Influence of Specimens' Design and Manufacturing Process on Microtensile Bond Strength to Enamel - Laboratory and FEA Comparison

Autor(es)

Sadek, Fernanda Tranchesi ^[1] ; Muench, Antonio ^[1] ; Poiate, Isis Andrea ^[2] ; Poiate Junior, Edgard ^[3] ; Capel Cardoso, Paulo Eduardo ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Dent Mat, BR-09500900 Sao Paulo - Brazil

^[2] Univ Fed Fluminense, Sch Dent, Dept Operat Dent, Rio De Janeiro - Brazil

^[3] Univ Sao Paulo, Dept Min & Petr Engn, BR-09500900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS; v. 13, n. 2, p. 253-260, APR-JUN 2010.
• Citações Web of Science: 1

Resumo

This study evaluated the effect of specimens' design and manufacturing process on microtensile bond strength, internal stress distributions (Finite Element Analysis - FEA) and specimens' integrity by means of Scanning Electron Microscopy (SEM) and Laser Scanning Confocal Microscopy (LCM). Excite was applied to flat enamel surface and a resin composite build-ups were made incrementally with 1-mm increments of Tetric Ceram. Teeth were cut using a diamond disc or a diamond wire, obtaining 0.8 mm(2) stick-shaped specimens, or were shaped with a Micro Specimen Former, obtaining dumbbell-shaped specimens (n = 10). Samples were randomly selected for SEM and LCM analysis. Remaining samples underwent microtensile test, and results were analyzed with ANOVA and Tukey test. FEA dumbbell-shaped model resulted in a more homogeneous stress distribution. Nonetheless, they failed under lower bond strengths (21.83 +/- 5.44 MPa)(c) than stick-shaped specimens (sectioned with wire: 42.93 +/- 4.77 MPaa; sectioned with disc: 36.62 +/- 3.63 MPab), due to geometric irregularities related to manufacturing process, as noted in microscopic analyzes. It could be concluded that stick-shaped, nontrimmed specimens, sectioned with diamond wire, are preferred for enamel specimens as they can be prepared in a less destructive, easier, and more precise way. (AU)

• Processo FAPESP: 05/60644-2 - Influencia da geometria e modo de obtencao dos corpos-de-prova no teste de microtracao.
• Beneficiário: Fernanda Tranchesi Sadek
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado