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

Abstract

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.

Keywords:

• Force to debond
• iBOND
• G-Bond