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

Dentistry 3000

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Title Influence of occlusal anatomy on acrylic resin CAD/CAM crowns fracture load and stress distribution.
Creator Borges, Alexandre Luiz Souto
de Lima, Aline Lins
Campaner, Larissa Mendes
Bottino, Marco Antonio
Dal Piva, Amanda Maria de Oliveira
Tribst, João Paulo Mendes
Subject prosthodontics
Finite Element Analysis; Computer-Aided Design; Crowns; Acrylic Resins; Weight-Bearing
Description 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.
Publisher University Library System, University of Pittsburgh
Contributor São Paulo Research Foundation (FAPESP) with the grants nº 2013/14831-1 and nº 2014/00668-4.
Date 2021-05-06
Type info:eu-repo/semantics/article

in vitro; in silico
Format application/pdf
Source Dentistry 3000; Vol 9, No 1 (2021); 36-45
Language eng
Rights Copyright (c) 2021 Alexandre Luiz Souto Borges, Aline Lins de Lima, Larissa Mendes Campaner, Marco Antonio Bottino, Amanda Maria de Oliveira Dal Piva, João Paulo Mendes Tribst

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