title: In situ evaluation of a new silorane-based composite resin's bioadhesion properties.
abstract: OBJECTIVE
  The aim of the present study was to compare, in situ, the initial dental plaque formation on a recently developed silorane-based composite resin, Filtek Silorane, and on a widely used methacrylate-based composite resin, Synergy D6, and to relate possible differences to surface free energy, hydrophobicity and type of organic matrix.
  
  
  METHODS
  Discs of Filtek Silorane and Synergy D6 were prepared and polished equally in order to attain the same surface roughness. Water, formamide and 1-bromonaphthalene contact angles were determined and the surface free energy and the hydrophobicity of the materials calculated. Two discs of each material were mounted in individual oral splints and exposed to the oral cavity of 20 participants for 4h. After this period the microbial adhesion to both materials' surface was measured by two different approaches, the DAPI staining and the plate count. Statistical analysis was performed using non-parametric tests.
  
  
  RESULTS
  The surface roughness (R(a) parameter) was similar between the two materials and lower than 0.2μm. Mean water and formamide contact angles were significantly higher for Filtek Silorane, which presented significantly lower surface free energy and greater degree of hydrophobicity in comparison to Synergy D6. The bioadhesion potential evaluated by either DAPI staining or plate count did not differ between the two materials.
  
  
  CONCLUSIONS
  In contrast to previous in vitro studies, the present in situ study found no statistically significant differences with respect to bacterial adhesion between Filtek Silorane and Synergy D6, despite the differences found for surface free energy and hydrophobicity.
authors: Faculty of Dental Medicine, University of Porto, Rua Dr. Manuel Pereira da Silva, Porto, Portugal.
authors: Diogo
authors: D
authors: Claro-Pereira
authors: Benedita
authors: B
authors: Sampaio-Maia
authors: Carla
authors: C
authors: Ferreira
authors: Andreia
authors: A
authors: Rodrigues
authors: Luís F
authors: LF
authors: Melo
authors: Mário R
authors: MR
authors: Vasconcelos
mesh_terms: D001422:Bacterial Adhesion / Q000502:physiology; D058491:Bacterial Load; D018441:Biofilms; D002175:Candida / Q000502:physiology; D015169:Colony Count, Microbial; D003188:Composite Resins / Q000737:chemistry*; D003764:Dental Materials / Q000737:chemistry*; D003773:Dental Plaque / Q000382:microbiology*; D005260:Female; D005456:Fluorescent Dyes; D005559:Formamides / Q000737:chemistry; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D007211:Indoles; D007778:Lactobacillus / Q000502:physiology; D008297:Male; D008422:Materials Testing; D009281:Naphthalenes / Q000737:chemistry; D062047:Silorane Resins; D012833:Siloxanes / Q000737:chemistry*; D013291:Streptococcus / Q000502:physiology; D013295:Streptococcus mutans / Q000502:physiology; D013499:Surface Properties; D013500:Surface Tension; D013997:Time Factors; D014867:Water / Q000737:chemistry; D017155:Wettability; D055815:Young Adult
chemical_list: D003188:Composite Resins; D003764:Dental Materials; D005456:Fluorescent Dyes; D005559:Formamides; D007211:Indoles; D009281:Naphthalenes; D062047:Silorane Resins; D012833:Siloxanes; C452441:Synergy composite resin; C555513:silorane composite resin; D014867:Water; C031721:naphthalene; C007293:DAPI; C031066:formamide