title: Effects of different types of temporary cements on the tensile strength and marginal adaptation of crowns on implants.
abstract: OBJECTIVE
  The aim of this study was to evaluate the influence of four different types of temporary cements, Tempbond (Kerr), Tempbond NE (Kerr), Improv (Sterioss), and Dycal (Dentsply/Caulk), on the marginal adaptation and tensile strength of prosthetic specimens cemented on replicas of CeraOne abutments.
  
  
  METHODS
  Four test groups were formed: Group 1 (G-1), Tempbond (Kerr); Group 2 (G-2), Tempbond NE (Kerr); Group 3 (G-3), Improv (Sterioss); Group 4 (G-4), Dycal (Dentsply/Caulk). For the specimens, gold cylinders (DCB 160, Nobel Biocare) adapted to stainless steel replicas of CeraOne abutments (Nobel Biocare) were utilized. The replicas on a stainless steel base were made in a special machine for implant components. The cement thicknesses for each luting agent were measured using a Measurement Comparative Microscope (Mitutoyo). The readings obtained before cementation were used as the controls (G-0). Following each group's cementation, the specimens were submitted to tensile strength tests with a Universal Testing Machine (Kratus).
  
  
  RESULTS
  The results of the marginal adaptation test as reflected by cement thicknesses were: G-0 = 11.7 microm, G-1 = 35.7 microm (+/- 8.8), G-2 = 41.7 microm (+/- 9.0), G-3 = 32.6 microm (+/- 9.7) and G-4 = 38.2 microm (+/- 6.7). The tensile strength tests yielded the following values: G-1 = 58.5 N (+/- 14.8), G-2 = 51 N (+/- 8.2), G-3 = 61.8 N (+/- 17.1) and G-4 = 71.8 N (+/- 9.3).
  
  
  CONCLUSIONS
  The four temporary cements tested all provided similar marginal adaptation. G-4 (Dycal) showed a higher tensile strength than G-2 (Tempbond NE).
authors.affiliation: Universidade Paulista, UNIP/Bauru, São Paulo, Brazil. aeakashi@uol.com.br
authors.forename: Ana Eliza
authors.initials: AE
authors.lastname: Akashia
authors.forename: Carlos Eduardo
authors.initials: CE
authors.lastname: Francischone
authors.forename: Edson
authors.initials: E
authors.lastname: Tokutsune
authors.forename: Walter
authors.initials: W
authors.lastname: da Silva
mesh_terms: D000704:Analysis of Variance; D002126:Calcium Hydroxide; D002484:Cementation; D003442:Crowns; D000044:Dental Abutments; D001840:Dental Bonding; D003738:Dental Cements; D018772:Dental Marginal Adaptation; D017268:Dental Prosthesis Retention; D019094:Dental Prosthesis, Implant-Supported; D003794:Dental Restoration, Temporary; D005054:Eugenol; D006047:Gold Alloys; D008422:Materials Testing; D008899:Mineral Oil; D008903:Minerals; D013193:Stainless Steel; D018709:Statistics, Nonparametric; D013718:Tensile Strength; D015034:Zinc Oxide
chemical_list: D003738:Dental Cements; D006047:Gold Alloys; C413303:ImProv; D008903:Minerals; C474196:Tempbond NE; D013193:Stainless Steel; D005054:Eugenol; C025702:Dycal; C076899:Temp-Bond; D008899:Mineral Oil; D002126:Calcium Hydroxide; D015034:Zinc Oxide