Title: 0709 - Novel Method for Water Uptake Measurements of Different Luting Cements
Afshin Falsafi (Presenter)
Tiffany Ton, 3M
Anneka Ecker, 3M
Objectives: Induction of Dentinal Fluid Flow (DFF) is critical to dental restoratives and their potential to illicit tooth-sensitivity due to their water-uptake characteristics. While the ISO 4049 water-uptake test method has been successfully employed for resin-based (water-free) systems, such quantification has been challenging and meaningless for water-based materials in view of their intrinsic water content. Additionally, direct measurements of induced DFF (Pashley Test) has been historically impacted by the sample-to-sample variability of dentin structure. In this study, a range of different luting cements with varying chemistries have been characterized in terms of their water-uptake potentials and flow flux profiles upon immediate contact with a porous substrate. This study investigated several water-based luting cements including a novel experimental temporary cement (EXPTC, 3M), Fuji Temp LT (FTLT, conventional GI, GC), RelyX Luting Plus (RLP, RMGI, 3M), FujiCEM2 (FC2, RMGI, GC), Fuji I (F1, conventional GI, GC), and resin-based cements including Tempbond NE (TBNE, non-eugenol, Kerr) and RelyX Veneer (RV, resin, 3M).
Methods: Modified Pashley test was conducted using a capillary tube (ID=1 mm), a water head of 20 cm, and a pre-sintered Lava Plus zirconia disc as the dentin replacement. A pre-test flow flux was established and recorded using an air bubble in the capillary. The cements were used according to manufacturers’ directions and dispensed at time zero directly into a metal mold sitting on the zirconia disc. Bubble movements were recorded with time to calculate water flow flux.
Results: Responses were analyzed for each cement and early flow flux values were calculated and summarized in table below.
Conclusions: ANOVA analysis was performed at p < 0.05 per Tukey’s pairwise comparison test. Generally, resin-based cements showed significantly lower potential for water-uptake compared to water-based ones. The experimental temporary cement demonstrated an early water-uptake in the range of GI and RMGI’s. Among RMGI’s, RLP had significantly lower early uptake compared to FC2.
|Material||Chemistry||Early Water Flow Flux (micro L/cm2/min)||Grouping|
The submitter must disclose the names of the organizations with which any author have a relationship, the nature of the relationship, and the clinical or research area involved. The following is submitted: I am an employee of 3M.