Effect of Storage Media on The Retention of PEEK and TESSERA Vonlays (In Vitro)

Document Type : Original Article

Authors

1 Msc Student, Nahda University Beni Suef

2 Professor, Fixed Prosthodontics, Faculty of Dentistry , Cairo University

3 Associate Professor, Fixed Prothodontics, Faculty of Dentistry, Lecturer At Fixed Prosthodontics, Minia University

10.21608/edj.2025.410346.3577

Abstract

ABSTRACT
Introduction: the long-term success of indirect restorations such as vonlays depends significantly on their retention, which may be influenced by the restorative material and the oral environment. Polyetheretherketone (PEEK) and TESSERA, an advanced hybrid ceramic, are emerging materials in indirect restorations. Understanding how storage media simulating oral conditions affect their retention is essential for clinical predictability.
Objectives: The aim of this study is to evaluate the effect of storage media on the retention of PEEK and TESSERA vonlays.
Materials and methods: A total of 36 vonlay samples were prepared and divided into two main equal groups. Group A was fabricated of CEREC Tessera™ blocks, while Group B (was constructed using breCAM.BioHPP bredent milling disk. Each group was further split into three subgroups based on the type of storage medium: one subgroup P1: vonlay samples control group ,(P2) was immersed in an acidic solution, and the last subgroup (P3) was stored in artificial saliva. The samples were subjected to thermal aging. The Retention was measured after cementation using a universal testing machine.
Results: TESSERA vonlays revealed statistically significant higher retention compared with the PEEK vonlays before immersion and after immersion in acid and saliva.
Conclusion: Vonlays are a conservative and biologically compatible option for restoring endodontically treated premolars. PEEK and TESSERA showed significant differences in retention, indicating material-specific performance under different storage media.

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Egyptian Dental Journal
Volume 71, Issue 4 - Serial Number 4
Fixed Prosthodontics, Removable Prosthodontics and Dental Materials
October 2025
Pages 3371-3386

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