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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Effect of occlusal anatomy of CAD/CAM feldspathic posterior crowns in the stress concentration and fracture load

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Souto Borges, Alexandre Luiz [1] ; Mendes Tribst, Joao Paulo [1] ; de Lima, Aline Lins [1] ; de Oliveira Dal Piva, Amanda Maria [1] ; Ozcan, Mutlu [2]
Total Authors: 5
[1] Sao Paulo State Univ UNESP, Inst Sci & Technol, Dept Dent Mat & Prosthet, Sao Jose Dos Campos - Brazil
[2] Univ Zurich, Ctr Dent & Oral Med, Div Dent Biomat, Clin Reconstruct Dent, Plattenstr 11, CH-8032 Zurich - Switzerland
Total Affiliations: 2
Document type: Journal article
Web of Science Citations: 0

Objectives: This study evaluated the effect of restoration occlusal design on the maximum fracture load and stress distribution of a feldspathic ceramic crown. Materials and Methods: Twenty dentin analogues were used to simulate a full-crown preparation. Next, 20 feldspathic crowns were milled according to the occlusal design parameter available in the CAD database (Young or Adult). The crowns were cemented with dual cure resin-cement and loaded until fracture at 1 mm/min cross-head speed. Data were analyzed by using one-way ANOVA and Tukey tests (p < 0.05). The same geometry and experimental setup was modeled and exported to the computer aided engineering software and tensile stress concentration was calculated using the finite element method with 300 N occlusal load simulation. Results: The occlusal anatomy significantly influenced the load-to-fracture (p < 0.05). Adult design showed higher mean values (1149 +/- 201 N) than Young design (454 +/- 77 N). The maximum principal stress criteria showed similar stress pattern for both designs, however, the highest stress concentration was calculated for Young design (91 MPa) in the occlusal surface. Conclusions: An anatomy design with reduced cusp angulation and less evident occlusal sulcus can reduce the stress concentration and increase the fracture load for feldspathic CAD/CAM posterior crowns. (AU)

FAPESP's process: 13/14831-1 - The influence of cuspal angle and material toughness on stress distribution and fracture resistance of total crown
Grantee:Aline Lins de Lima
Support type: Scholarships in Brazil - Master
FAPESP's process: 14/00668-4 - Influence of occlusal anatomy, resin cements properties and connectors type on the strength and stress distribution in metal free prostheses
Grantee:Alexandre Luiz Souto Borges
Support type: Regular Research Grants