In vitro retention force changes during cyclic dislodging of three novel attachment systems for implant overdentures with different implant angulations

• Published in: Clinical oral implants research 2020-04, Vol.31 (4), p.315-327
• Main Authors: Maniewicz, Sabrina, Badoud, Isabelle, Herrmann, François R., Chebib, Najla, Ammann, Patrick, Schimmel, Martin, Müller, Frauke, Srinivasan, Murali
• Format: Article
• Language: English
• Subjects: Computer simulation; Dental implants; Dental Prosthesis, Implant-Supported; Dental Stress Analysis; Dentistry; Denture Retention; Denture, Overlay; Dentures; Implants; Mandible; material sciences; Mathematical models; morphometric analysis; prosthodontics; Regression analysis; Regression models; Retention; Statistical analysis; Statistical models
• ISSN: 0905-7161; 1600-0501
• DOI: 10.1111/clr.13567

Objectives This in vitro study aimed to compare changes in retentive force due to cyclic dislodging of three novel un‐splinted attachments. Materials and Methods Experimental models simulating a mandibular two‐implant overdenture situation, with implants positioned with various interimplant discrepancies (0°, 20°, 40°, and 60°) were fabricated. Three attachment systems were tested, “N”: a straight or 15°‐angulated stud; “L”: a sole straight stud; and “C”: a straight or individually angulated stud. All models underwent wet testing and were subjected to 10,000 insertion–removal cycles in a universal testing machine. The mean retentive forces were calculated for cycles 10, 100, 1,000, 5,000, and 10,000. Multiple mixed‐effects linear regression models were applied for statistical analyses (⍺