Effects of six different preventive treatments on the shear bond strength of orthodontic brackets: study.

Authors:
Dr Valentina Lanteri, DDS, MS, PhD
Dr Valentina Lanteri, DDS, MS, PhD
University of Milano Department of Biomedical, Surgical and Dental Sciences, Unit of Orthodontics and Pediatric Dentistry School of Dentistry
Post Doc Researcher
Orthodontics, Paediatric Dentistry
Milano | Italy

Acta Biomater Odontol Scand 2015 Jan 14;1(1):13-17. Epub 2015 Apr 14.

Fondazione IRCCS Cà Granda Ospedale Maggiore Policlinico, Department of Biomedical, Surgical and Dental Sciences, Unit of Orthodontics and Pediatric Dentistry, School of Dentistry, University of MilanMilanItaly.

: The aim of this study is to evaluate the effect of six different prophylactic agents on shear bond strength (SBS) of orthodontic brackets. : One hundred twenty-six freshly extracted mandibular bovine incisors were used. Teeth were randomly divided into 7 equal groups (18 per group) as follows: group-1 served as control with no pre-treatment; group-2 enamel treated with fluoride varnish (Fluor Protector, Ivoclar Vivadent); group-3 containing casein-phosphopeptide-amorphous calcium-phosphate (CPP-ACP) paste (GC Tooth Mousse, RECALDENT™); group-4 with ozone (HealOzone, Kavo; group-5 with glycine powder (Perio Flow, EMS); group-6 with hydroxyapatite powder 99.5% (Coswell S.p.A.); group-7 with a toothpaste made of hydroxyapatite nanocrystals (BioRepair® Plus, Coswell S.p.A). Brackets were all bonded using the same technique with transbond XT (3 M Unitek, Monrovia, CA). All the bonded specimens were stored for 24 h in deionized water (37 °C) and subjected to thermal cycling for 1000 cycles. The SBS was measured with an Instron Universal Testing machine and the adhesive remnant was assessed with the adhesive remnant index (ARI) using a stereomicroscope at 10× magnification. : Statistical differences (ANOVA) were found among the seven investigated groups ( = 12.226, 0.001). SBS of groups 2, 5 and 6 were significantly lower than the control group ( < 0.05). ARI scores (chi-square test) were correlated with the differences of SBS values. CPP-ACP paste, ozone or BioRepair® did not compromise on bracket bond strength. Fluoride, glycine or hydroxyapatite significantly decreased the SBS; only the fluoride group showed significant clinically low (<6 MPa) SBS values.

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Source
http://www.tandfonline.com/doi/full/10.3109/23337931.2015.10
Publisher Site
http://dx.doi.org/10.3109/23337931.2015.1021351DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5433176PMC
January 2015
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