Amanda Maria de Oliveira Dal Piva1, João Paulo Mendes Tribst2, Alexandre Luiz Souto Borges3, Rodrigo Othávio de Assunção E Souza4, Marco Antonio Bottino5. 1. Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp), Institute of Science and Technology, Av. Eng. Francisco José Longo, no. 777, Jardim São Dimas, 12245-000, São José dos Campos, SP, Brazil. Electronic address: amanda.piva@unesp.br. 2. Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp), Institute of Science and Technology, Av. Eng. Francisco José Longo, no. 777, Jardim São Dimas, 12245-000, São José dos Campos, SP, Brazil. Electronic address: joao.tribst@ict.unesp.br. 3. Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp), Institute of Science and Technology, Av. Eng. Francisco José Longo, no. 777, Jardim São Dimas, 12245-000, São José dos Campos, SP, Brazil. Electronic address: aleborges@ict.unesp.br. 4. Federal University of Rio Grande do Norte (UFRN), Department of Dentistry, Division of Prosthodontics, Natal, RN, Brazil. Electronic address: rodrigoothavio@gmail.com. 5. Department of Dental Materials and Prosthodontics, São Paulo State University (Unesp), Institute of Science and Technology, Av. Eng. Francisco José Longo, no. 777, Jardim São Dimas, 12245-000, São José dos Campos, SP, Brazil. Electronic address: mmbottino@uol.com.br.
Abstract
OBJECTIVES: To investigate the influence of different materials for monolithic full posterior crowns using 3D-Finite Element Analysis (FEA). METHODS: Twelve (12) 3D models of adhesively-restored teeth with different crowns according to the material and its elastic modulus were analysed: Acrylic resin, Polyetheretherketone, Composite resin, Hybrid ceramic, pressable and machinable Zirconia reinforced lithium silicate, Feldspathic, Lithium disilicate, Gold alloy, Cobalt-Chromium alloy (Co-Cr), Zirconia tetragonal partially stabilized with yttria, and Alumina. All materials were assumed to behave elastically throughout the entire deformation. Results in restoration and cementing line were obtained using maximum principal stress. In addition, maximum shear stress criteria was used for the cementing line. RESULTS: Restorative materials with higher elastic modulus present higher stress concentration inside the crown, mainly tensile stress on an intaglio surface. On the other hand, materials with lower elastic modulus allow stress passage for cement, increasing shear stress on this layer. Stiffer materials promote higher stress peak values. SIGNIFICANCE: Materials with higher elastic modulus such as Co-Cr, zirconia and alumina enable higher tensile stress concentration on the crown intaglio surface and higher shear stress on the cement layer, facilitating crown debonding.
OBJECTIVES: To investigate the influence of different materials for monolithic full posterior crowns using 3D-Finite Element Analysis (FEA). METHODS: Twelve (12) 3D models of adhesively-restored teeth with different crowns according to the material and its elastic modulus were analysed: Acrylic resin, Polyetheretherketone, Composite resin, Hybrid ceramic, pressable and machinable Zirconia reinforced lithium silicate, Feldspathic, Lithium disilicate, Gold alloy, Cobalt-Chromium alloy (Co-Cr), Zirconia tetragonal partially stabilized with yttria, and Alumina. All materials were assumed to behave elastically throughout the entire deformation. Results in restoration and cementing line were obtained using maximum principal stress. In addition, maximum shear stress criteria was used for the cementing line. RESULTS: Restorative materials with higher elastic modulus present higher stress concentration inside the crown, mainly tensile stress on an intaglio surface. On the other hand, materials with lower elastic modulus allow stress passage for cement, increasing shear stress on this layer. Stiffer materials promote higher stress peak values. SIGNIFICANCE: Materials with higher elastic modulus such as Co-Cr, zirconia and alumina enable higher tensile stress concentration on the crown intaglio surface and higher shear stress on the cement layer, facilitating crown debonding.
Authors: Gabriela Fernandes da Fonseca; Guilherme Schmitt de Andrade; Amanda Maria de Oliveira Dal Piva; João Paulo Mendes Tribst; Alexandre Luiz Souto Borges Journal: J Indian Prosthodont Soc Date: 2018 Oct-Dec