The effect of surface treatments application on dentin permeability and shear bond strength of resin cement under simulated pulpal pressure condition
Main Article Content
Abstract
The objective was to evaluate the permeability reduction and bond strength after treated dentin with two surface treatment agents, Teethmate® (TDA) and Portland cement.
Sixty extracted teeth were divided equally into six groups; control, TDA and Portland cement groups with and without simulated 15 cmH2O pulpal pressure. Each surface treatment was randomly applied to dentin surface. Dentin permeability was evaluated for simulated pulpal pressure groups by recorded fluid droplets on dentin surface using replica technique. The replica was examined under SEM. The specimen was re-polished and re-applied same surface treatment. The composite rod was bonded to dentin with self-etched resin cement. The shear bond strength of bonding interface was tested with universal testing machine. Two-way ANOVA was tested for comparing treatment groups and pulpal pressure conditions with Tukey’s multiple comparisons.
Specimens with simulated pulpal pressure had significantly lower shear bond strength than without pulpal pressure (P<0.01). Surface treatment groups, TDA and Portland cement, showed significantly higher shear bond strength than control under simulated pulpal pressure condition (P<0.05). While no significant difference was seen in non-simulated pulpal pressure groups. SEM micrograph shown that both surface treatment groups had significant less permeability of dentin as smaller fluid droplets were recorded.
Dentin surface treatments had effectiveness on reduced dentin permeability and increased shear bond strength of dental adhesive in simulated pulpal pressure condition. But there had no advantage over a control group for non-simulated pulpal pressure condition.
Article Details
References
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