Retentive Characteristics of a Polyetheretherketone Post-Core Restoration with Polyvinylsiloxane Attachments.

Ping Li,Alexey Unkovskiy,Sebastian Spintzyk,Feraydoon Sharghi,Dorina Hasselbeck

doi:10.3390/polym12092005

Abstract

A new application of a polyetheretherketone (PEEK) post-core restoration combined with polyvinylsiloxane (PVS) attachments was proposed and substantiated. This study aimed to evaluate retentive characteristics of the PEEK post-core restoration with PVS attachment systems. Specimens with PVS attachments were fabricated to evaluate retention force during 10,000 cyclic dislodgements. Additionally, the retention forces of PVS attachments with three different values of Shore hardness were further measured before and after aging treatments. The results of cyclic dislodgement test indicated a strong negative linear relationship between the cyclic times and retention force (p < 0.0001, r = −0.957). Furthermore, the retention forces of the PVS were significantly improved with Shore hardness increased, which was also affected by the aging treatment (F (2, 138) = 10.95, p < 0.0001). Therefore, the PEEK post-core restoration with PVS attachments exhibited the favorable retention force, which could be a promising alternative for dental prostheses.

Highlights

Edentulism and severe tooth loss affects hundreds of millions of people worldwide and compromises the normal mastication process, phonetics, and overall aesthetics [1]
The PEEK post-core restoration with PVS attachments showed the favorable retention force, which corresponds to an appropriate retention force for ten years of clinical use
The retention force of the three types of PVS attachments increased as its Shore hardness increased, which can expand clinical application in specific cases

Summary

Introduction

Edentulism and severe tooth loss affects hundreds of millions of people worldwide and compromises the normal mastication process, phonetics, and overall aesthetics [1]. Removable dental prostheses (RDPs) have been widely applied to replace the lost teeth and reestablish oral functions [2,3,4]. RDPs with attachment system exhibit superior clinical performance, due to improved stability (resistance to horizontal forces) and retention (resistance to vertical dislodgement) [5,6]. Attachment-retained RDPs demonstrated the highest rate of tooth fracture (12.7–40%), compared to clasp-retained RDPs and double crown-retained RDPs [6,7]. Considering endodontically treated teeth as an abutment, choosing materials of endodontic posts plays the predominant role to prevent the root fracture [8,9].

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Discussion

Conclusion