Papers Proceedings »
Effect of Different Impression Techniques on Accuracy in Multiple Implants
Purpose: The aim of this study was to evaluate the accuracy of multiple implant impressions by determining the effect of different implant impression techniques and splinting materials. Material and methods: Four implants were placed to the planned positions in the mandible master model parallelly. Sixty five impressions were made with polyvinyl siloxane impression material, using the indirect impression technique (ITT group), the direct impression technique (DIT group), the splinted direct impression technique with flowable composite (FCS-DIT group),the splinted direct impression technique with cold-cure acrylic resin (CARS-DIT), or the splinted direct impression technique with pattern resin (PRS-DIT group); n = 13 per group. In splinted techniques, the splints were sectioned after 24 hours and reattached. The master model and all sixty five duplicate models and were scanned with a 3D scanner. Linear and angular displacements between the master and duplicate models are recorded. Data were statistically analyzed with two-way multivariate analysis of variance test and Multiple comparisons were made using Bonferroni correction. Results: The average angular deviation value obtained with the indirect technique was higher than that of the other methods. There were no significant differences between the other methods in terms of angular deviation. The average linear displacement value obtained with the indirect method was higher than that obtained using the direct method. There were no significant differences between the other methods in terms of linear displacement. Conclusions: None of the impression technique or any splint material could provide the exact transfer of the parallel implants to the master model. The indirect impression technique resulted in the worst accuracy. The non-splinted and splinted direct impression techniques showed the best accuracy.