Effect of Different Surface Treatments and Roughness on the Repair Bond Strength of Aged Nanohybrid Composite

The influence of different surface treatment protocols and bonding agents on the repair microtensile bond strength of six-month’ aged composite: An in vitro study

“…However, other studies claimed that using flowable composite as intermediate agents in composite repair had been attributed to their stress absorbing ability and to their hydrolytic stability compared to different boding agents. They proved that flowable composite, when used as an intermediate for composite repair, was capable of producing high repair bond strength [2,9,10].…”

“…These surface treatments provide surface irregularities which promote micro-mechanical interlocking between the substrate surface and the repair resin. [5,[7][8][9][10] In most clinical studies, partial removal of the old composite was done using coarse diamond bur [1,[11][12][13], however, using either medium or fine grit diamond bur can produce more reliable repair bond strength than using coarse diamond bur. [13,14] on the other hand, Erbium laser has been recently suggested for surface roughness of the old composite by ablation mechanism, which can be used in the process of repair [15][16][17].…”

“…After surface treatment, the next step is the application of bonding gents in order to enhance chemical bond as experimentally proved in many literatures. [1,2,8,10,18,19] In earlier studies, promising results of composite repair were obtained using different protocols; however these results were questionable as most tests were performed on non-aged substrates which didn't represent the real clinical situation. In addition, they often depend on using the same type of composite for the substrate and the repair material [5,6,11].…”

“…Then each block in all surface treated groups received both Bond and Flow intermediate agents side by side in the same block for standardization. Both intermediate agents were applied in thin layer using a small brush, air thinned and photopolymerized according to the manufacturer's instructions of each intermediate agent [10,18,21].…”

Avaliação do efeito de diferentes tratamentos de superfície e tipo de material adesivo na resistência de união de reparo de resina bulk fill envelhecida

“…21 Um método alternativo consiste na abrasão à ar com pó de óxido de alumínio ou o jateamento de partículas de Al2O3 modificadas por sílica, que podem ser empregados para a criação de microrretenções. 8,9,13,14,16,18,21,24,59,60 Na técnica do jateamento de partículas de Al2O3 modificadas por sílica, apesar da proposta do melhoramento químico através da incorporação da sílica nas partículas de Al2O3, alguns pesquisadores afirmam que a sua utilização não promove uma maior resistência de união quando comparado as partículas de Al2O3 convencionais 13,15,61 e acreditam que a influência do tamanho da partícula é mais relevante do que a sua composição química. Partículas maiores tendem a produzir uma rugosidade superficial mais profunda, melhorando a ligação entre os materiais do reparo.…”