Evaluation of the shear bond strength of the union between two CoCr-alloys and a dental ceramic

Abstract

EVALUATION OF THE SHEAR BOND STRENGTH OF THE UNION BETWEEN TWO CoCr-ALLOYS AND A DENTAL CERAMICNTRODUCTION: Based on the importance of the integrity of the metal/ceramic interface, the purpose of this work was to evaluate the shear bond strength of the metal-ceramic union of two Co-Cr alloys (Wirobond C, Bego; Remanium 2000, Dentaurum) combined with Omega 900 ceramic (Vita Zahnfabrik). MATERIAL and METHOD: Eleven cylindrical matrixes were made for each alloy, and the metallic portion was obtained with the lost wax casting technique with standardized waxing of 4mm of height and of 4mm of diameter. The ceramic was applied according to the manufacturer's recommendations with the aid of a teflon matrix that allowed its dimension to be standardized in the same size as the metallic portion. The specimens were submitted to the shear bond test in an universal testing machine (EMIC), with the aid of a device developed for such intention, and constant speed of 0.5mm/min. RESULTS and CONCLUSIONS: The mean resistance was 48.387MPa for Wirobond C alloy, with standard deviation of 17.718, and 55.956MPa for Remanium 2000, with standard deviation of 17.198. No statistically significant difference was observed between the shear strength of the two metal-ceramic alloys. Uniterms: Ceramics; Shear test; Alloys NTRODUÇÃO: Baseados na importância da integridade da interface metal-cerâmica, este trabalho tem como objetivo avaliar a resistência ao cisalhamento da união metal-cerâmica de duas ligas de Co-Cr (Wirobond C, Bego; Remanium 2000, Dentaurum) combinadas com a cerâmica Omega 900 (Vita Zahnfabrik). MATERIAIS E MÉTODOS: Foram confeccionados 11 corpos-de-prova cilíndricos para cada liga utilizada, sendo que a porção metálica foi obtida por fundição pela técnica da cera perdida, através de enceramentos padronizados com 4mm de altura por 4mm de diâmetro. A aplicação da cerâmica foi realizada segundo recomendações do fabricante, com auxílio de uma matriz de teflon que permitia sua padronização com as mesmas dimensões da porção metálica. Os corpos-de-prova foram submetidos ao ensaio de resistência ao cisalhamento em máquina de ensaios universal (EMIC), com auxílio de dispositivo desenvolvido para tal propósito, sob velocidade constante de 0,5mm/ min. RESULTADOS E CONCLUSÕES: As médias de resistência obtidas foram 48,387 MPa para a liga Wirobond C, com desvio padrão de 17,718, e 55,956 MPa para a Remanium 2000, com desvio padrão de 17,198. Após análise de variância foi possível observar que não há diferença estatisticamente significante entre os valores de resistência ao cisalhamento das duas ligas metalocerâmicas.

Shear bond strength between porcelain and nano filler composite resin with or without 9% hydrofluoric acid etching

“…This fact showed that the kind of surface treatment on porcelain determine the value of composite resin shear bond strength that will be got. The highest shear bond strength was gotten in treatment group I, which was suitable with the result of the experiment from another reseacher, 13 who did the experiment on micro shear bond strength, it might be because group I had two kinds of bonds between porcelain and composite resin were micromechanical bond and chemical bond, while in group II the bond was just chemically.…”

“…It was appropriate with the research which stated that parallel directing of the strength to the unification field between two materials tested may minimize cohesive failure and the test result tends to result in adhesive failure. 13 From the result of this experiment we get statistically significant differences on 95% trust in group I and II. This fact showed that the kind of surface treatment on porcelain determine the value of composite resin shear bond strength that will be got.…”

“…Each way of assessments has its own advantages and disadvantages and some writers state that shear test is the most adequate one to measure shear bond strength between two materials. [4][5][6]8,9,13 This kind of test is done through the potentials which directly develop on the surfaces of two materials which were going to be tested. The test on the shear bond strength with flat surface may direct most of the potential pressure to the fusing surface, without any influences of elasticity modules of the tested material as what happens in flexural test.…”

Effect of different air-abrasion particles on metal-ceramic bond strength

“…They concluded that the bond strengths of the three ceramic systems to the Ni-Cr and Co-Cr-Ti alloys significantly varied, indicating that metal/ceramic compatibility was very important for bond strength. 15 Pretti et al 24 evaluated the shear bond strength of a metal-ceramic bond of two Co-Cr alloys. They reported shear bond strengths of 48.39 MPa and 55.96 MPa for the two alloys and stated that no significant difference was observed.…”

“…The metal surfaces were air-abraded with 100-mm Al 2 O 3 for 10 seconds at a distance of 2 cm in their study. 24 Çiftçi et al 25 evaluated the shear bond strengths of four esthetic veneering materials on a Ni-Cr alloy. They reported a shear bond strength of 34.96 MPa for the ceramic veneer.…”