title: A Comparison of Dimensional Accuracy of Addition Silicone of Different Consistencies with Two Different Spacer Designs - In-vitro Study.
abstract: BACKGROUND
  Dimensional accuracy of impression materials is crucial for the production of working casts in Fixed Prosthodontics. The accurate replication of tooth preparations and their arch position requires impression materials that exhibit limited distortion.
  
  
  METHODS
  This study was conducted to comparatively evaluate the dimensional accuracy of additional silicones by comparing two different techniques and spacer designs, by measuring the linear changes in interpreparation distance. The impressions were made from a stainless steel master die simulating a three unit bridge. A total 80 die stone (type IV, Ultrarock) models were obtained from the impressions made using two different parameters. The two different parameters are Multimix and Monophasic technique and different spacer designs.
  
  
  RESULTS
  The interpreparation distance of the abutments in the casts was measured using a travelling microscope. Each sample was measured thrice and the mean value was calculated. The results obtained were statistically analysed and the values fall within the clinically acceptable range.
  
  
  CONCLUSIONS
  The most accurate combination is multimix technique with spacer design which uses less bulk of impression material.
authors.affiliation: Senior Lecturer, Department of Prosthodontics, Thai Moogambigai Dental College & Hospital , Chennai, India .
authors.forename: Suprabha
authors.initials: S
authors.lastname: Rathee
authors.affiliation: Senior Lecturer, Department of Prosthodontics, Thai Moogambigai Dental College & Hospital , Chennai, India .
authors.forename: B
authors.initials: B
authors.lastname: Eswaran
authors.affiliation: Senior Lecturer, Department of Prosthodontics, Thai Moogambigai Dental College & Hospital , Chennai, India .
authors.forename: Ma
authors.initials: M
authors.lastname: Eswaran
authors.affiliation: Reader, Department of Prosthodontics, Thai Moogambigai Dental College & Hospital , Chennai, India .
authors.forename: R
authors.initials: R
authors.lastname: Prabhu
authors.affiliation: Reader, Department of Prosthodontics, Thai Moogambigai Dental College & Hospital , Chennai, India .
authors.forename: Kr
authors.initials: K
authors.lastname: Geetha
authors.affiliation: Senior Lecturer, Department of Prosthodontics, Thai Moogambigai Dental College & Hospital , Chennai, India .
authors.forename: Gp
authors.initials: G
authors.lastname: Krishna
authors.affiliation: Lecturer, Department of Prosthodontics, Thai Moogambigai Dental College & Hospital , Chennai, India .
authors.lastname: Jagadeshwari
keywords: Dimensional accuracy; Fixed partial denture; Polyvinyl siloxane