Perfil de distribuição da tensão na interface dos materiais restauradores e cimentos odontológicos através do Método do Elemento Finito

• Ano de defesa: 2013
• Autor(a) principal: Giovani Lana Peixoto de Miranda
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Cimentos dentários; Modulo de elasticidade; Cerâmicas; Método do elemento finito; Resistência à tração; Análise de elemento finito; Materiais dentarios; Materiais biocompatíveis/uso terapêutico; Cerâmica odontológica
• Link de acesso: http://hdl.handle.net/1843/BUBD-9HXF7L

The literature regarding the profiles of stress distribution in dental cements as a function of the elastic modulus of dental restorative materials using finite element analysis (FEA) is limited. OBJECTIVE: To evaluate the distribution of the stress generated by dental restorative materials with different elastic modulus (E) to different cementing materials using FEA. METHODS: A 10x10mm three-layer model was generated with the thickness of each layer determined as: a) the first layer being the dentin-like substrate = 4mm; b) the second being the dental cement = 100m; and the third being the restorative material = 1.5 mm. FEA modeling generated a mesh with a 200N load applied at the center of the modeled restorative material layer. The cements selected were zinc phosphate (SSWhite), RelyX U200 clicker and automix (3M ESPE), Ketac-Cem (3M ESPE). The restorative materials were Lava Ultimate (3M ESPE), e.maxPRESS and e.maxCAD (Ivoclar ). Gold was used a control. (E) and Poisson's ratio values for all groups were extracted from the literature. 40 groups were created by all possible combinations of the cement / restorative material interfaces. The voltage spikes values along the interface were obtained. These values were modeled via a normal distribution to generate a distribution curve. Each cement was fixed to observe the behavior of the restorative materials and vice versa. RESULTS: Lava Ultimate showed more tension absorbance amongst all restorative materials analyzed and lower absorption voltage values. Gold, e.maxPRESS and e.maxCAD showed similar profile tension distribution. Zinc phosphate absorbed less tension while the other cements had a similar profile stress distribution. CONCLUSION: The stress profile distribution of FEA suggested that the modulus of elasticity of the restorative materials appears to influence the stress distribution profile on different dental cements.