Effect of Filler Type, Content, and Silanization on the Flexural Strength, Elastic Modulus, Shore D Hardness, and Two-Body Wear of PAEK Compounds

Schmeiser, Felix; Schramm, Wofgang; Mayinger, Felicitas; Baumert, Uwe; Stawarczyk, Bogna (2025): Effect of Filler Type, Content, and Silanization on the Flexural Strength, Elastic Modulus, Shore D Hardness, and Two-Body Wear of PAEK Compounds. Materials, 18 (12): 2736. ISSN 1996-1944

Abstract

The aim of this study was to evaluate the influence of filler type, filler content, and filler silanization on the flexural strength (FX), elastic modulus (Em), shore D hardness (SDH), and two-body wear (2BW) of polyaryletherketone (PAEK) compounds. Specimens (40 wt% PEEK, 40 wt% PEK) with different filler types: 20 wt%: fumed silica (FS), calcium silicate (CS), feldspar (FP), magnesium silicate hydrate (MSH), no filler (NF); different filler content: 20, 25 or 30 wt% CS; different filler silanization: 20 wt% CS silanized with alkylsilane/aminosilane, FP silanized with methylsilane/ vinylsilane, no silanization; and PEEK20 (BioHPP) or PEEK25 (BioHPP plus) controls were fabricated and tested for FX, Em, and SDH. Two-body wear (4 × 100,000 cycles, 50 N, 2.5 Hz) with composite resin antagonists was measured with PAEKi (35 wt% PEEK, 35 wt% PEK, 30 wt% CS), PAEKii (70 wt% PEEK, 30 wt% CS), PAEKiii (70 wt% PEEK, 25 wt% CS, 5 wt% FP), and PEEK20 controls. Data were analyzed with Kolmogorov–Smirnov-, Kruskal–Wallis-H-, post hoc Scheffé test, pairwise comparisons, Bonferroni correction, one-way ANOVA, and Spearman rho (α = 0.05). An abrasion area analysis was performed. Adding filler increased FX, Em, and SDH, with CS and MSH showing the highest values for FX and Em. Adding 30 wt% CS increased FX, Em, and SDH compared with 20 wt%. Silanization with methylsilane increased FX, Em, and SDH. Silanization with aminosilane increased FX and SDH. PEEK20 showed the lowest 2BW compared with all EPCs. No material losses were detected on the antagonists. PAEK compounds with 25 to 30 wt% CS increased FX and Em compared to lower contents, no filler, or PEEK20. Higher values of FX and Em did not lead to lower 2BW.

• Dokumententyp: Artikel (Klinikum der LMU)
• Organisationseinheit (Fakultäten): 07 Medizin > Klinikum der LMU München > Poliklinik für Zahnärztliche Prothetik
• DFG-Fachsystematik der Wissenschaftsbereiche: Lebenswissenschaften