Avaliação das propriedades nanomecânicas e do comportamento micromecânico da interface dentina/adesivo antes e após a degradação hidrolítica: análises através de nanoindentação e método dos elementos finitos tridimensional

• Autor(a) principal: Anchieta, Rodolfo Bruniera [UNESP]
• Data de Publicação: 2013
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/108879
• topic: Adesivos dentinários; Método dos elementos finitos; Dentina; Finite element method

OBJECTIVE: To evaluate the morphology, nanoleakage, elastic modulus and micromechanical behavior of dentin-adhesive (d-a) interface of specimens subjected to degradation, 24 hours after restorative procedures (T0) and 12 months after storage in Hanks' solution (T1). MATERIAL AND METHODS: Five adhesive systems were used (5 groups): SBMP – Scotchbond Multi-Purpose; CSEB – Clearfil SE Bond; OUB – One-Up Bond F-; AEO – Adper Easy One; P90 – Self-etching adhesive P90. Fifty two human sound third molars were used, 10 teeth for each group (n=10). The other two teeth were used to analysis the dentin morphology. At least 4 fragments of d-a interface (specimens) were obtained in mesio-distal direction from each tooth. Fifteen indentations were done for each structure in each time of analysis. Five models of dentin restored with composite resin (41x41x82 mm) were built using the software SolidWorks 2010, representing the groups analyzed in the laboratory tests in an ideal scenario. Other two models per group were built simulating the two times of analysis (T0 and T1). The dimensions and mechanical properties of the models followed the data obtained in the laboratory tests. The numerical analysis was performed using the finite element (AnsysWorkbench 14.0) to obtain the maximum principal stress. Two-way Anova linear mixed models and post-hoc T-test were used to determine the statistical significance from nanoindentation and nanoleakage tests. The test One-way ANOVA and HolmSidak (p <0.05) were used for analysis of the SEM measurements. RESULTS: The thickest hybrid layer and bigger tags were found for SBMU (p<0.05). There were decrease in elastic modulus for HL and dentin for all groups (p<0.05). There were no decrease in elastic modulus on adhesive layer for SBMU and P90 (p>0.05). There increase of nanoleakage between T0...