European Journal of Prosthodontics and Restorative Dentistry

Prosthetic Maintenance Assessment for Two Implant- Retained Overdentures Reinforced with PEKK Versus Co-Cr Framework: A Randomized Controlled Clinical Trial

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Cover Date

September 2024

Print ISSN

0965-7452

Electronic ISSN

2396-8893

Vol

32

Issue

3

Abstract

European Journal of Prosthodontics and Restorative Dentistry (2024) 32, 356–364

Keywords
Dental Implants
Overdenture
Maintenance/Standards
Computer-Aided Design-ComputerAided Manufacturing

Authors
Heba A. Salama *

(Doctor of Medicine in Oral and
Maxillofacial Prosthodontics)

Omnia M. Refai §

(Doctor of Medicine in Oral and
Maxillofacial Prosthodontics)

Address for Correspondence
Heba A. Salama *
Email: [email protected]
* Lecturer of Prosthodontics, Faculty of Oral and
Dental Medicine, Misr International University,
Cairo, Egypt
Lecturer of Oral and Maxillofacial
Prosthodontics, Faculty of Dentistry, Ain Shams
University, Cairo, Egypt

§

Prosthetic Maintenance
Assessment for Two ImplantRetained Overdentures
Reinforced with PEKK
Versus Co-Cr Framework:
A Randomized Controlled
Clinical Trial
ABSTRACT
Introduction: The primary challenge associated with implant overdentures lies in the
occurrence of denture fractures around the attachments. Hence, it is recommended to
enhance flexural strength through reinforcement frameworks. This study aimed to assess
and compare the prosthetic maintenance of mandibular implant overdentures reinforced
with Co-Cr and PEKK frameworks. Methods: Twenty-four participants with completely
edentulous ridges were selected, and two implants were placed at the mandibular canine
areas. After osseointegration period, ball attachments were installed. Participants were
randomly assigned into two groups: Group I received a mandibular implant overdenture
reinforced with a Co-Cr framework, while Group II received a mandibular implant overdenture reinforced with a PEKK framework. Prosthetic maintenance evaluations were
conducted in both groups twelve months post-denture insertion. Categorical data were
analyzed, and results were presented as frequency and percentage values. Results: Group
II exhibited a significantly higher percentage of cases with screw looseness, denture
relining, and tooth separation compared to Group I. Although Group II cases showed a
non-significant increase in the percentage of insert wear and retention loss. Conclusion:
Within the limitations of this study, the findings suggest that Co-Cr, in contrast to PEKK
frameworks, offers a more reliable reinforcement of the implant-retained overdentures.

INTRODUCTION
Complete denture rehabilitation remains one of the most prevalent conventional prosthodontic treatment options for edentulous patients with systemic, anatomic, or socioeconomic constraints.1 Complaints from complete
denture wearers typically concern the insufficient retention and stability of
the mandibular complete denture, which are attributed to the absence of
a peripheral seal, reduced surface area, and the presence of the tongue.2
To address these issues, dental implants are currently regarded as one of
the crucial treatment modalities for rehabilitating partially and completely

Received: 18.04.2024
Accepted: 28.06.2024
doi: 10.1922/EJPRD_2715Salama09

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