الفهرس 
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Abstract
Bar attachments are the preferred choice for implant tissue-supported overdentures because to their superior durability and enhanced mechanical stability compared to individual attachments.
Zirconium bar is a ceramic material that is used as a bonded mandibular fixed retainer. It is known for its excellent aesthetics, high mechanical strength, exceptional biocompatibility, and resistance to wear. It is commonly used in medical equipment. Various materials, including metal alloys and ceramics, have been proposed for the production of implant superstructures. Utilize various materials such as metal, zirconium, peek, titanium, Cobalt-Chromium (Co-Cr), and resin to construct female components for bars.
The objective of this study is to assess the adhesion of (zirconium bar) to polyether-ether ketone (PEEK), zirconium, and titanium frameworks.
An assessment was conducted on the stability of a removable denture that was fully supported by a milled bar attached to four dental implants, placed at the canine and premolar positions on both sides of the mouth. The denture was secured using several materials for the framework, namely zirconia, peek, and titanium. The maximum load at a speed of 50 N was measured before and after 3250 cycles of insertion and removal for each type of material using a universal testing equipment.
Prior to the insertion cycles, the Zircon bar & PEEK framework exhibited the highest retention, whereas the Zircon bar & zircon framework showed much lower retention values. The Zircon bar & titanium framework had the lowest retention forces.
Following multiple insertion cycles, the Zircon bar & PEEK framework exhibited the highest retention, while the Zircon bar & titanium framework had significantly lower retention values. The Zircon bar & zircon framework demonstrated the lowest retention forces.
To summarize, zirconium bar exhibits substantially greater retention forces when utilized with PEEK frameworks in comparison to other test groups. However, it demonstrates a notable decrease in this force over a period of three years after overdenture usage.