Do metal alloy primers increase the bond strength of orthodontic tubes?

Keywords: Shear strength, Dental bonding, Materials testing, Alloys, Orthodontics.

Abstract

Aim: To evaluate the bond strength (BS) and failure mode of orthodontic tubes treated with different alloy primers at the interface among enamel, resin and orthodontic tubes. Methods: Orthodontic tubes were bonded to the enamel of 80 bovine incisors with the orthodontic resin (Transbond XT, 3M Unitek). Prior to bonding, the tubes were chemically treated with (n=20) Metal/Zirconia Primer (MZ, Ivoclar), Scothbond Universal (SB, 3M Espe); Orthoprimer (OP, Morelli) or left untreated (Control - C). Specimens were submitted to 5,000 thermal cycles (5 and 55o C) to age the bonded interface. A shear BS test and failure modes were conducted, and the results were analyzed using one-way analysis of variance and Fisher’s exact test, respectively. Results: No differences were observed among groups regardless of the type of alloy primer used (p = 0.254). However, no differences were observed among the failure modes of the groups tested (p=0.694). The adhesive failure mode between the resin and enamel was the most prevalent failure (45%) for groups OP and C, whereas cohesive failure in the orthodontic resin was the most prevalent failure (40%) for groups SB and MZ. Conclusion: Alloy primers were unable to increase the BS of the orthodontic tubes to enamel.

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Author Biographies

Keity Cristina Moreira de Oliveira, Institute and Research Center São Leopoldo Mandic

Institute and Research Center São Leopoldo Mandic, Campinas, Brazil.

Daylana Pacheco da Silva, University of Campinas

Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas - UNICAMP

Cecília Pedroso Turssi, Institute and Research Center São Leopoldo Mandic

Institute and Research Center São Leopoldo Mandic, Campinas, Brazil.

Flávia Lucisano Botelho do Amaral, Institute and Research Center São Leopoldo Mandic

Institute and Research Center São Leopoldo Mandic, Campinas, Brazil.

Vanessa Cavalli, University of Campinas

Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas - UNICAMP.

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Published
2019-11-11
How to Cite
Oliveira, K. C. M. de, Silva, D. P. da, Turssi, C. P., Amaral, F. L. B. do, & Cavalli, V. (2019). Do metal alloy primers increase the bond strength of orthodontic tubes?. Brazilian Journal of Oral Sciences, 18, e191406. https://doi.org/10.20396/bjos.v18i0.8657247