Abstract
Statement of problem
Polyetheretherketone (PEEK) can be used as a framework material for removable and
fixed dental prostheses. However, information about the use of PEEK as a post-and-core
restoration is scarce.
Purpose
The purpose of this in vitro study was to evaluate the effect of different surface
treatments on the push-out bond strength of milled polyetheretherketone posts to resin
cement.
Material and methods
Sixty intact human maxillary central incisors were selected and endodontically treated,
and standardized post spaces were prepared. Sixty PEEK posts were milled from a prefabricated
PEEK blank by using a computer-aided design and computer-aided manufacturing (CAD-CAM)
system and divided into 3 groups (n=15) according to the surface treatment: acid etching
by using 98% sulfuric acid (AE); airborne-particle abrasion by using 50-μm Al2O3 (AA); nonthermal plasma treatment (NTP); in addition, PEEK posts (n=15) received
no treatment (NT) and served as a control. All posts were bonded by using a self-adhesive
resin cement. Three sections (coronal, middle, and apical) were obtained for each
specimen. Push-out bond strength measurements (MPa) for each section were recorded
by using a universal testing machine at a crosshead speed of 0.5 mm/min until failure
occurred. The post-cement interfaces and failure modes were evaluated by using scanning
electron microscopy. The data obtained were statistically analyzed by using 1-way
ANOVA and the pair-wise Tukey (HSD) test to study the difference between group mean
values (α=.05).
Results
The overall mean ±standard deviation of the push-out bond strength was 11 ±2 MPa for
AE group, 6 ±1 MPa for AA group, 5 ±1 MPa for NTP group, and 3 ±1 MPa for NT group.
A statistically significant difference was found among all groups subjected to different
surface treatments as indicated by the ANOVA test (P<.001). The pair-wise Tukey honestly significant difference (HSD) test showed a significant
difference among the AE group and all groups (P<.001); however, no significant difference was observed between the AA and NTP groups
(P>.05). Moreover, a significant difference was observed among all root sections (P<.001).
Conclusions
Surface treatment of PEEK posts with 98% sulfuric acid for 60 seconds showed significantly
higher bond strength values than those in other groups. The bond strength of PEEK
posts to resin cement was significantly higher in the coronal section than that in
other sections.
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Article info
Publication history
Published online: January 22, 2021
Identification
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© 2020 by the Editorial Council for the Journal of Prosthetic Dentistry.
