Effect Of Three Different Bar Clip Materials on Retention of Implant-Supported Mandibular Overdenture: An Invitro Study

Document Type : Original Article

Authors

1 Teaching Assistant, Removable Prosthodontics, Faculty of Dentistry, Nahda University

2 Fellow of the General Organization for Teaching Hospitals and Institutes

3 Lecturer, Prosthodontics Department, Faculty of Dentistry, Minia University.

4 Associate Professor, Prosthodontics Department, Faculty of Dentistry Minia university, Egypt

Abstract

The aim: To explore the effect of different bar clip materials (plastic, poly ether ether ketone (PEEK), and zirconia) on retention force with PEEK bar in implant supported mandibular overdenture using the universal testing machine.
Materials and methods: A heat-cured acrylic educational model was constructed and to implants were inserted at the canine region bilaterally. A milled PEEK bar was constructed and screwed to the multiunit abutment which were screwed to the implants. Three different clip materials groups (plastic, PEEK, and zirconia) were constructed. The clips were picked up in the intaglio surface of each denture. Three wrought wires were attached to the overdenture polished surface and connected to each other at the overdenture geometric center. The retention force of each attachment was measured at T0 (insertion) followed by T1 at 360 (3 months), T2 at 720 (6 months), T3 at 1440 (one year), T4 at 2880 (2 years) and T5 at 4320 (3 years) insertion and removal cycles simulating 36 months of usage.
Results: A statistically significant difference was found between clip materials at all insertion and removal cycles. The final mean retention force of the zirconia clip group was significantly lower compared to the plastic and PEEK clip groups at T5 simulating 3-year usage.
Conclusion: Within the limitations of this study, it can be concluded that the PEEK and plastic clip materials showed significantly higher retention values compared to zirconia clip materials when used with PEEK bar-retained mandibular implant-supported overdentures after a three-year simulation of overdenture use.

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Egyptian Dental Journal
Volume 70, Issue 1 - Serial Number 4
January (Fixed Prosthodontics, Removable Prosthodontics and Dental Materials)
January 2024
Pages 473-486

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