title: Thickness and marking quality of different occlusal contact registration strips.
abstract: OBJECTIVE
  Evaluate the thickness and the marking quality of different occlusal contact registration strips (OCRS) and a possible correlation between them.
  
  
  METHODS
  The following OCRS were selected: Accufilm II, BK20, BK21, BK22, BK23, BK28, and BK31. The thickness was measured in three points of the OCRS with an electronic measuring device (TESA), and the mean was calculated. To produce the marks on the strips, composite resin specimens were adapted to a universal testing machine (Versat 2000) with 40 kgf load cell at a speed of 1.0 mm/min. The mark images were photographed with a stereoscopic microscope (Stemi SV11) and processed and analyzed by the 550-Leica Qwin analyzer.
  
  
  RESULTS
  Values (μm) found in the 1st and 2nd thickness measurements were: Accufilm II - 16.4 and 14.2; BK20 - 10.0 and 8.1; BK21 - 9.5 and 8.0; BK22 - 9.7 and 8.7; BK23 - 9.8 and 7.9; BK28 - 12.8 and 10.0; and BK31 - 8.4 and 8.0, respectively. The mean (mm2) values found in the mark areas were: Accufilm II - 0.078; BK20 - 0.035; BK21 - 0.045; BK22 - 0.012; BK23 - 0.022; BK28 - 0.024; and BK31 - 0.024. The results were submitted to the Kruskal-Wallis (p<0.05) and Pearson's correlation tests.
  
  
  CONCLUSIONS
  Only in the 2nd measurement, the OCRS thickness observed was similar to the value indicated by the manufacturers; the Accufilm II and the BK28 strips showed the better marks; and no correlation was found between the thickness and the marking area.
authors.affiliation: São Paulo, São Paulo, SP, Brazil.
authors.forename: Maria Fernanda de Souza Mauá Serapião
authors.initials: MF
authors.lastname: Toledo
authors.affiliation: Department of Bioscience and Oral Diagnosis, School of Dentistry, Science and Technology Institute, Univ. Estadual Paulista, São José dos Campos, SP, Brazil.
authors.forename: Renata Pilli
authors.initials: RP
authors.lastname: Jóias
authors.affiliation: São Paulo, São Paulo, SP, Brazil.
authors.forename: Yves Santini
authors.initials: YS
authors.lastname: Marques-Iasi
authors.affiliation: Department of Dentistry, University of Taubaté, Taubaté, SP, Brazil.
authors.forename: Ana Christina Claro
authors.initials: AC
authors.lastname: Neves
authors.affiliation: Department of Dental Materials and Prosthodontics, School of Dentistry, Science and Technology Institute, Universidade Estadual Paulista, São José dos Campos, SP, Brazil.
authors.forename: Sigmar de Mello
authors.initials: Sde M
authors.lastname: Rode
mesh_terms: D000704:Analysis of Variance; D003764:Dental Materials; D003766:Dental Occlusion; D007091:Image Processing, Computer-Assisted; D007574:Jaw Relation Record / Q000295:instrumentation* / Q000379:methods; D008422:Materials Testing; D012016:Reference Values; D018709:Statistics, Nonparametric; D013499:Surface Properties
chemical_list: D003764:Dental Materials