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

作者：Tedesco Tamara K; Calvo Ana Flavia B; Domingues Gabrielle G; Mendes Fausto M; Raggio Daniela P^*

来源：Microscopy and Microanalysis, 2015, 21(4): 849-854.

DOI：10.1017/S1431927615013021

• glass ionomer cements
• bond strength
• dentin
• confocal microscopy
• permanent tooth

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 GICsFuji IX (FIX) or Ketac Molar (KM), and dentin locationproximal, 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 (100x). Polyethylene tubes were placed over the pretreated surfaces and filled with one of the GICs. Microshear bond strength (mu SBS) test was performed after storage in distilled water (24 h at 37 degrees C). Failure modes were evaluated using a stereomicroscope (400x). 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.

• 出版日期2015-8