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The Effect of Impression Technique, Connection Type and Implant Angulation on Impression Accuracy

Title of Thesis: “The Effect of Impression Technique, Connection Type and Implant Angulation on Impression Accuracy” Joanna Kempler, DDS Thesis Directed by: Dr. Radi Masri Assistant Professor Department of Endodontics, Prosthodontics and Operative Dentistry Baltimore College of Dental Sugery University of Maryland Purpose: To measure the accuracy of implant impression techniques in vitro, using open and closed tray techniques with internal and external connection implants at various angulations. Materials and Methods: Three internal connection implants and three external connection implants were placed in an acrylic master cast as follows from posterior to anterior: 90, 15 and 30 degrees. Twenty-four open tray and closed tray impressions were made and the resulting casts were analyzed using digital photography. The following measurements were performed (1) horizontal displacement; (2) vertical displacement; (3) angulation displacement in the lateral view; (4) angulation displacement in the frontal view. Statistical analysis was completed by using a factorial analysis of variance (threeway ANOVA). A p value ≤0.05 was considered significant. Tukey’s HSD test was used to analyze significant differences for the angulation variable.