Bacterial accumulation of different telescopic crowns: (PEEK) versus Cobalt-Chromium telescopes in implant-supported mandibular overdenture.

Document Type : Original Article

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Department of Prosthetic Dentistry, Faculty of Dentistry, Minia University

Abstract

Abstract
Purpose: The purpose of this study is to compare bacterial accumulation between telescopic over 
dentures fabricated by two different materials: PEEK ( Polyetheretherketone) and Cobalt-Chromium 
copings. Material &Methods: Ten completely edentulous patients were selected from the Outpatient 
Clinic of the Prosthodontics Department; Faculty of Dentistry, Minia University. Strict 
inclusion/exclusion criteria were applied. Also, all required investigations were done for all patients. 
Each patient received two implants in the canine regions bilaterally. Implants in all participating 
patients were from the same manufacture having the same design and overdenture superstructure. 
The only difference was in telescopic coping material. The patients were randomly divided according 
to type of telescopic crowns into: Group (1): Patients received overdentures with cobalt chromium 
telescopic copings (CAD/CAM wax copings were constructed then these copings were transformed to 
Co/Cr by usual casting procedures). After six months all cobalt chromium copings were replaced by 
PEEK copings. Group (2): Patients received overdentures with PEEK (polyetheretherketone ) 
telescopic copings fabricated by CAD/CAM. After six months all PEEK copings were replaced by 
cobalt chromium copings. The patients were recalled after 6 months and 1 year during which, the 
bacterial samples were isolated and the corresponding microbial alteration in the restored material 
were evaluated and data recorded and expressed as CFU/ml. Results: PEEK telescopic copings had 
greater affinity for bacterial accumulation more than metallic copings, and the differences were 
statistically significant.

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