INTRODUCTION: In order to understand the mechanical behavior of a weakened incisor, this study aimed to evaluate the stress distribution caused by different alveolar bone heights and cement layer thickness. METHODS: A finite element analysis was conducted for this investigation. An intact maxillary central incisor was initially modeled, and the bone of the models was modified in order to simulate 4 levels of bone height: BL0 (no bone loss), BL1 (1/3 bone loss), BL2 (1/2 bone loss), and BL3 (2/3 bone loss). These teeth models were remodeled with a fiber post at 2 different cement thicknesses and restored with a ceramic crown; "A" refers to the well-adapted fiber post (0.3 mm) and "B" to the nonadapted fiber post (1 mm), resulting in 12 models. RelyX ARC (3M ESPE, St Paul, MN) cement was simulated for the cementation of the crowns and fiber posts for all groups. Numeric models received a load of 100 N on the lingual surface. All materials and structures were considered linear elastic, homogeneous, and isotropic. Numeric models were plotted and meshed with isoparametric elements, and results were expressed in maximum principal stress. RESULTS: For fiberglass posts, cement, and dentin, the highest stress concentration occurred in the groups with increased bone loss. For cortical bone, the highest values were for the groups with 1/3 bone loss. A greater thickness of cement layer concentrates more stress. CONCLUSIONS: More bone loss and greater CLT were the influential factors in concentrating the stress.
INTRODUCTION: In order to understand the mechanical behavior of a weakened incisor, this study aimed to evaluate the stress distribution caused by different alveolar bone heights and cement layer thickness. METHODS: A finite element analysis was conducted for this investigation. An intact maxillary central incisor was initially modeled, and the bone of the models was modified in order to simulate 4 levels of bone height: BL0 (no bone loss), BL1 (1/3 bone loss), BL2 (1/2 bone loss), and BL3 (2/3 bone loss). These teeth models were remodeled with a fiber post at 2 different cement thicknesses and restored with a ceramic crown; "A" refers to the well-adapted fiber post (0.3 mm) and "B" to the nonadapted fiber post (1 mm), resulting in 12 models. RelyX ARC (3M ESPE, St Paul, MN) cement was simulated for the cementation of the crowns and fiber posts for all groups. Numeric models received a load of 100 N on the lingual surface. All materials and structures were considered linear elastic, homogeneous, and isotropic. Numeric models were plotted and meshed with isoparametric elements, and results were expressed in maximum principal stress. RESULTS: For fiberglass posts, cement, and dentin, the highest stress concentration occurred in the groups with increased bone loss. For cortical bone, the highest values were for the groups with 1/3 bone loss. A greater thickness of cement layer concentrates more stress. CONCLUSIONS: More bone loss and greater CLT were the influential factors in concentrating the stress.
Authors: Luigi Giovanni Bernardo Sichi; Fernanda Zapater Pierre; Laura Viviana Calvache Arcila; Guilherme Schmitt de Andrade; João Paulo Mendes Tribst; Pietro Ausiello; Alessandro Espedito di Lauro; Alexandre Luiz Souto Borges Journal: Molecules Date: 2021-10-10 Impact factor: 4.411
Authors: Regina Furbino Villefort; João Paulo Mendes Tribst; Amanda Maria de Oliveira Dal Piva; Alexandre Luiz Borges; Nívia Castro Binda; Carlos Eduardo de Almeida Ferreira; Marco Antonio Bottino; Sandra Lúcia Ventorim von Zeidler Journal: PLoS One Date: 2020-10-30 Impact factor: 3.240
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