title: Effects of organic-inorganic hybrid coating on the color stability of denture base resins.
abstract: BACKGROUND
  Denture base resin may be exposed to different conditions for long periods, resulting in varying degrees of staining, discoloration, and distortion.
  
  
  OBJECTIVE
  The purpose of this in vitro study was to evaluate whether an organic-inorganic hybrid coating for base resins can improve color stability and reduce water absorption and solubility.
  
  
  METHODS
  An organic-inorganic hybrid coating was prepared, and resin sheets made from 4 types of base resin materials were divided into an experimental group (surface coating) and a control group (without coating). The water absorption and solubility in each group were tested. The resin sheets were immersed in tea, red wine, coffee, and cola. The color change (ΔE values) of resin sheets in different soaking solutions was evaluated at 1, 7, and 28 days.
  
  
  RESULTS
  Statistical analysis showed that water absorption and solubility in the experimental group were significantly lower than in the control group (P<.05). The 4 staining solutions (tea, red wine, coffee, and cola) caused base resin discoloration in a time-dependent manner. This staining and discoloration was also influenced by the type of resin material. About 85% of ΔE values in the experimental group were significantly lower than those in the control group (P<.05). At 28 days, almost all ΔE values in the experimental group were significantly lower than those in the control group (P<.05).
  
  
  CONCLUSIONS
  The organic-inorganic hybrid coating effectively reduced the water uptake and solubility of base resins and significantly improved the color stability of the denture base.
authors.affiliation: Graduate student, Department of Prosthodontic Dentistry, Hospital of Stomatology, Jilin University, Changchun, Jilin, People's Republic of China.
authors.forename: Weiwen
authors.initials: W
authors.lastname: Zuo
authors.affiliation: Graduate student, Department of Prosthodontic Dentistry, Hospital of Stomatology, Jilin University, Changchun, Jilin, People's Republic of China.
authors.forename: Dan
authors.initials: D
authors.lastname: Feng
authors.affiliation: Graduate student, Department of Prosthodontic Dentistry, Hospital of Stomatology, Jilin University, Changchun, Jilin, People's Republic of China.
authors.forename: Aiyang
authors.initials: A
authors.lastname: Song
authors.affiliation: Graduate student, Department of Prosthodontic Dentistry, Hospital of Stomatology, Jilin University, Changchun, Jilin, People's Republic of China.
authors.forename: Haihuan
authors.initials: H
authors.lastname: Gong
authors.affiliation: Professor, Department of Prosthodontic Dentistry, Hospital of Stomatology, Jilin University, Changchun, Jilin, People's Republic of China. Electronic address: zhusong1965@163.com.
authors.forename: Song
authors.initials: S
authors.lastname: Zhu
mesh_terms: D000180:Acrylic Resins; D003069:Coffee; D003116:Color; D003188:Composite Resins; D003819:Denture Bases; D008422:Materials Testing; D013499:Surface Properties; D013662:Tea; D014867:Water
chemical_list: D000180:Acrylic Resins; D003069:Coffee; D003188:Composite Resins; D013662:Tea; D014867:Water