title: A study of the physical and chemical properties of four resin composite luting cements.
abstract: OBJECTIVE
  This study evaluated the surface microhardness and flexural and compressive strengths of five luting cements and compared the degree of conversion of dual and autopolymerized forms of four resin-based luting cements.
  
  
  METHODS
  Four resin composite luting cements-Panavia F, Variolink 2, RelyX Unicem Applicap, and RelyX ARC-and a polycarboxylate cement (Durelon, control group) were used in three-point bending, compression, and Vickers hardness tests following water storage for 1 week. Resin composite cements were additionally investigated with both dual and autopolymerization techniques under Fourier transformed infrared spectroscopy. Differences were analyzed using one-way ANOVA.
  
  
  RESULTS
  The highest flexural strengths were obtained with Variolink 2 (90 MPa, SD 22), whereas the lowest were observed with Durelon (28 MPa, SD 4). RelyX Unicem showed the highest hardness values (44 HV, SD 5), whereas Variolink 2 gave the lowest (32 HV, SD 6). The highest compressive strengths were obtained with RelyX Unicem (145 MPa, SD 32), whereas the lowest were observed with Durelon (41 MPa, SD 17). For both dual and autopolymerized groups, RelyX ARC showed the highest degrees of conversion (81% and 61%, respectively) and RelyX Unicem had the lowest (56% and 26%, respectively).
  
  
  CONCLUSIONS
  Resin composite luting cements of similar chemical characterizations differed in their physical properties, and polymerization method influenced their degree of conversion.
authors.affiliation: Department of Prosthodontics, School of Dentistry, Ege University, Izmir, Turkey. kumbuloglu@hotmail.com
authors.forename: Ovul
authors.initials: O
authors.lastname: Kumbuloglu
authors.forename: Lippo V J
authors.initials: LV
authors.lastname: Lassila
authors.forename: Atilla
authors.initials: A
authors.lastname: User
authors.forename: Pekka K
authors.initials: PK
authors.lastname: Vallittu
mesh_terms: D000704:Analysis of Variance; D017438:Bisphenol A-Glycidyl Methacrylate; D019245:Compressive Strength; D003799:Dental Stress Analysis; D006244:Hardness; D008422:Materials Testing; D015394:Molecular Structure; D044367:Phase Transition; D018583:Pliability; D011076:Polycarboxylate Cement / Q000737:chemistry; D011092:Polyethylene Glycols; D011109:Polymethacrylic Acids; D019279:Resin Cements / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: C438843:Panavia-Fluoro; D011076:Polycarboxylate Cement; D011109:Polymethacrylic Acids; C483701:Rely X Unicem; C462240:RelyX ARC; D019279:Resin Cements; C103502:Variolink; C031374:zinc polyacrylate; D011092:Polyethylene Glycols; D017438:Bisphenol A-Glycidyl Methacrylate