title: Discoloration of provisional restorations after oral rinses.
abstract: OBJECTIVE
  Oral rinses are widely used to promote periodontal health with provisional restorations during the interim period. The aim of this study was to compare the discoloration of provisional restoration materials with different oral rinses.
  
  
  METHODS
  A total of 140 disc-shaped specimens (shade A2) (10 mm x 2 mm) were prepared from one PMMA-based (TemDent Classic(®)) and three different bis-acrylic-based (Protemp II(®), Luxatemp(®) and Fill-In(®)) provisional restoration materials (n=7). The color values (L*, a*, and b*) of each specimen were measured before and after exposure with a colorimeter, and the color changes (∆E) were calculated according to the CIE L*a*b* system. The specimens were immersed in each of the 4 oral rinses (alcohol-containing mouthwash, chlorhexidine, benzydamine HCl, benzydamine HCl and chlorhexidine) twice a day for 2 minutes. After 2 minutes of immersion in the oral rinses, the specimens were immersed in artificial saliva. The specimens were exposed to the oral rinses and the artificial saliva for 3 weeks. Two-way ANOVA, the Bonferroni test and the paired sample t-test were used for statistical analyses (p<0.05).
  
  
  RESULTS
  Comparison of the discoloration from the oral rinses after immersion for three weeks revealed no significant differences (p>0.05). The lowest color change was observed in PMMA-based Temdent in all oral rinses (p<0.05). There were no significant differences between the bis-acryl composites after immersion in saliva or the mixture of benzydamine HCl and chlorhexidine and the alcohol-containing mouthwash for 3 weeks (p>0.05). After immersion in chlorhexidine, the color change values of Protemp II and Fill-in showed significant differences (p=0.018). Protemp II also showed less discoloration than the other bis-acryl composites, and this color change was statistically significant (p <0.05). For all oral rinses, the L* value decreased while b* values increased, and this color change was found to be statistically significant (p <0.05). A* values were found to be significantly higher with oral rinses (p<0.05), except Protemp II immersed in benzydamine HCl or alcohol-containing mouthwash.
  
  
  CONCLUSIONS
  The type of the oral rinse did not affect the discoloration process. For long-term esthetic results, choosing MMA-based materials for provisional restorations appears to be more effective.
authors.affiliation: 1. DDS, PhD, Department of Prosthodontics, Faculty of Dentistry, Karadeniz Technical University, Trabzon, Turkey;
authors.forename: Sedanur
authors.initials: S
authors.lastname: Turgut
authors.forename: Bora
authors.initials: B
authors.lastname: Bagis
authors.forename: Elif Aydogan
authors.initials: EA
authors.lastname: Ayaz
authors.forename: Kıvanç Utku
authors.initials: KU
authors.lastname: Ulusoy
authors.forename: Subutay Han
authors.initials: SH
authors.lastname: Altintas
authors.forename: Fatih Mehmet
authors.initials: FM
authors.lastname: Korkmaz
authors.forename: Nilsun
authors.initials: N
authors.lastname: Bagis
mesh_terms: D001591:Benzydamine / Q000737:chemistry; D002710:Chlorhexidine / Q000737:chemistry; D006801:Humans; D009067:Mouthwashes / Q000737:chemistry*; D012463:Saliva / Q000737:chemistry
chemical_list: D009067:Mouthwashes; D001591:Benzydamine; D002710:Chlorhexidine
keywords: 'CIE, Commission Internationale de l'Eclairage'; 'HCL, Hydrochloride'; MMA, Methyl methacrylate').; discoloration, provisional restorations, oral rinses. ('PMMA, Polymethyl methacrylate'
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