Mechanical properties, biosafety, and shearing bonding strength of glass fiber-reinforced PEEK composites used as post-core materials

Ting Zhao; Zilong Jiang; Yongcheng Ge; Haoyu Yin; Qi Yang; Ruozhu Li; Zheng Chen; Haibo Zhang; Xiaoqiu Liu

doi:10.1016/j.jmbbm.2023.106047

Mechanical properties, biosafety, and shearing bonding strength of glass fiber-reinforced PEEK composites used as post-core materials

J Mech Behav Biomed Mater. 2023 Sep:145:106047. doi: 10.1016/j.jmbbm.2023.106047. Epub 2023 Jul 27.

Authors

Ting Zhao¹, Zilong Jiang², Yongcheng Ge¹, Haoyu Yin¹, Qi Yang¹, Ruozhu Li³, Zheng Chen², Haibo Zhang⁴, Xiaoqiu Liu⁵

Affiliations

¹ Department of Geriatric Dentistry, Hospital of Stomatology, Jilin University, China.
² National and Local Joint Engineering Laboratory for Synthetic Technology of High-Performance Polymer, College of Chemistry, Jilin University, China.
³ Department of Pediatric Dentistry, Hospital of Stomatology, Jilin University, China.
⁴ National and Local Joint Engineering Laboratory for Synthetic Technology of High-Performance Polymer, College of Chemistry, Jilin University, China. Electronic address: zhanghaib@jlu.edu.cn.
⁵ Department of Geriatric Dentistry, Hospital of Stomatology, Jilin University, China. Electronic address: xqliu@jlu.edu.cn.

PMID: 37523841
DOI: 10.1016/j.jmbbm.2023.106047

Abstract

Objective: To investigate the mechanical properties, biosafety, and shearing bonding strength of glass fibers-reinforced polyether-ether-ketone (PEEK-GF) for post-core materials.

Methods: PEEK-GF composites with different glass fiber contents were prepared by extrusion injection and named PEEK-GF30, PEEK-GF40, and PEEK-GF50. Mechanical properties including flexural modulus, flexural strength, Vickers hardness, and compression strength were tested. The cross-sectional morphology was examined using scanning electron microscopy (SEM). Cytotoxicity was studied in vitro with Cell-counting kit-8 (CCK-8). Cell morphology was observed under a microscope. Cell growth on the composites' surfaces was analyzed with DAPI staining. The shearing bonding strength (SBS) of PEEK-GF50 was assessed after applying different pretreatments. Failure modes were evaluated by microscopy. SEM and contact-angle measurements were performed on the surfaces. Statistical analysis was conducted using one-way ANOVA (P < 0.05).

Results: The mechanical properties of PEEK-GF composites improved with increased GF content. The PEEK-GF50 group exhibited flexural modulus (17.4 ± 0.5 GPa) close to that of dentin (18.6 GPa) and showed the highest flexural strength (350.0 ± 2.9 MPa), Vickers hardness (47.6 ± 4.5 HV), and compressive strength (264.0 ± 18.0 MPa). The SEM analysis demonstrated that the PEEK matrix combined well with glass fibers. The CCK-8 results confirmed the biosafety of all groups. DAPI staining indicated that cells were growing well on the composites' surface. The sample that was pretreated with sandblasting and plasma showed the highest SBS (16.0 ± 1.7 MPa).

Significance: The PEEK-GF composites demonstrated excellent mechanical properties, biosafety, and SBS, and have great potential to serve as post-core materials.

Keywords: Dental; Glass fiber; PEEK; Post-core.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Composite Resins
Containment of Biohazards*
Cross-Sectional Studies
Glass
Ketones
Materials Testing
Polyethylene Glycols
Surface Properties

Substances

polyetheretherketone
fiberglass
Polyethylene Glycols
Ketones
Composite Resins