title: Shear bond strength of denture teeth to two chemically different denture base resins after various surface treatments.
abstract: OBJECTIVE
  Debonding of acrylic teeth from the denture base remains a major problem in prosthodontics. The objective of this study was to evaluate the effect of various surface treatments on the shear bond strength of the two chemically different denture base resins-polymethyl methacrylate (PMMA) and urethane dimethacrylate (UDMA).
  
  
  METHODS
  Two denture base resins, heat-cured PMMA (Meliodent) and light-activated UDMA (Eclipse), were used in this study. A total of 60 molar acrylic denture teeth were randomly separated into four groups (n = 15), according to surface treatment: acrylic untreated (group AC), Eclipse untreated (group EC), treated with eclipse bonding agent (group EB), and Er:YAG laser-irradiated eclipse (group EL). Shear bond strength test specimens were prepared according to the manufacturers' instructions. Specimens were subjected to shear bond strength test by a universal testing machine with a 1 mm/min crosshead speed. The data were analyzed with one-way ANOVA and post hoc Tukey-Kramer multiple comparison tests (α = 0.05).
  
  
  RESULTS
  The highest mean bond strength was observed in specimens of group EB, and the lowest was observed in group EC specimens. A statistically significant difference in shear bond strength was found among all groups (p < 0.001), except between groups EC and EL (p = 0.61).
  
  
  CONCLUSIONS
  The two chemically different denture base polymers showed different shear bond strength values to acrylic denture teeth. Laser-irradiation of the adhesive surface was found to be ineffective on improving bond strength of acrylic denture teeth to denture base resin. Eclipse bonding agent should be used as a part of denture fabrication with the Eclipse Resin System.
authors.affiliation: Associate Professor, Cumhuriyet University, Faculty of Dentistry, Department of Prosthodontics, Sivas, Turkey.
authors.forename: Hakan
authors.initials: H
authors.lastname: Akin
authors.forename: Faik
authors.initials: F
authors.lastname: Tugut
authors.forename: Umit
authors.initials: U
authors.lastname: Guney
authors.forename: Turker
authors.initials: T
authors.lastname: Akar
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry* / Q000528:radiation effects; D003188:Composite Resins / Q000737:chemistry / Q000528:radiation effects; D001840:Dental Bonding; D003764:Dental Materials / Q000737:chemistry* / Q000528:radiation effects; D003799:Dental Stress Analysis / Q000295:instrumentation; D003819:Denture Bases; D006801:Humans; D053844:Lasers, Solid-State; D008422:Materials Testing; D008689:Methacrylates / Q000737:chemistry* / Q000528:radiation effects; D008768:Methylmethacrylates / Q000737:chemistry / Q000528:radiation effects; D019904:Polymethyl Methacrylate / Q000737:chemistry* / Q000528:radiation effects; D011140:Polyurethanes / Q000737:chemistry* / Q000528:radiation effects; D011897:Random Allocation; D033081:Shear Strength; D013314:Stress, Mechanical; D013499:Surface Properties; D014093:Tooth, Artificial
chemical_list: D000180:Acrylic Resins; D003188:Composite Resins; D003764:Dental Materials; C509237:Eclipse Prosthodontic Resin; D008689:Methacrylates; D008768:Methylmethacrylates; D011140:Polyurethanes; C091555:Meliodent; C029824:urethane dimethacrylate luting resin; D019904:Polymethyl Methacrylate
keywords: Eclipse; Er:YAG laser; PMMA; UDMA; shear bond strength