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ORIGINAL ARTICLE

Evaluation of bond strength of molar orthodontic tubes subjected to reinforcement with flowable and bonding resins Alexandre Fausto Veiga Jardim1,2 Carlos Estrela1

· Monarko Nunes Azevedo1 · João Batista Souza1 · Jairo Curado Freitas1 ·

Received: 7 October 2019 / Accepted: 30 March 2020 © Springer Medizin Verlag GmbH, ein Teil von Springer Nature 2020

Abstract Objective The goal was to evaluate the adhesive shear bond strength (SBS) of orthodontic tubes bonded to molar teeth and reinforced with Transbond XT (3M Science, St. Paul, MN, USA) and flowable resin. Materials and methods In all, 120 molar teeth, previously extracted from patients with a mean age of 30 were included. Orthodontic molar tubes were bonded on the vestibular surface of these teeth with one of two types of adhesive (Transbond XT [3M Science, St. Paul, MN, USA] or Orthobond [Morelli, Sorocaba, Brazil]). Each of these groups was subsequently divided into four further groups: control and those subjected to the use of resin reinforcement on the occlusal surface of the bonded tubes with one of three materials (Transbond XT, Tetric N Flow [Ivoclar Vivadent, Ellwangen, Germany], Z 350 Flow [3M Science, St. Paul, MN, USA]). SBS and adhesive remnant index tests were performed to evaluate bond strength and type of fracture of the tubes bonded with the different methods. Results The use of resin reinforcement with Transbond XT significantly increased the SBS of tubes bonded with both materials. Flowable composites did not increase the SBS when used as a reinforcement. Less than 50% of the adhesive remained on the vestibular surface after the SBS test in most samples of all groups. Conclusion Transbond XT orthodontic adhesive and Orthobond adhesive had appropriate bonding strengths for clinical use. Furthermore, the use of a resinous reinforcement with Transbond XT significantly increased the SBS of tubes bonded. However this technique with flowable adhesives (Tetric N Flow and Z350 Flow) did not significantly increase SBS when orthodontic tubes were bonded with Transbond XT or Orthobond.

Keywords Orthodontic brackets · Shear bond strength · Adhesive remnant index · Orthodontic adhesives · Masticuatory force

Evaluierung der Haftfestigkeit von mit flüssigen, klebenden Kunststoffen verstärkten kieferorthopädischen Molarenröhrchen Zusammenfassung Zielsetzung Ziel war es, die adhäsive Scherhaftfestigkeit (SBS) von mit Transbond XT (3M Science, St. Paul/MN, USA) und Fließkunststoff auf Molaren geklebten und verstärkten kieferorthopädischen Röhrchen zu evaluieren.

 Alexandre Fausto Veiga Jardim

[email protected] 1

Department of Stomatological Sciences, School of Dentistry, Universidade Federal de Goiás, Goiânia, Brazil

2

Alameda Coronel Eugênio Jardim, 129. Setor Marista, 74175-100 Goiânia, GO, Brazil

K

A. F. Veiga Jardim et al.

Materialien und Methoden Insgesamt wurden 120 Molaren eingeschlossen, die zuvor von Patienten mit einem mittleren Alter von 30 Jahren extrahiert worden waren. Kieferorthopädische Molarenröhrchen wur