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Revista Portuguesa de Estomatologia,
Medicina Dentária e Cirurgia Maxilofacial

rev port estomatol med dent cir maxilofac. 2017;58(2):71-78

Original research

Effect of thermal cycling on the shear bond strength
of different orthodontic adhesives to enamel

b
a
a
Vando L. Ribeiro-Neto , Monica Pinho , Bruno Henriques ,
b
a
Filipe S. Silva , Sandra Gavinha , Julio C. M. Souza b,c, *
a School of Dentistry, School of Health Sciences (FCS), Universidade Fernando Pessoa (UFP), Porto, Portugal
b Center Microelectromehanical Systems (CMEMS), University of Minho, Guimarães, Portugal
c School of Dentistry (DODT), Post-Graduate Program in Dentistry (PPGO), Federal University of Santa Catarina, Florianópolis/SC, Brazil

a r t i c l e i n f o a b s t r a c t

Article history: Objective: The aim of this study was to assess the influence of thermal cycling on the shear
Received 29 September 2016 bond strength of three types of adhesives used for orthodontic brackets to human enamel.
Accepted 14 January 2017 Methods: Sixty six human premolars were used in this study. Two groups of dental resin com-
Available online 16 May 2017 posite adhesives (ED; G) and one compomer (TP) were thermal cycled from 5 up to 55 °C at
4000 cycles for 45 s in an artificial saliva solution. Then, samples were assessed by shear bond
Keywords: tests and inspected by optical and scanning electron microscopy. The resulting enamel sur-
Adhesive faces were then evaluated according to the adhesive remnant index (ARI).
Compomers Results: One resin composite adhesive (group G) showed the highest shear bond strength
Fatigue values. Thermal cycling negatively affected the bond strength of the compomer-based ad-
Orthodontics hesive although results showed clinically acceptable adhesion values after thermal fatigue
Shear strength for such cycles. ARI showed significant amount of residual material on the tooth surface
with the adhesives that indicated strong bonding to enamel. Different adhesion mechanisms
were noticed at both adhesive-enamel or adhesive-bracket interfaces.
Conclusion: The orthodontic adhesives revealed proper bond strength to enamel for clinical
applications considering thermal conditions assessed in this study although the compo-
mer-based adhesive was negatively affected by thermal cycling. The high remnant adhesive
amount on enamel indicated high bond strength leading to enamel damage during debonding.
(Rev Port Estomatol Med Dent Cir Maxilofac. 2017;58(2):71-78)
© 2017 Sociedade Portuguesa de Estomatologia e Medicina Dentária.
Published by SPEMD. This is an open access article under the CC BY-NC-ND license
(http://creativecommons.org/licenses/by-nc-nd/4.0/).

* Corresponding author.
E-mail address: jsouza@dem.uminho.pt (Júlio C. M. Souza).
http://doi.org/10.24873/j.rpemd.2017.05.008
1646-2890/© 2017 Sociedade Portuguesa de Estomatologia e Medicina Dentária. Published by SPEMD.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).