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- Title
Effect of supporting dies’ mechanical properties on fracture behavior of monolithic zirconia molar crowns.
- Authors
Yutao JIAN; Tianyi ZHANG; Xiaodong WANG; Laina KYAW; Edmond Ho Nang POW; Ke ZHAO
- Abstract
The aim of this study was to investigate the effects of supporting dies with different mechanical properties on the fracture strengths and failure modes of monolithic zirconia crowns, and identify a suitable die material for testing high-strength ceramic restorations. Thirty six dies from teeth, porous titanium and composite-resin with 36 zirconia crowns were fabricated based on 3D model. Crowns were cemented, then underwent load-to-fracture testing. Fractographic analysis was performed with scanning electron microscopy, and finite element analysis was made. During loading, a high stress concentration zone formed near the loading point and on surface of die. Cracks generated on failure penetrated the crown and extended to die in 9 teeth group specimens, while compositeresin samples exhibited fracture of both crowns and dies. All dies remained intact in porous titanium group. Fracture mode was undistinguishable in all groups. It was concluded that porous titanium appears suitable as die material for dental restorations with high fracture strength.
- Subjects
DENTAL crowns; MATERIALS testing; FRACTOGRAPHY; TITANIUM group; FRACTURE strength
- Publication
Dental Materials Journal, 2022, Vol 41, Issue 2, p249
- ISSN
0287-4547
- Publication type
Article
- DOI
10.4012/dmj.2021-090