title: A study to assess the colour stability of acetal resins subjected to thermocycling.
abstract: The purpose of this study was to compare colour stability of pink and white acetal resin with one conventional poly (methylmethacrylate) resin. Five specimen disks 50 +/- 0.1 mm in diameter and approximately 1.0 mm thick were prepared from each material. The discs were hydrated for a period of 30 days in distilled water and were then desiccated to a constant weight. Total of fifteen specimens were thermocycled for 100 and 300 hours (4000-12000 cycle) between water baths of 5-55 degrees C. Changes from baseline colour readings were recorded at each interval. Data were analysed with descriptive statistic, repeated measured analysis of variance and single factor analysis of variance. The colour changes for all materials at 100 hours were in the categories of slight, based upon the National Bureau of Standard System (NBS) for expressing colour difference. At 300 hours, the colour changes of materials were significantly different (p = 0.0001). All the materials tested showed clinically acceptable discolouration values.
authors.affiliation: Marmara Universitesi Dis Hekimligi Fakültesi, Güzelbahçe, Istanbul, Turkey. yasyas@superonline.com
authors.forename: Y
authors.initials: Y
authors.lastname: Ozkan
authors.forename: A
authors.initials: A
authors.lastname: Arikan
authors.forename: B
authors.initials: B
authors.lastname: Akalin
authors.forename: T
authors.initials: T
authors.lastname: Arda
mesh_terms: D003116:Color; D003764:Dental Materials / Q000737:chemistry; D003819:Denture Bases; D006358:Hot Temperature / Q000009:adverse effects; D008422:Materials Testing / Q000379:methods; D019904:Polymethyl Methacrylate / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry*
chemical_list: D003764:Dental Materials; D012117:Resins, Synthetic; C438105:acetalic resin, Acetal-Dental; D019904:Polymethyl Methacrylate