الفهرس | Only 14 pages are availabe for public view |
Abstract Background: Accurate recording of implant locations is required so that definitive restorations are properly supported and do not place additional stress on the implants. Angulated implants may result in inaccurate impressions, and the impression technique may affect the accuracy of the definitive cast. The aim of this study was to compare the dimensional accuracy of casts obtained from three impression techniques (indirect-, directunsplinted and direct splinted with acrylic resin-technique) for three definitive lower casts with implants at different angulations. Materials and method: Three Osseolink implants were placed in three reference models with different angles (0, 15, and 30 degrees). Thirty medium-consistency polyvinyl siloxane impressions of each model were made with three techniques (n=10 per group): (1) indirect-, (2) unsplinted directand (3) acrylic resin splinted direct technique. Impressions were poured with type IV dental stone. The inter-implant distances were measured for casts using a coordinate measuring machine and the deviations compared to the reference models were calculated. Data were analyzed using one way ANOVA followed by post-hoc tests to detect significance between groups (=0.05). Results: This study showed that the acrylic resin splinted direct technique reproduced the three-dimensional position of implants more accurately than the indirect and unsplinted direct techniques in 30 degree angulated implant situation.in 15 degree angulated implants both the acrylic resin splinted direct technique and unsplinted direct techniques were more accurate than indirect technique. While in parallel implant condition, no difference was found between all three techniques. |