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Early Water Loss Characteristics of a New GIC Restorative Material

Objectives: To analyze the thermal (TGA+TMA) water loss characteristics of Ketac Universal (3M-ESPE)
Methods: Ketac Universal (KU) was prepared following manufacturer directions and placed into 100µl alumina DSC crucibles and stored (98% RH, 37C). H2O loss was assessed with a combined TGA/DSC unit over a 60m 37C isothermal scan. Samples (n=12) were tested immediately after mixing, at 24h, and 1w. Both Ketac Fil (KF) and Ketac Molar Quick (KMQ) were tested under the same conditions. Mean data was analyzed with Kruskal-Wallis/Dunn’s (p=0.05). Also, 2x4x5mm samples of each material (n=12) were fabricated and likewise previously stored. At 1w all were tested for linear dimensional change at both wet and dry conditions using TMA (37C for 1h). Mean data were analyzed with Mann-Whitney & Kruskal-Wallis/Dunn’s (p=0.05).
Results: The tables list the results. Under TGA, KU lost more H2O immediately than KF & KMQ but all were similar thereafter. Under wet conditions all materials had similar TMA results while KMQ demonstrated more %dry linear change than KU & KF.
Conclusions: KU had more initial H2O loss than KF & KMQ but was similar thereafter. KU largely demonstrated similar TMA behavior to KF and KMQ—of which protective varnish is recommended. Based on these initial thermal results, protecting KF with varnish may be prudent.
Division: AADR/CADR Annual Meeting
Meeting: 2018 AADR/CADR Annual Meeting (Fort Lauderdale, Florida)
Location: Fort Lauderdale, Florida
Year: 2018
Final Presentation ID: 1630
Abstract Category|Abstract Category(s): Dental Materials 2:Polymer-based Materials
Authors
  • Roberts, Howard  ( University of Kentucky College of Dentistry , Lexington , Kentucky , United States )
  • Brewster, John  ( USAF Postgraduate Dental School, Keesler AFB, MS , Keesler AFB , Mississippi , United States )
  • Berzins, David  ( Marquette University , Milwaukee , Wisconsin , United States )
    • Financial Interest Disclosure: NONE
    SESSION INFORMATION
    Poster Session
    Dental Materials: Polymer-based Materials IV
    Saturday, 03/24/2018 , 11:00AM - 12:15PM
    TABLES
    TGA H2O Loss(%)
    MaterialImmediate24 Hours1 Week
    KF1.17 (0.1) A2.6 (0.4) A3.14 (0.4) A
    KMQ1.07 (0.1) A2.63 (0.7) A2.76 (0.5) A
    KU1.42 (0.2) B3.2 (0.8) A 3.02 (1.0) A
    n = 12; Groups with same capital letter per column statistically similar (Kruskal-Wallis/Dunn's (p=0.05)
    TMA Linear Dimensional Change(%)
    MaterialWetDry
    KF-0.00513 (0.002) Aa-0.0620 (0.02) Ab
    KMQ-0.00856 (0.007) Aa-0.0943 (0.05) Bb
    KU-0.00754 (0.004) Aa-0.0344 (0.02) Ab
    n=12; Groups with same capital letter similar within each column (Dunn’s, p=0.05), small letters similar within each row (Mann-Whitney,p=0.05