Accuracy of Polyvinyl Siloxane Impression Material with Different Inter Implant Angulation

The suitability of a recommended material for implant impressions and the effects of implant angulation on the accuracy of the working cast remain debatable. Thus, evaluating the effect of impression materials with different implant angulations on the accuracy of impression is important (Cehreli et al. , 2006). Four block shaped acrylic master models were fabricated with two implant analogs in each the first was placed at 0 angulation (reference implant) while the second was at 0, 5, 10, and 15 respectively. Sixty-four impressions were taken, 16 impressions for each of the four master casts, eight of them made using Aquasil impression material and the other eight impressions with Virtual impression material. IBM SPSS v.22 (SPSS Inc, Chicago) was demonstrated. according to the results material elasticity and inter-implant angulation had a combined effect on the accuracy of the implant impression (p =0.03). The inter-implant angulations were significantly associated with the impression accuracy (p= 0.027) regardless of the elasticity of the material. Post-hoc analysis using Tamhanes procedure showed a significant difference between angulation pairs of 0 - 10 and 0 - 15. The study demonstrated that the interaction between PVS impression materials of different elasticity (Virtual and Aquasil medium body) and the inter implant angulation of the analogs placed divergently produced a significant adverse effect on the impression accuracy. Regardless of material elasticity, the angulation of the implant analogs also adversely affects the impression accuracy