Page 8 - SPEMD_60-3

Revista Portuguesa de Estomatologia,
Medicina Dentária e Cirurgia Maxilofacial

rev port estomatol med dent cir maxilofac. 2019;60(3):96-103

Original research

Bonding performance of a universal adhesive:
effect of hydrophobic resin coating and long-term

water storage

a,
a
b
a
Alexandra Vinagre *, Ana Ralho , Nuno Ramos , Ana Messias , João Carlos Ramos a
a Instituto de Dentisteria Operatória, Área de Medicina Dentária, Faculdade de Medicina, Universidade de Coimbra
b Laboratório de Bioestatística e Informática Médica, Faculdade de Medicina, Universidade de Coimbra

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

Article history: Objectives: To evaluate the immediate and water-aged microtensile bond strength of a uni-
Received 3 August 2019 versal adhesive to dentin, using the self-etch approach with and without an additional
Accepted 15 October 2019 hydrophobic resin layer.
Available online 4 November 2019 Methods: Flat dentin surfaces were prepared from twelve non-carious human molars and
were randomly divided into two groups. The universal adhesive system Scotchbond™ Uni-
Keywords: versal was used in self-etch mode (SBU) with and without the application of an extra hy-
Aging drophobic resin layer of Adper™ Scotchbond™ Multi-Purpose Plus (SBU+HL). After compos-
Dentin ite buildups, samples were stored in water (37ºC/7 days) and then sectioned into
2
Microtensile bond strength microspecimens (1.00±0.2 mm ). Half of the microspecimens were immediately subjected
Universal adhesives to microtensile bond strength testing (0.5 mm/min) while the other half was stored in water,
according to the ISO/TS 11405:2015, for 4 years before testing. Data were analyzed with
Kruskal Wallis and all-pairwise comparisons with Bonferroni corrections (p<0.05).
Results: The following microtensile bond strengths were registered (mean in MPa±SD): imme-
diate SBU, 52.5±13.56; 4-year SBU, 26.0±6.50; immediate SBU+HL, 59.3±12.39; 4-year SBU+HL,
32.5±5.72. No statistically significant differences were detected between adhesive strategies
either immediately or in the aged period (p>0.05). A significant decrease in bond strength was
verified between the immediate and the 4-year evaluation for both groups (p<0.05).
Conclusions: Water storage induced an approximately 50% reduction in dentin bond strength,
regardless of the adhesive strategy employed. The incorporation of an extra hydrophobic
layer over the universal adhesive did not improve dentin bond strength significantly either
immediately or after long-term water storage. (Rev Port Estomatol Med Dent Cir Maxilofac.
2019;60(3):96-103)
© 2019 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: avinagre@fmed.uc.pt (Alexandra Vinagre).
http://doi.org/10.24873/j.rpemd.2019.11.463
1646-2890/© 2019 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/).