Comparative Evaluation of the Dimensional Accuracy of Multiple Implant Impressions Using 3 Different Impression Materials Analyzed Immediately, After 24 Hours & After 2 Pours – An In-Vitro Study.
Journal Title: International Journal of Dental Science and Innovative Research (IJDSIR) - Year 2019, Vol 2, Issue 2
Abstract
Objectives: The accuracy of the definitive cast to a large extent is dependent on the impression technique, impression material, splinting (if used), and cast material in order to achieve passively fitting implant – retained prosthesis. This in vitro study aimed to comparatively evaluate the dimensional accuracy of multiple implant impressions using 3 different impression materials assessed at various time intervals. Materials and methods: 3 groups using Addition Silicone, Condensation Silicone and polyether impression materials were further divided into 2 subgroups each, as splinted open and non-splinted closed tray in each group. Thus, 90 impressions were made with the splinted open tray impression technique using perforated rigid custom made trays and dental floss and pattern resin as splinting materials, and 90 with non-splinted closed tray technique using perforated metal stock trays. Measurements of the inter-implant distances on the working casts in three dimensions were obtained by rapid photometer and the differences calculated in relation to the reference model. Results: The dimensional accuracy of Addition Silicone elastomeric impression material was significantly better at immediate and after 24 hour pour followed by Polyether and least for Condensation Silicone(P<0.001). On the other hand, after 2 pours the dimensional accuracy of Polyether was significantly better followed by Addition Silicone and least for Condensation Silicone. (P<0.001) Conclusion: Addition Silicone was the better impression material followed by polyether for a situation of multiple implants. Polyether was stable and suitable for multiple pours. The open tray was better for a situation of multiple implants than closed tray impression technique.
Authors and Affiliations
Dr Karunakar Shetty
Keywords
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