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Texto completo SciELO Brasil
Borges, Alexandre Luiz Souto
Texto completo
Id: lil-764162
Autor: CORREA NETTO, Luciano Ribeiro; BORGES, Alexandre Luiz Souto; GUIMARÃES, Heloisa Bailly; ALMEIDA, Elis Regina Nunes de; POSKUS, Laiza Tatiana; SILVA, Eduardo Moreira da.
Título: Marginal integrity of restorations produced with a model composite based on polyhedral oligomeric silsesquioxane (POSS)
Fonte: J. appl. oral sci;23(5):450-458, Sept.-Oct. 2015. tab, graf.
Idioma: en.
Projeto: CNPq.
Resumo: Marginal integrity is one of the most crucial aspects involved in the clinical longevity of resin composite restorations.Objective To analyze the marginal integrity of restorations produced with a model composite based on polyhedral oligomeric silsesquioxane (POSS).Material and Methods A base composite (B) was produced with an organic matrix with UDMA/TEGDMA and 70 wt.% of barium borosilicate glass particles. To produce the model composite, 25 wt.% of UDMA were replaced by POSS (P25). The composites P90 and TPH3 (TP3) were used as positive and negative controls, respectively. Marginal integrity (%MI) was analyzed in bonded class I cavities. The volumetric polymerization shrinkage (%VS) and the polymerization shrinkage stress (Pss - MPa) were also evaluated.Results The values for %MI were as follows: P90 (100%) = TP3 (98.3%) = B (96.9%) > P25 (93.2%), (p<0.05). The %VS ranged from 1.4% (P90) to 4.9% (P25), while Pss ranged from 2.3 MPa (P90) to 3.9 MPa (B). For both properties, the composite P25 presented the worst results (4.9% and 3.6 MPa). Linear regression analysis showed a strong positive correlation between %VS and Pss (r=0.97), whereas the correlation between Pss and %MI was found to be moderate (r=0.76).Conclusions The addition of 25 wt.% of POSS in methacrylate organic matrix did not improve the marginal integrity of class I restorations. Filtek P90 showed lower polymerization shrinkage and shrinkage stress when compared to the experimental and commercial methacrylate composite.
Descritores: Compômeros/química
Adaptação Marginal Dentária
Restauração Dentária Permanente/métodos
Metacrilatos/química
Compostos de Organossilício/química
Polimerização
-Análise de Variância
Compômeros/uso terapêutico
Resinas Compostas/química
Resinas Compostas/uso terapêutico
Análise do Estresse Dentário
Modelos Lineares
Teste de Materiais
Microscopia Eletrônica de Varredura
Metacrilatos/uso terapêutico
Compostos de Organossilício/uso terapêutico
Reprodutibilidade dos Testes
Cimentos de Resina/química
Cimentos de Resina/uso terapêutico
Propriedades de Superfície
Fatores de Tempo
Limites: Seres Humanos
Tipo de Publ: Estudo Comparativo
Research Support, Non-U.S. Gov't
Responsável: BR1.1 - BIREME



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