title: Color change evaluation of denture soft lining materials in coffee and tea.
abstract: This study evaluated the color stability of soft denture liners after being exposed to coffee and tea solutions for different time periods. Four soft denture liners and a denture base polymer were tested. Five specimens of each material were immersed in either coffee or tea solution at 50 +/- 1 degrees C for one, three, nine, 24, 48, and 96 hours. Color measurements were made using a reflectance spectrophotometer before and after the specimens were exposed to the solutions. After 96 hours' immersion in coffee and tea solutions, coffee produced more marked color changes than did tea for all the materials tested. Surface roughness (Ra) of the materials after being cured against a stainless steel surface was also measured with a contact-type surface roughness measuring instrument. Due to the different surface structures, which thus accounted for the different Ra values, the materials behaved differently when immersed in different solutions.
authors.affiliation: Gazi University, Faculty of Dentistry, Department of Prosthodontics, Ankara, Turkey. serraoguz@hotmail.com
authors.forename: Serra
authors.initials: S
authors.lastname: Oğuz
authors.forename: Mustafa Murat
authors.initials: MM
authors.lastname: Mutluay
authors.forename: Orhan Murat
authors.initials: OM
authors.lastname: Doğan
authors.forename: Bülent
authors.initials: B
authors.lastname: Bek
mesh_terms: D000180:Acrylic Resins; D003069:Coffee; D003116:Color; D003124:Colorimetry; D003822:Denture Liners; D008422:Materials Testing; D017646:Organosilicon Compounds; D044367:Phase Transition; D013499:Surface Properties; D013662:Tea
chemical_list: D000180:Acrylic Resins; D003069:Coffee; D017646:Organosilicon Compounds; D013662:Tea