ผลของการลดการซึมผ่านของของเหลวโดยใช้สารลดการเสียวฟัน และพอร์ตแลนด์ซีเมนต์ต่อความแข็งแรงยึดเฉือนระหว่างเรซินซีเมนต์กับเนื้อฟัน

Abstract

The objective of this study was to evaluate the effect of surface treatments application of exposed dentin with Teethmate (TDA) and Portland cement on dentin permeability and shear bond strength of resin cement under simulated pulpal pressure condition in extracted human teeth. 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 with the same surface treatment. The composite rod was bonded to dentin with self-etched resin cement. The shear bond strength was tested. The data were analyzed using Two-way ANOVA and 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 showed that both surface treatment groups had significantly less permeability of dentin as smaller fluid droplets were recorded. Dentin surface treatments effectively reduced dentin permeability and increased shear bond strength of resin cement in simulated pulpal pressure condition. But there were no advantages over the control group for non-simulated pulpal pressure condition.