Bond strength of high-viscosity glass ionomer cements is affected by tubular density and location in dentin?

Tedesco, Tamara K., Calvo, Ana Flavia B., Domingues, Gabrielle G., Mendes, Fausto M. and Raggio, Daniela P. ORCID: https://orcid.org/0000-0002-0048-2068 2015. Bond strength of high-viscosity glass ionomer cements is affected by tubular density and location in dentin? Microscopy and Microanalysis 21 (4) , pp. 849-854. 10.1017/S1431927615013021

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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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Dentistry
Publisher:	Cambridge University Press
ISSN:	1431-9276
Last Modified:	10 Nov 2022 10:57
URI:	https://orca.cardiff.ac.uk/id/eprint/148800

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