title: Surface roughness and bacterial adherence to resin composites and ceramics.
abstract: OBJECTIVE
  The aim of this study was to evaluate the surface roughness and the in vitro adherence of Streptococcus mutans to indirect aesthetic restorative materials that are uncoated with saliva.
  
  
  METHODS
  Four groups of restorative materials were evaluated according to material type: (1) microparticulate feldspathic ceramic; (2) leucite-reinforced feldspathic ceramic; (3) microhybrid resin composite and (4) microfilled resin composite. Twenty standardised samples of each material were produced. Roughness analysis (Ra, n = 10) was performed using a roughness analyser. Adhesion tests (n = 10) were carried out in 24-well plates; colony-forming units (CFU/mL) were evaluated. The mean values of roughness (microm) and adherence (CFU/mL) for each group were subjected to an analysis of variance and a Tukey test.
  
  
  RESULTS
  The leucite-reinforced feldspathic ceramic was rougher and presented higher bacterial adherence than the microparticulate feldspathic ceramic. The resin composites were similar with regard to surface roughness and bacterial adherence.
  
  
  CONCLUSIONS
  The microhybrid and microfilled resin composites were similar and the leucite-reinforced feldspathic ceramic was rougher and presented higher bacterial adherence than the microparticulate feldspathic ceramic.
authors.affiliation: Division of Periodontology, Department of Stomatology, School of Dentistry, Federal University of Santa Maria, Rua Marechal Floriano 1184, 97015-372 Santa Maria, Brazil.
authors.forename: Karla Zanini
authors.initials: KZ
authors.lastname: Kantorski
authors.forename: Roberto
authors.initials: R
authors.lastname: Scotti
authors.forename: Luiz Felipe
authors.initials: LF
authors.lastname: Valandro
authors.forename: Marco Antonio
authors.initials: MA
authors.lastname: Bottino
authors.forename: Cristiane Yumi
authors.initials: CY
authors.lastname: Koga-Ito
authors.forename: Antonio Olavo
authors.initials: AO
authors.lastname: Jorge
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D001422:Bacterial Adhesion / Q000502:physiology*; D002516:Ceramics / Q000737:chemistry; D015169:Colony Count, Microbial; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003776:Dental Porcelain / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D017680:Potassium Compounds / Q000737:chemistry; D013295:Streptococcus mutans / Q000502:physiology*; D013499:Surface Properties
chemical_list: D000538:Aluminum Silicates; D003188:Composite Resins; D003764:Dental Materials; C075815:IPS-Empress ceramic; D017680:Potassium Compounds; C477352:Sinfony composite resin; D003776:Dental Porcelain; C016447:feldspar; C078519:leucite