| Autor: |
Rocha RF; Prosthodontics Unit, Institute of Science and Technology, UNESP - Universidade Estadual Paulista, São José dos Campos. SP, Brazil., Anami LC; Prosthodontics Unit, Institute of Science and Technology, UNESP - Universidade Estadual Paulista, São José dos Campos. SP, Brazil., Campos TM; Department of Physics, ITA - Instituto Tecnológico da Aeronáutica, São José dos Campos, SP, Brazil., Melo RM; Prosthodontics Unit, Institute of Science and Technology, UNESP - Universidade Estadual Paulista, São José dos Campos. SP, Brazil., Souza RO; Department of Dentistry, Division of Prosthodontics, UFRN - Universidade Federal do Rio Grande do Norte, Natal, RN, Brazil., Bottino MA; Prosthodontics Unit, Institute of Science and Technology, UNESP - Universidade Estadual Paulista, São José dos Campos. SP, Brazil. |
| Abstrakt: |
Polyetheretherketone (PEEK) is a material suitable for frameworks of fixed dental prostheses. The effect of different surface treatments on the bond strength of PEEK bonded to human dentin was evaluated. One hundred PEEK cylinders (3 mm×3 mm) were divided into five groups according to surface treatment: silica coating, sandblasting with 45 μm Al2O3 particles, etching with 98% sulfuric acid for 5, 30 and for 60 s. These cylinders were luted with resin cement onto 50 human molars. First, each tooth was embedded in epoxy resin and the buccal dentin surface was exposed. Then, two delimited dentin areas (Æ:3 mm) per tooth were etched with 35% phosphoric acid and bonded with a two-step self-priming adhesive system. After the luting procedure the specimens were stored in water (24 h/37 °C). Shear bond strength (SBS) was tested using a universal testing machine (crosshead speed 0.5 mm/min; load cell 50 kgf) and failure types were assessed. Stress data (MPa) were analyzed using the Kruskal-Wallis test. Comparison of the proportions of different failure types was performed using the Bonferroni method (p<0.05). Kruskal-Wallis demonstrated that differences among groups were not significant (p=0.187). Mean SBS were as follows: silica coating, 2.12±1.12 MPa; sandblasting, 2.37±0.86 MPa; sulfuric acid 5 s, 2.28±1.75 MPa; sulfuric acid 30 s, 1.80±0.85 MPa; sulfuric acid 60 s, 1.67±0.94 MPa. Adhesive and mixed failures were predominant in all groups. Both physical and chemical surface treatments produced adhesion between PEEK, resin cement and dentin. |
