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Fused Filament Fabrication (FFF) of Metal-Ceramic Components

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Published on: January 11, 2019

Fracture behaviour of zirconia FPDs substructures.

W Kou¹, G Sjögren

¹Dental Materials Science, Faculty of Medicine, Umeå University, Umeå, Sweden. wen.kou@odont.umu.se

Journal of Oral Rehabilitation

|January 21, 2010

Summary

Machining creates grinding grooves on yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) fixed partial dentures (FPDs). Fractures initiate at the pontic

Area of Science:

Biomaterials Science
Dental Materials
Mechanical Engineering

Background:

Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) is a common material for dental prosthetics.
Machining processes can introduce surface flaws that may compromise material integrity.
Understanding fracture mechanics in Y-TZP fixed partial dentures (FPDs) is crucial for clinical longevity.

Purpose of the Study:

To assess superficial flaws on heat-treated, machined Y-TZP FPD substructures after manufacturing.
To identify the origin and propagation path of fractures in these substructures under load.
To correlate machining-induced flaws with fracture initiation sites.

Main Methods:

Four three-unit, hot isostatic pressed (HIPed) Y-TZP FPD substructures were examined.

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Fluorescent penetrant testing was used to detect surface flaws post-machining.

Fractured specimens were analyzed using stereomicroscopy and scanning electron microscopy (SEM) to identify fracture features.

Main Results:

Machining resulted in visible grinding grooves on the Y-TZP FPD substructures.
No other superficial flaws were detected using fluorescent penetrant methods.
Fracture analysis revealed characteristic features like arrest lines and fracture origins.
Fracture initiation was consistently observed at the gingival embrasure of the pontic, associated with a grinding groove.

Conclusions:

Grinding grooves on machined Y-TZP FPDs are a significant finding.
The gingival embrasure of the pontic is a critical area susceptible to tensile stress during occlusal loading.
Fracture initiation in these specific FPD substructures is likely linked to grinding grooves in this vulnerable region.