A method for calculating the compliance of bonded-interfaces under shrinkage: Validation for Class I cavities

Autor(es)

Rodrigues, Flavia P. ^{[1, 2]} ; Lima, Raul G. ^[3] ; Muench, Antonio ^[4] ; Watts, David C. ^{[5, 6]} ; Ballester, Rafael Y. ^[4]

Afiliação do(s) autor(es)

^[1] UNESP Univ Estadual Paulista, Inst Sci & Technol, Sch Dent, Dept Dent Mat & Prosthodont, Sao Jose Dos Campos, SP - Brazil

^[2] Univ Birmingham, Sch Dent, Biomat Unit, Birmingham, W Midlands - England

^[3] Univ Sao Paulo, Sch Engn, Dept Mech Engn, Sao Paulo - Brazil

^[4] Univ Sao Paulo, Sch Dent, Dept Biomat & Oral Biol, Sao Paulo - Brazil

^[5] Univ Manchester, Sch Dent, Manchester, Lancs - England

^[6] Univ Manchester, Photon Sci Inst, Manchester, Lancs - England

• Tipo de documento: Artigo Científico
• Fonte: Dental Materials; v. 30, n. 8, p. 936-944, AUG 2014.
• Citações Web of Science: 10

Resumo

Objective. The compliance for tooth cavity preparations is not yet fully described in the literature. Thus, the objectives were to present a finite element (FE) method for calculating compliance and to apply this to peak shrinkage stress regions in model cavities restored with resin-composite. Methods. Three groups of FE-models were created, with all materials considered linear, homogeneous, elastic and isotropic: (a) a pair of butt-joint bonded cubic prisms (dentin/resin-composite), with dentin of known compliance (0.0666 mu m/N). Free ends were fixed in the Z-axis direction. A 1% volumetric shrinkage was simulated for the resin-composite. Mean displacements in the Z direction at each node at the dentin-resin interface were calculated and divided by the sum of normal contact forces in Z for each node. (b) A series of more complex restored cavity configurations for which their compliances were calculated. (c) A set of 3D-FE beam models, of 4 mm x 2 mm cross-section with lengths from 2 to 10 mm, were also analyzed under both tensile and bending modes. Results. The compliance calculated by FEM for the butt-joint prisms was 0.0652 mu m/N and corresponded well to the analytical value (0.0666 mu m/N). For more accurate representations of the phenomenon, such as the compliance of a cavity or any other complex structure, the use of the displacement-magnitude was recommended, as loading by isotropic contraction also produces transversal deformations. For the beam models, the compliance was strongly dependent upon the loading direction and was greater under bending than in tension. Signcance. The method was validated for the compliance calculation of complex structures subjected to shrinkage stress such as Class I `cavities'. The same FEM parameters could be applied to calculate the real compliance of any interface of complex structures. The compliance concept is improved by considering specific load directions. (C) 2014 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 06/00186-3 - Fatores que interferem na solicitação mecânica de interfaces de restaurações adesivas e soluções para sua minimização
• Beneficiário: Flávia Pires Rodrigues
• Modalidade de apoio: Bolsas no Brasil - Doutorado