title: [Surface characteristics of the acrylic resins according to the polishing methods].
abstract: OBJECTIVE
  The objective of this study was to evaluate the effect of the polishing technique and glazing on the porosity of the dental resins.
  
  
  METHODS
  The studied resins were: Castapress/Vertex, Prothyl Hot/Zermack, Rapid Simplified/Vertex, Duracryl Plus/Spofa Dental, Vertex-Soft/Vertex, Superacryl Plus/Spofa Dental. Thirty specimens, five for every resin, of 50/25/2 cm in size were done. One surface of each sample was polished with extrahard tungsten carbide burs, the other surface being polished with extrahard extrafine and diamond burs. The final polishing was done using a conventional method: pumice, water and lathe bristle brush for 90 seconds, 1500 rpm and soft leather polishing wheel for 90 seconds, 3000 rpm. Twenty surfaces were glazed after polishing with Glaze/Bosworth. Vertex Soft specimens were not polished because this is a resilient material. Surface porosity of the acrylic resin specimens was measured by optical microscopy.
  
  
  RESULTS
  The lowest porosity was obtained by conventional polishing combined with glazing techniques. No differences between glazed and non/glazed self-curing resin specimens were noticed, but there were differences between self-curing and heat-curing resins.
  
  
  CONCLUSIONS
  Conventional lathe polishing method is an effective and reliable technique for polishing dental resins. Specimens of self-curing resin had a higher porosity than heat curing resin following the same surface treatment. Higher surface smoothness was obtained by conventional lathe polishing completed by glazing.
authors.affiliation: Universitatea de Medicină şi Farmacie Gr. T. Popa Iaşi, Facultatea de Medicină, Departamentul de Tehnologie Denţara.
authors.forename: Anca Mihaela
authors.initials: AM
authors.lastname: Vitalariu
authors.forename: Lenuţa
authors.initials: L
authors.lastname: Lazăr
authors.forename: Tinca
authors.initials: T
authors.lastname: Buruiană
authors.forename: Diana
authors.initials: D
authors.lastname: Diaconu
authors.forename: Monica Silvia
authors.initials: MS
authors.lastname: Tatarciuc
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D003775:Dental Polishing / Q000379:methods; D003819:Denture Bases; D008855:Microscopy, Electron, Scanning; D013499:Surface Properties
chemical_list: D000180:Acrylic Resins