Avaliação da resistencia ao cisalhamento da resina composta e do cimento de ionomero de vidro na fixação de braquetes metalicos




The aim of this study was to evaluate the shear bond strength of composites and glass ionomer cement of different metallic brackets bonding (Morelli, Abzil-Lancer, Dentaurum e GAC). One hundred and twenty human premolars were used. For eighty premolars, the vestibular faces were etched and were bonded to enamel surface using Concise Ortho and Transbond XT, whereas in others forty premolars the brackets were bonded with Fuji Ortho LC in the vestibular faces without acid etching. All samples were stored in fisiologic solution 0,9% at 37°C for 24 hours. Afier the sample were submitted to shear bond strength in an Instron at a crosshead speed of 0.5 mm/min. The results were submitted to ANOVA and Tukey s test (p<0.05). Associating adhesives systems to respective brackets, the data indicated that: a) with Concise Ortho, the strengths (kgt/mm?POT. 2?) of GAC bracket (1.698) was significant1y higher than Abzil-Lancer (1.353), Dentaurum (1.293) and Morelli (0.828) brackets; b) with Transbond XT, Dentaurum (1.082) and GAC (1.225) brackets showed average higher than Morelli (0.583) and Abzil-Lancer (0.621); and, c) with Fuji Ortho LC, it wasn t showed difference between the average of different brackets tested (Morelli=0.301, Abzil-Lancer=0.309, Dentaurum 0.230 and GAC=0.338). The authors concluded that the Concise Ortho showed highest shear bond strength values followed by Transbond XT and Fuji Ortho LC. The GAC bracket showed higher strength in alI adhesives systems and the Morelli bracket the lowest strength


tensile bond strengths shear bond strengths resistencia de materiais glass ionomer cement materiais dentarios brackets ortodontia

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