Influence of occlusal anatomy on acrylic resin CAD/CAM crowns fracture load and stress distribution.

Autori

  • Alexandre Luiz Souto Borges Department of Dental Material and Prosthodontics, São Paulo State University, Institute of Science and Technology – São José dos Campos, SP, Brazil. http://orcid.org/0000-0002-5707-7565
  • Aline Lins de Lima Department of Dental Material and Prosthodontics, São Paulo State University, Institute of Science and Technology – São José dos Campos, SP, Brazil. http://orcid.org/0000-0003-3105-5541
  • Larissa Mendes Campaner Department of Dental Material and Prosthodontics, São Paulo State University, Institute of Science and Technology – São José dos Campos, SP, Brazil. http://orcid.org/0000-0002-3262-2379
  • Marco Antonio Bottino Department of Dental Material and Prosthodontics, São Paulo State University, Institute of Science and Technology – São José dos Campos, SP, Brazil. http://orcid.org/0000-0003-0077-3161
  • Amanda Maria de Oliveira Dal Piva Department of Dental Material and Prosthodontics, São Paulo State University, Institute of Science and Technology – São José dos Campos, SP, Brazil. http://orcid.org/0000-0003-3105-5541
  • João Paulo Mendes Tribst Department of Dental Material and Prosthodontics, São Paulo State University, Institute of Science and Technology – São José dos Campos, SP, Brazil. https://orcid.org/0000-0002-5412-3546

DOI:

https://doi.org/10.5195/d3000.2021.118

Parole chiave:

Finite Element Analysis, Computer-Aided Design, Crowns, Acrylic Resins, Weight-Bearing

Abstract

Objectives: This study compared the influence of occlusal anatomy on acrylic CAD/CAM crowns fracture load and stress distribution. The null hypothesis was that there would be no difference between the provisional crowns fracture load and stress according to different occlusal anatomy.

Methods: A full-crown preparation was simulated using dentin analogue (G10, Protec, São Paulo, Brazil) totaling 20 identical preparations. Next, twenty acrylic crowns were milled using different occlusal design parameter (Young or Adult) available in the software database. The crowns were cemented (Temp-bond, NE Kerr Dental, Brea, CA, USA) and fractured using a compressive load (0.5 mm/min of cross-head speed). Data were analyzed by using one-way ANOVA and Tukey tests (p< 0.05). A similar geometry was modeled and exported to the analysis software to perform a static structural analysis. The maximum principal stress was calculated using the finite element method with 300 N chewing load simulation.

Results: The occlusal anatomy significantly influenced the load-to-fracture (p<0.05). Young design showed lower fracture load (1139±132 N) than Adult design (2007±345 N). The tensile stress distribution showed a similar pattern for both groups however the highest stress peak was calculated for Young design (76 MPa) in the occlusal surface.

Conclusion: The anatomy design with higher cusp angulation and occlusal sulcus more evident can increase the stress concentration and reduce the fracture load for acrylic resin CAD/CAM crowns.

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Pubblicato

2021-05-06

Fascicolo

V. 9 N. 1 (2021)

Sezione

Adults & the Elderly

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