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   effect of accelerated aging on color stability of two silica-based ceramics with leucite and lithium-disilicate crystalline phases after glazing and polishing  
   
نویسنده mirzaie m. ,pahlavan a. ,hooshmand t. ,safaee h. ,khalesi tooyrekani r.
منبع journal of islamic dental association of iran - 2018 - دوره : 30 - شماره : 1 - صفحه:21 -31
چکیده    background and aim: color match between prosthetic restorations and natural teeth is challenging in dentistry. the aim of the current study was to assess the effect of accelerated aging on color stability of two silicabased ceramics with leucite and lithium disilicate crystalline phases after glazing and polishing surface treatments. materials and methods: in this experimental study, 30 discshaped specimens (1.5x10mm) of ips e.max press and ceramco iii ceramics were fabricated according to the manufacturers' instructions. the specimens were randomly divided into two groups of surface treatments (glazing and polishing) and were then subjected to accelerated aging for 300 hours. color parameters were measured before and after aging using a spectrophotometer. the l*, a* and b* parameters and the color change (∆e) of ceramics (based on the cie l*a*b* system) before and after glazing were determined by spectrophotometry. data were analyzed using twoway anova and t-test. p<0.05 was considered statistically significant.results: after 300 hours of aging, the color stability (∆e), ∆l and ∆b of polished group was less than that of glazed group. the two ceramic types were not significantly different in terms of ∆e (range: 1.31 to 2.53; p=0.055).conclusion: glazed silica-based ceramics had higher color stability than polished ceramics after aging in our study. color stability of silicabased ceramic systems was influenced by the surface texture and not the type of crystalline phase.
کلیدواژه lithia disilicate ,aging ,discoloration
آدرس tehran university of medical sciences, school of dentistry, dentistry research institute, dental research center, department of operative dentistry, ایران, tehran university of medical sciences, school of dentistry, dentistry research institute, dental research center, department of operative dentistry, ایران, tehran university of medical sciences, school of dentistry, research center for science and technology in medicine, department of dental biomaterials, ایران, tehran university of medical sciences, school of dentistry, department of operative dentistry, ایران, hamedan university of medical sciences, school of dentistry, department of operative dentistry, ایران
پست الکترونیکی reyhanehkhalesi@yahoo.com
 
 

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