title: Evaluation of impression accuracy for implant at various angulations.
abstract: OBJECTIVE
  The purpose of this study was to compare 2 splinted impression transfer techniques for implant-supported prostheses.
  
  
  METHODS
  A metal matrix (control) with 4 implants was used. The implants were positioned at 90, 80, 75, and 65 degrees in relation to the surface of the matrix. Squared impression copings were splinted with self-curing acrylic resin in group 1 (n = 10) and with condensation silicone in group 2 (n = 10). A computer software was used to measure the implants/analogs inclinations. Data were analyzed by 2-way analysis of variance and Tukey test (alpha <0.05).
  
  
  RESULTS
  There was significant difference between groups, implant/analog inclinations, and interaction between them (P < 0.05). Group 1 had no significant difference from the control (P > 0.05) nor from group 2 (P > 0.05) regardless implant/analog inclinations. Considering implant/analog inclinations, both techniques did not differ from control group (P > 0.05), except for 75 degrees implant/analog inclinations (P < 0.05).
  
  
  CONCLUSIONS
  The results suggest that condensation silicone may not be used as an alternative splinting material. Furthermore, implant inclination may affect master cast accuracy.
authors.affiliation: Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Araçatuba Dental School, São Paulo, Brazil 16015-050. wirley@foa.unesp.br
authors.forename: Wirley Gonçalves
authors.initials: WG
authors.lastname: Assunção
authors.forename: Rebeca Cavalcante
authors.initials: RC
authors.lastname: Britto
authors.forename: Valentim Adelino
authors.initials: VA
authors.lastname: Ricardo Barão
authors.forename: Juliana Aparecida
authors.initials: JA
authors.lastname: Delben
authors.forename: Paulo Henrique
authors.initials: PH
authors.lastname: dos Santos
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D002133:Calcium Sulfate / Q000737:chemistry; D015921:Dental Implants; D003760:Dental Impression Materials / Q000737:chemistry; D003761:Dental Impression Technique / Q000592:standards*; D003764:Dental Materials / Q000737:chemistry; D017267:Dental Prosthesis Design; D006801:Humans; D006813:Humidity; D003765:Models, Dental; D012828:Silicones / Q000737:chemistry; D012984:Software; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D015921:Dental Implants; D003760:Dental Impression Materials; D003764:Dental Materials; D012828:Silicones; D002133:Calcium Sulfate