title: Effect of Intermixing Brands on the Dimensional Accuracy of Master Cast using Putty-wash Impression Technique.
abstract: OBJECTIVE
  The aim of this study was to evaluate the effect of intermixing brands of addition silicone impression materials on the dimensional accuracy of stone models using two-step putty-wash technique.
  
  
  METHODS
  Two common brands of addition silicone impression material (Express and Aquasil) were used in this study. A total of 40 impressions of a stainless steel model simulating a three-unit bridge were made, 10 impressions for each group. Accuracy was assessed by measuring two dimensions (inter-abutment and intra-abutment) on stone models obtained from impressions of the stainless steel model. Each sample was measured thrice and the mean value was calculated. The data were analyzed using analysis of variance (ANOVA) and Scheffe'spost hoctest.
  
  
  RESULTS
  The results indicated that each of the inter-abutment and intra-abutment dimensions of the stone models was significantly higher than those for the stainless steel model (p < 0.001). However, there was no statistically significant difference in each of the inter-abutment and intra-abutment dimensions of the stone models among the four tested groups (p < 0.05).
  
  
  CONCLUSIONS
  The results obtained were statistically analyzed and the values of the inter-abutment and intra-abutment dimensions were all within the clinically acceptable range.
  
  
  CONCLUSIONS
  Intermixing brands of additional silicone impression materials evaluated in this study did not affect the dimensional accuracy of obtained stone casts. This will help to minimize the wastage of materials due to lack of either light or putty consistency of the same brand of additional silicone impression material.
authors.affiliation: Department of Restorative Dentistry, Rutgers School of Dental Medicine, Rutgers University, Newark, New Jersey, USA.
authors.forename: Mohammed E
authors.initials: ME
authors.lastname: Sayed
authors.affiliation: Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Kingdom of Saudi Arabia.
authors.forename: Mohammed E
authors.initials: ME
authors.lastname: Sayed
authors.affiliation: Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Kingdom of Saudi Arabia, Phone: +00966568557923, e-mail: makramani@yahoo.com.
authors.forename: Bandar Ma
authors.initials: BM
authors.lastname: Al-Makramani
authors.affiliation: Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Kingdom of Saudi Arabia.
authors.forename: Fuad A
authors.initials: FA
authors.lastname: Al-Sanabani
authors.affiliation: Department of Prosthetic Dental Sciences, College of Dentistry, Jazan University, Jazan, Kingdom of Saudi Arabia.
authors.forename: Mohamed S
authors.initials: MS
authors.lastname: Mohamed
mesh_terms: D045424:Complex Mixtures / Q000737:chemistry; D003760:Dental Impression Materials / Q000737:chemistry*; D003761:Dental Impression Technique; D008422:Materials Testing; D003765:Models, Dental; D011145:Polyvinyls; D012828:Silicones / Q000737:chemistry*; D012833:Siloxanes; D013193:Stainless Steel; D013499:Surface Properties
chemical_list: D045424:Complex Mixtures; D003760:Dental Impression Materials; D011145:Polyvinyls; D012828:Silicones; D012833:Siloxanes; C480691:aquasil; D013193:Stainless Steel
keywords: Dimensional accuracy; Impression materials Putty-wash.