
Yu
Hao
H
Department of Prosthodontics, School and Hospital of Stomatology, Wuhan University, Wuhan, China.
Li
Qing
Q
Lin
Yao
Y
Buchalla
Wolfgang
W
Wang
Yining
Y
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