Evaluation of shear bond strength of fixed orthodontic retainers using flow resin, with or without adhesive: an in vitro study

Giovani Ceron Hartmann, Geyssi Karolyne Gonzatto, Jussimar Scheffer Castilhos, Priscilla do Monte Ribeiro Busato, Mauro Carlos Agner Busato

Objective: To evaluate the shear bond strength (SBS) of fluid composite resin (Flow) for bonding fixed retainers, as well as if the suppression of the adhesive could harm the laboratory performance of these retainers. Methods: Retainers directly bonded to 80 bovine teeth extracted for manufacturing of test specimens, and randomly divided into four groups, were tested (n=20), with different adhesion systems: Group 1 – Transbond XT (using adhesive); Group 2 – Flow Opallis (using adhesive- Amber); Group 3 – Flow Opallis (without adhesive); Group 4 – Transbond XT (without adhesive). The specimens were subjected to tensile (pull-out) tests performed on a TA.HDplus texturometer (Stable Micro Systems), with a 0.5 mm/min speed, and breaking loads were recorded in Newtons. Adhesive Remnant Index (ARI) was also evaluated. Results: There was no statistically significant difference in SBS between groups using adhesive or between those who did not use adhesive (p<0.05). The Transbond XT without adhesive group reached similar resistance to Transbond XT with adhesive group. Regarding ARI, the groups which used adhesive (1 and 2) were statistically different from groups in which adhesive was not used (3 and 4). Conclusions: Based on these results, it was observed that the SBS and ARI obtained with the Flow resin are similar to those with another orthodontic resins with load.

Keywords: Shear bond strength. Tensile strength. Acrylic resins.

How to cite: Hartmann GC, Gonzatto GK, Castilhos JS, Busato PMR, Busato MCA. Avaliação da resistência adesiva de contenções ortodônticas fixas utilizando resina flow, com ou sem adesivo: um estudo in vitro. Rev Clín Ortod Dental Press. 2017 Out-Nov;16(5):57-67. DOI: https://doi.org/10.14436/1676-6849.16.5.057-067.art

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