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Bond Strength of High-Viscosity Glass Ionomer Cements is Affected by Tubular Density and Location in Dentin?

Published online by Cambridge University Press:  03 July 2015

Tamara K. Tedesco ,
Ana Flávia B. Calvo ,
Gabrielle G. Domingues ,
Fausto M. Mendes  and
Daniela P. Raggio
Tamara K. Tedesco
Affiliation:
Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of São Paulo, São Paulo 05508-000, Brazil
Ana Flávia B. Calvo
Affiliation:
Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of São Paulo, São Paulo 05508-000, Brazil
Gabrielle G. Domingues
Affiliation:
Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of São Paulo, São Paulo 05508-000, Brazil
Fausto M. Mendes
Affiliation:
Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of São Paulo, São Paulo 05508-000, Brazil
Daniela P. Raggio*
Affiliation:
Department of Orthodontics and Pediatric Dentistry, School of Dentistry, University of São Paulo, São Paulo 05508-000, Brazil
*
*Corresponding author. danielar@usp.br
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Abstract

This study evaluated the influence of tubular density of different dentin depths and location on the bond strength of high-viscosity glass ionomer cements (GIC). A total of 20 molars were selected and assigned into six experimental groups, considering two different high-viscosity GICs—Fuji IX (FIX) or Ketac Molar (KM), and dentin location—proximal, occlusal superficial, or occlusal deep dentin (n=10). Teeth were cut and a topographical analysis of four sections per group was performed to obtain data about the tubular density of each different dentin location and depths by laser scanning confocal microscopy (100×). Polyethylene tubes were placed over the pretreated surfaces and filled with one of the GICs. Microshear bond strength (µSBS) test was performed after storage in distilled water (24 h at 37°C). Failure modes were evaluated using a stereomicroscope (400×). Multilevel regression analysis was performed to compare the results at a significance level set at 5%. The tubule density was inversely proportional to the bond strength for both GICs (p<0.05). Adhesive/mixed failure prevailed in all experimental groups. Proximal (30036.5±3433.3) and occlusal superficial 29665.3±1434.04 dentin shows lower tubule density, resulting in a better GIC bonding performance (proximal: FIX–3.61±1.05; KM–3.40±1.62; occlusal superficial: FIX–4.70±1.85; KM–4.97±1.25). Thus, we can concluded that the lowest tubule density in proximal and occlusal superficial dentin results in a better GIC bond strength performance.

Keywords

glass ionomer cementsbond strengthdentinconfocal microscopypermanent tooth
Type
Biological Applications and Techniques
Information
Microscopy and Microanalysis , Volume 21 , Issue 4 , August 2015 , pp. 849 - 854
Copyright
© Microscopy Society of America 2015 

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