Influence of filler addition, storage medium and evaluation time on biaxial flexure strength and modulus of adhesive systems

Autor(es)

Giannini, Marcelo ^[1] ; Liberti, Michele Santana ^[1] ; Galvao Arrais, Cesar Augusto ^[2] ; Reis, Andre Figueiredo ^[2] ; Mettenburg, Donald ^[3] ; Rueggeberg, Frederick Allen ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Dept Restorat Dent, Piracicaba Dent Sch, Operat Dent Div, BR-13414903 Piracicaba, SP - Brazil

^[2] Univ Guarulhos, Dept Operat Dent, Sch Dent, Guarulhos, SP - Brazil

^[3] Georgia Hlth Sci Univ, Dept Oral Rehabil, Dent Mat Sect, Sch Dent, Augusta, GA - USA

• Tipo de documento: Artigo Científico
• Fonte: ACTA ODONTOLOGICA SCANDINAVICA; v. 70, n. 6, p. 478-484, DEC 2012.
• Citações Web of Science: 8

Resumo

Objective. This study evaluated the effects of filler addition, storage medium and time on biaxial flexural strength and flexural modulus of six adhesive systems. Materials and methods. The adhesives were either unfilled resins: Single Bond, Prime\&Bond 2.1 and One-Step; or filled resins: Single Bond Plus, Prime\&Bond NT and One-Step Plus. Resin discs of each product (0.5 mm thick x 6.0 mm diameter) were prepared using silicon molds (n = 10). The discs were stored dry, in water, mineral oil or ethanol for 1 week or 3 months before biaxial flexural testing. Data were statistically analyzed by 3-way ANOVA and Tukey's post-hoc test (alpha = 0.05). The specimens were tested in a universal testing machine at 1.27 mm/min until failure occurred. Results. In general, the storage in ethanol led to significantly lower flexural strength and flexural modulus values than the other storage conditions for all adhesives in both storage periods. Filler addition increased flexural strength and flexural modulus for Prime\&Bond NT, when it was stored dry or in water for 1 week. For Single Bond Plus, the filler addition resulted in higher flexural modulus, when it was stored for 1 week in oil and in ethanol. No significant differences in flexural modulus were observed between One-Step and One-Step Plus in any storage medium. Conclusions. Results suggested that filler addition does not necessarily have to increase the flexural strength and flexural modulus. Ethanol and oil storages tended to yield opposite effects. (AU)

• Processo FAPESP: 06/57998-0 - Avaliação de sistemas adesivos com ou sem carga através do ensaio de resistência flexural biaxial
• Beneficiário: Michele Santana Liberti
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica