title: Influence of finishing/polishing on color stability and surface roughness of composites submitted to accelerated artificial aging.
abstract: OBJECTIVE
  To assess the influence of finishing/polishing procedure on color stability (ΔE ) and surface roughness (R(a)) of composites (Heliomolar and Tetric - color A2) submitted to accelerated artificial aging (AAA).
  
  
  METHODS
  Sixty test specimens were made of each composite (12 mm × 2 mm) and separated into six groups (n = 10), according to the type of finishing/polishing to which they were submitted: C, control; F, tip 3195 F; FF, tip 3195 FF; FP, tip 3195 F + diamond paste; FFP, tip 3195 FF + diamond paste; SF, Sof-Lex discs. After polishing, controlled by an electromechanical system, initial color (spectrophotometer PCB 6807 BYK GARDNER) and R(a) (roughness meter Surfcorder SE 1700, cut-off 0.25 mm) readings were taken. Next, the test specimens were submitted to the AAA procedure (C-UV Comexim) for 384 hours, and at the end of this period, new color readings and R(a) were taken.
  
  
  RESULTS
  Statistical analysis [2-way analysis of variance (ANOVA), Bonferroni, P < 0.05] showed that all composites demonstrated ΔE alteration above the clinically acceptable limits, with the exception of Heliomolar composite in FP. The greatest ΔE alteration occurred for Tetric composite in SF (13.38 ± 2.10) statistically different from F and FF (P < 0.05). For R(a), Group F showed rougher samples than FF with statistically significant difference (P < 0.05).
  
  
  CONCLUSIONS
  In spite of the surface differences, the different finishing/polishing procedures were not capable of providing color stability within the clinically acceptable limits.
authors.affiliation: Department of Dental Materials and Prosthodontics, Ribeirão Preto Dental School, São Paulo University, Ribeirão Preto, SP, Brazil.
authors.forename: Gustavo Da Col dos Santos
authors.initials: Gda C
authors.lastname: Pinto
authors.forename: Kleber Campioni
authors.initials: KC
authors.lastname: Dias
authors.forename: Diogo Rodrigues
authors.initials: DR
authors.lastname: Cruvinel
authors.forename: Lucas da Fonseca Roberti
authors.initials: Lda F
authors.lastname: Garcia
authors.forename: Simonides
authors.initials: S
authors.lastname: Consani
authors.forename: Fernanda de Carvalho Panzeri
authors.initials: Fde C
authors.lastname: Pires-De-Souza
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D003116:Color; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003775:Dental Polishing; D008422:Materials Testing; D011140:Polyurethanes / Q000737:chemistry*; D013053:Spectrophotometry; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D003764:Dental Materials; C513708:Heliomolar; D011140:Polyurethanes; C090969:Tetric