title: Roughness of denture materials: a comparative study.
abstract: OBJECTIVE
  Surface properties of denture materials are of clinical importance since they may affect plaque accumulation and staining. This in vitro study investigated the roughness of 20 commercially available denture materials.
  
  
  METHODS
  Four denture base resins, nine hard lining materials, and seven soft denture lining materials were evaluated for roughness. Roughness measurements were made using a Mitutoyo Surftest SV-400, and the mean arithmetic roughness values (Ra) obtained were used for the comparisons.
  
  
  RESULTS
  The overall Ra values ranged from 0.7 to 7.6 microns. The denture base materials group exhibited Ra values from 3.4 to 7.6 microns, whereas the hard liners were from 0.7 to 4.4 microns. The autopolymerized and visible light-cured soft liners presented Ra values from 0.7 to 3.5 microns, while the heat-cured soft liners ranged from 3.5 to 4.0 microns.
  
  
  CONCLUSIONS
  The roughness exhibited by all of the materials tested (Ra values greater than 0.7 micron) indicates that there is a possibility for plaque accumulation, since 0.2 micron is considered the threshold below which no further bacterial adherence can be expected.
authors.affiliation: Department of Removable Prosthodontics, Dental School, University of Athens, Greece.
authors.forename: A J
authors.initials: AJ
authors.lastname: Zissis
authors.forename: G L
authors.initials: GL
authors.lastname: Polyzois
authors.forename: S A
authors.initials: SA
authors.lastname: Yannikakis
authors.forename: A
authors.initials: A
authors.lastname: Harrison
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000704:Analysis of Variance; D001422:Bacterial Adhesion; D003116:Color; D003764:Dental Materials / Q000737:chemistry*; D003773:Dental Plaque / Q000382:microbiology; D003819:Denture Bases / Q000382:microbiology; D003822:Denture Liners / Q000382:microbiology; D004129:Dimethylpolysiloxanes / Q000737:chemistry; D006801:Humans; D008027:Light; D008422:Materials Testing; D008768:Methylmethacrylates / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D011109:Polymethacrylic Acids / Q000737:chemistry; D011140:Polyurethanes / Q000737:chemistry; D011205:Povidone / Q000737:chemistry; D012117:Resins, Synthetic / Q000737:chemistry*; D012826:Silicone Elastomers / Q000737:chemistry; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins; C078088:Astron LC; D003764:Dental Materials; D004129:Dimethylpolysiloxanes; C020964:MDX 4-4210; D008768:Methylmethacrylates; D011108:Polymers; D011109:Polymethacrylic Acids; D011140:Polyurethanes; D012117:Resins, Synthetic; D012826:Silicone Elastomers; C060386:Triad resin; C078089:PERform Soft; C043896:Duragel 75; C029883:Trevalon universal; D011205:Povidone