Shear bond strength of different luting agents to polyether ether ketone

Abstract

Background: Polyether ether ketone (PEEK) was recently introduced to dentistry. However,
difficulty in provision of a strong durable bond is its main drawback. Thus, precise surface treatment
and use of a suitable luting agent are imperative for bonding of PEEK restorations. This study aimed
to assess the effect of type of luting agent on shear bond strength (SBS) of PEEK.
Materials and Methods: In this in vitro study, 60 square‑shaped PEEK samples were fabricated
and sandblasted with 110 μm Al2O3 particles. The samples were then divided into four groups
based on the type of cement used (n = 15): zinc phosphate cement, Panavia F2, Panavia V5, and
resin‑modified glass‑ionomer (RMGI) cement. After bonding, the samples were thermocycled for
5000 cycles. The SBS was measured by a universal testing machine. The surface of samples was
inspected under a video measuring machine to determine the mode of failure. Data were analyzed
using the Kruskal–Wallis test via SPSS version 24 (α = 0.05).
Results: RMGI did not bond to PEEK. The SBS values were 4.02 ± 2.87 megapascals (MPa) for
Panavia V5, 10.84 ± 6.05 MPa for Panavia F2, and 10.50 ± 2.88 MPa for zinc phosphate. The SBS
in the Panavia V5 group was significantly lower than that in the Panavia F2 (P = 0.001) and zinc
phosphate (P < 0.001) groups. No significant difference existed between the Panavia F2 and zinc
phosphate groups in this respect (P > 0.05).
Conclusion: Panavia F2 resin cement and zinc phosphate conventional cement provided the
highest bond strength to PEEK, while RMGI did not bond to PEEK.
Key Words: Dental cement, glass‑ionomer cement, resin cement, shear strength