Effect of Variation of Root Post in Different Layers of Tooth: Linear vs Nonlinear Finite Element Stress Analysis

Biomechanical Models of Endodontic Restorations

“…Wakabayashi et al (Wakabayashi et al, 2008) cited three main causes of non-linearity: (1) material non-linearities, like the response of the PDL, (2) the changing interrelation of objects, as when loads introduce contacts between components, and (3) geometric nonlinearities, as a consequence of large deformations in some components. In recent years, some works have introduced non-linear FE models as a better way to represent the response of endodontic restorations (Sorrentino et al, 2009;Uddanwadiker et al, 2007). On the other hand, masticatory loads are variable, implying that the restoration is subject to fatigue, but very few fatigue simulations are found in the literature up until now (Huysmans & Van der Varst, 1993).…”

“…Some earlier laboratory studies maintain that preparing a ferrule might improve the resistance of post-core system (Assif & Gorfil, 1994;Aykent et al, 2006;Ichim et al, 2006;Tan et al, 2005;Zhi-Yue & Yu-Xing, 2003). Accordingly, many works in the literature prepared a ferrule of varying heights in the biomechanical model: 2 mm (Mezzomo et al, 2011;Uddanwadiker et al, 2007), 2.5 mm (Coelho et al, 2009) , 1 mm (Toksavul et al, 2006). Ichim et al (Ichim et al, 2006) prepared biomechanical models without a ferrule and with a ferrule of different heights (0.5, 1.0, 1.5, 2 mm) to study its effect on the strength of the restoration.…”

“…This value is used in several works (Davy et al, 1981;Dejak et al, 2005;Garbin et al, 2010) and a similar value of 68.9 MPa in others Gonzalez-Lluch et al, 2009b;Holmes et al, 1996;Pegoretti et al, 2002). Some recent works consider the non-linear mechanical response of the ligament using a non-linear stress-strain relationship for the finite elements representing the PDL Suzuki et al, 2008;Uddanwadiker et al, 2007). Maceri et al (Maceri et al, 2009) used a set of different spring elements connecting dentine to the bone to represent the non-linear response of the ligament.…”

Three-dimensional finite element stress analysis: The technique and methodology of non-linear property simulation and soft tissue loading behavior for different partial denture designs

“…The partial dentures studied evaluate specific horizontal bracing connector designs with magnetic attachment retained mandibular partial dentures. The present paper reports fabrication procedures and analysis methods for the FEM material property design for residual ridge mucosa and periodontal ligament [17][18][19][20] .…”

Análise tridimensional pelo método de elementos finitos do comportamentto biomecânico do incisivo central superior hígido e restaurado com coroa cerâmica utilizando diferentes retentores intra-radiculares

“…Diante dos resultados, os autores concluíram que: as maiores tensões de compressão e tração ocorreram na face lingual da dentina; pequenas alterações nas dimensões dos pinos têm efeito mínimo na distribuição de tensão de compressão e tração na dentina; a maior concentração de Tortamano (1997), com o objetivo de estudar as tensões desenvolvidas no ligamento periodontal e osso de um incisivo central superior durante a aplicação de força ortodôntica, realizou um estudo através do MEF. O modelo foi construído a partir de uma peça anatômica de um incisivo central superior, foi aplicada uma carga de 1 N no sentido vestíbulo-lingual.…”