Objectives: A new impression procedure with disposable plastic clips as impression tubes is to be tested for its precision compared to conventional impression procedures – reposition method and pick up impression with open tray.

Methods: Impressions by the pick up procedure with the clip system (V1), the reposition procedure (V2) as well as the pick up impression procedure with open tray (V3) were made from an original model with 4 interforaminal XiVE-TG-implants. In each method 30 one-stage-impressions were made. Stone models with laboratory implants were produced. At the original model a reference implant was determined. The distance of this implant to the other implants as well as the height differences and the angles of the implant shoulders were measured 15 times and the mean values were calculated. The laboratory implants in the stone models were measured on the same way and compared to the original model. The statistical analysis was made by the Mann-Whitney-U-Test.

Results: The models fabricated by method V3 showed significant differences to the original model in the height of the implant shoulders H1, H2 and H3 as well as in the distances L2 and L3. Method V2 revealed significant differences to the original model regarding the measured values H2, H3, L2 and L3. In method V1 only the measured values L2 and L3 were significantly higher than those of the original model. The angles of the implant shoulders revealed no differences. The comparison of the impression procedures resulted in no differences between V3 and V2. However, the clip system (V1) showed significantly lower discrepancies to the original model at H2 and H3 than the other two methods.

Conclusions: The clip system is an easy-handling and cost-effective alternative to conventional methods, producing partially more exact working models according to the present investigation.

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