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The impacts of microstructures and airborne-particle abrasion on the additively manufactured zirconia bond strength with and without thermocycling.

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Title: The impacts of microstructures and airborne-particle abrasion on the additively manufactured zirconia bond strength with and without thermocycling.
Authors: Wang, Mengwei1 (AUTHOR), Liu, Jiabao1 (AUTHOR), Xu, Boxuan1 (AUTHOR), Lin, Wei-Shao2 (AUTHOR), Tan, Jianguo1 (AUTHOR), Chen, Li1 (AUTHOR) lichen@pku.edu.cn
Source: Dental Materials. Apr2026, Vol. 42 Issue 4, p578-585. 8p.
Subjects: Microstructure, Bond strengths, Rapid prototyping, Zirconium oxide, Resin adhesives, Thermocycling, Surface topography, Abrasive blasting
Abstract: To evaluate effects of additively manufactured microstructures, airborne-particle abrasion (APA), and thermocycling on zirconia-resin shear bond strength (SBS). Zirconia discs (N = 280) with microarchitectures of varying protrusion coverage (30 %, 50 %, 70 %) and height (50 μm, 100 μm), along with a non-textured control, were fabricated using Advanced Customized Jetting (ACJ). Specimens were assigned to groups based on APA treatment and thermocycling (15,000 cycles, 5–55 °C). Surface topography was evaluated through contour maps and roughness parameters. After bonding specimens to resin columns (Clearfil AP-X) using light-cured resin cement (Clearfil SA Luting), SBS was tested and analyzed using stepwise linear regression. Failure modes were classified via stereomicroscopy and analyzed using chi-square tests. Microstructured groups exhibited significantly higher SBS than controls (P < 0.001), with height (β=0.769) and APA (β=0.268) as key predictors (adjusted R²=0.660). The 50 % proportion/100 µm height/APA group achieved the highest SBS (6.78 ± 0.82 MPa pre-aging; 6.25 ± 0.83 MPa post-aging) and a low adhesive failure rate. Thermocycling increased adhesive failures (P < 0.001) without affecting SBS (P = 0.954). Additively manufactured microstructures, particularly those with 50 % proportion, 100 µm height and APA treatment, significantly enhance zirconia-resin bond strength and durability, offering a promising strategy for improving clinical retention of zirconia restorations. • Microstructures on irregular curve surfaces were designed and fabricated, enhancing bonding strength while maintaining surface integrity. • Adhesive properties of advance customized jetting, a new 3D-printing technology, were explored, complementing existing mechanical property studies. • Advanced surface analysis using Rku and Rsk parameters reveals how microstructural morphology affects adhesive performance. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:To evaluate effects of additively manufactured microstructures, airborne-particle abrasion (APA), and thermocycling on zirconia-resin shear bond strength (SBS). Zirconia discs (N = 280) with microarchitectures of varying protrusion coverage (30 %, 50 %, 70 %) and height (50 μm, 100 μm), along with a non-textured control, were fabricated using Advanced Customized Jetting (ACJ). Specimens were assigned to groups based on APA treatment and thermocycling (15,000 cycles, 5–55 °C). Surface topography was evaluated through contour maps and roughness parameters. After bonding specimens to resin columns (Clearfil AP-X) using light-cured resin cement (Clearfil SA Luting), SBS was tested and analyzed using stepwise linear regression. Failure modes were classified via stereomicroscopy and analyzed using chi-square tests. Microstructured groups exhibited significantly higher SBS than controls (P < 0.001), with height (β=0.769) and APA (β=0.268) as key predictors (adjusted R²=0.660). The 50 % proportion/100 µm height/APA group achieved the highest SBS (6.78 ± 0.82 MPa pre-aging; 6.25 ± 0.83 MPa post-aging) and a low adhesive failure rate. Thermocycling increased adhesive failures (P < 0.001) without affecting SBS (P = 0.954). Additively manufactured microstructures, particularly those with 50 % proportion, 100 µm height and APA treatment, significantly enhance zirconia-resin bond strength and durability, offering a promising strategy for improving clinical retention of zirconia restorations. • Microstructures on irregular curve surfaces were designed and fabricated, enhancing bonding strength while maintaining surface integrity. • Adhesive properties of advance customized jetting, a new 3D-printing technology, were explored, complementing existing mechanical property studies. • Advanced surface analysis using Rku and Rsk parameters reveals how microstructural morphology affects adhesive performance. [ABSTRACT FROM AUTHOR]
ISSN:01095641
DOI:10.1016/j.dental.2025.11.018