Page 42 - SPEMD_60-3

Revista Portuguesa de Estomatologia,
Medicina Dentária e Cirurgia Maxilofacial

rev port estomatol med dent cir maxilofac. 2019;60(3):130-136

Original research

Effect of surface treatment and the use of
mouthwashes on repaired composite bond strength

b
b,
a
a
Inês Pinheiro , Gonçalo Barragan , Ana Filipa Chasqueira *, Sofia Arantes-Oliveira ,
Jaime Portugal b
a Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal
b Oral and Biomedical Sciences Research Unit (UICOB), Faculdade de Medicina Dentária, Universidade de Lisboa, Lisbon, Portugal

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

Article history: Objectives: The purpose of this study was to evaluate the effect of mouthwashes on com-
Received 22 July 2019 posite Knoop microhardness, and to assess the influence of the contact with mouthwashes
Accepted 21 October 2019 and mechanical surface treatment on the shear bond strength of repaired composite resins.
Available online 4 November 2019 Methods: One hundred twenty composite resin (GrandioSO) specimens were prepared and
randomly divided into four experimental groups, according to the used mouthwash (distilled
Keywords: water; Listerine Teeth & Gum; Eludril Perio; Lacer Oros). After a period of 5 days in water
Bond strength (37ºC), during which the specimens were submitted to twelve cycles of 2 hours of immersion
Composite resin in the respective mouthwash, the Knoop microhardness was determined. Then, each group
Microhardness was divided into three subgroups based on the mechanical surface treatment performed
Mouthwashes (no treatment; 50-µm Al2O3 sandblasting; abrasion with diamond bur), the repair protocol
Repair was performed (Solobond M and GansdioSO) and specimens were submitted to shear bond
strength tests until failure. Data were analyzed using ANOVA followed by Student-New-
man-Keuls post-hoc tests (α=0.05).
Results: The group of specimens aged in distilled water presented a significantly harder
surface than the other experimental groups (p<0.05). No statistically significant differences
were found (p>0.05) between other groups. Neither the immersion media (p=0.214) nor the
mechanical surface treatments (p=0.165) had a significant effect on the bond strength.
Conclusions: Although the hardness of the composite was negatively affected by contact
with the mouthwashes used in this study, the bond strength of composite repair was not
affected. (Rev Port Estomatol Med Dent Cir Maxilofac. 2019;60(3):130-136)
© 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: filipach@gmail.com (Ana Filipa Chasqueira).
http://doi.org/10.24873/j.rpemd.2019.11.462
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/).