In vitro shearing force testing of two seventh generation self-etching primers

• Localización: Journal of orthodontics, ISSN-e 0301-228X, ISSN 1465-3125, Nº. 4-38, 2011, págs. 269-274
• Idioma: inglés
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• Resumen

  • Objective: The purpose of this study was to evaluate the in vitro shearing force performance of orthodontic attachments using two self-etching primers (SEPs): iBOND and G-Bond.

    Design: In vitro, laboratory study.

    Material and methods: One hundred and eighty human molars were randomly divided into four groups and again into three sub-groups with 15 teeth each. Teeth were bonded with a stainless steel button (GAC International, Bohemia, NY, USA) using Transbond XT adhesive composite. The bonding agents were iBOND, G-Bond, Transbond Plus SEP and Transbond XT primer. Shearing force tests were carried out immediately, and at 24 hours and 3 months using a universal testing machine. Force to debond (N) and Adhesive Remnant Index (ARI) scores were evaluated and compared.

    Results: Transbond XT primer required a higher immediate (P<0·05) force to debond when compared to the Transbond Plus SEP, iBOND and G-Bond. After 24 hours, mean force to debond for Transbond XT primer and Transbond Plus SEP showed significant increases. At 3 months, all four bonding agents demonstrated force levels to debond that were not significantly different from one another. Furthermore, comparison of ARI scores indicated a significant difference between the groups at all time points.

    Conclusions: iBOND and G-Bond may well sufficiently withstand the alignment and occlusal forces imparted by light archwires during immediate archwire tie-in and over the initial levelling and alignment phase.