European Journal of Prosthodontics and Restorative Dentistry

Effect of Arch Size and Implant Angulations on the Accuracy of Implant Impressions


Purpose: To evaluate the effects of arch size and implant angulation on the accuracy of implant impressions. Materials and Methods: Four different resin models (small and large) of edentulous maxilla were fabricated and four implants were inserted (Blossom®, Ø 4.75 × 10 mm) in each model. Implants were either parallel or angled 25° buccally. Forty working casts (small parallel, small angled, large parallel, and large angled) were fabricated in dental stone (n=10). For each implant, linear and angular displacements were measured using a coordinate-measuring machine (CMM) and mean values were analyzed by univariate analysis (α = 0.05). Results: Arch size did not affect the linear or angular displacement (P > .05). However, the implant angulation had a marked influence on the linear displacement (P < .05). The largest linear displacement occurred in implant no. 4 of angled small groups. Conclusion: Regardless of arch size, linear and angular accuracy of implant impression varied with the implant angulation.
Impression Accuracy
Dental Implant
Angled Implant
Arch Size


Leila Payaminia, Leyla Sadighpour, Hadi Kamali, Farideh Geramipanah, Susan Mirmohammad Rezaei

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